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Artículos de revistas sobre el tema "Semiconducting Quantum Materials"

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Autor: Grafiati
Publicado: 7 de septiembre de 2023

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1

Zhang, Dao Hua. "Semiconducting Materials for Photonic Technology". Materials Science Forum 859 (mayo de 2016): 96–103. http://dx.doi.org/10.4028/www.scientific.net/msf.859.96.

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Semiconducting materials are important photonic materials and the technologies developed have been utilized in many fields of the modern society and they are closely related to the quality of our life. The main applications of the materials are for light source and sensing originated from interaction of photons and matters. In this invited talk, I will first present our work on the properties of the semiconducting materials and their applications as lasers and photodetectors, and then present integrated hybrid subwavelength structures which show significant enhancement on device performance. It is believed that complex hybrid structures which combine quantum-and hetero-structures made of semiconducting materials, and subwavelength structure for performance enhancement are the main focus in the near future.
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2

Cocchi, Caterina y Holger-Dietrich Saßnick. "Ab Initio Quantum-Mechanical Predictions of Semiconducting Photocathode Materials". Micromachines 12, n.º 9 (24 de agosto de 2021): 1002. http://dx.doi.org/10.3390/mi12091002.

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Ab initio Quantum-Mechanical methods are well-established tools for material characterization and discovery in many technological areas. Recently, state-of-the-art approaches based on density-functional theory and many-body perturbation theory were successfully applied to semiconducting alkali antimonides and tellurides, which are currently employed as photocathodes in particle accelerator facilities. The results of these studies have unveiled the potential of ab initio methods to complement experimental and technical efforts for the development of new, more efficient materials for vacuum electron sources. Concomitantly, these findings have revealed the need for theory to go beyond the status quo in order to face the challenges of modeling such complex systems and their properties in operando conditions. In this review, we summarize recent progress in the application of ab initio many-body methods to investigate photocathode materials, analyzing the merits and the limitations of the standard approaches with respect to the confronted scientific questions. In particular, we emphasize the necessary trade-off between computational accuracy and feasibility that is intrinsic to these studies, and propose possible routes to optimize it. We finally discuss novel schemes for computationally-aided material discovery that are suitable for the development of ultra-bright electron sources toward the incoming era of artificial intelligence.
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3

Banerjee, Pritam, Chiranjit Roy, Juan Jesús Jiménez, Francisco Miguel Morales y Somnath Bhattacharyya. "Atomically resolved 3D structural reconstruction of small quantum dots". Nanoscale 13, n.º 16 (2021): 7550–57. http://dx.doi.org/10.1039/d1nr00466b.

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4

Zentel, Rudolf. "Polymer Coated Semiconducting Nanoparticles for Hybrid Materials". Inorganics 8, n.º 3 (11 de marzo de 2020): 20. http://dx.doi.org/10.3390/inorganics8030020.

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This paper reviews synthetic concepts for the functionalization of various inorganic nanoparticles with a shell consisting of organic polymers and possible applications of the resulting hybrid materials. A polymer coating can make inorganic nanoparticles soluble in many solvents as individual particles and not only do low molar mass solvents become suitable, but also polymers as a solid matrix. In the case of shape anisotropic particles (e.g., rods) a spontaneous self-organization (parallel orientation) of the nanoparticles can be achieved, because of the formation of lyotropic liquid crystalline phases. They offer the possibility to orient the shape of anisotropic nanoparticles macroscopically in external electric fields. At least, such hybrid materials allow semiconducting inorganic nanoparticles to be dispersed in functional polymer matrices, like films of semiconducting polymers. Thereby, the inorganic nanoparticles can be electrically connected and addressed by the polymer matrix. This allows LEDs to be prepared with highly fluorescent inorganic nanoparticles (quantum dots) as chromophores. Recent works have aimed to further improve these fascinating light emitting materials.
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5

Mokkath, Junais Habeeb. "Dopant-induced localized light absorption in CsPbX3 (X = Cl, Br, I) perovskite quantum dots". New Journal of Chemistry 43, n.º 46 (2019): 18268–76. http://dx.doi.org/10.1039/c9nj03784e.

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6

Reichardt, Sven y Ludger Wirtz. "Nonadiabatic exciton-phonon coupling in Raman spectroscopy of layered materials". Science Advances 6, n.º 32 (agosto de 2020): eabb5915. http://dx.doi.org/10.1126/sciadv.abb5915.

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We present an ab initio computational approach for the calculation of resonant Raman intensities, including both excitonic and nonadiabatic effects. Our diagrammatic approach, which we apply to two prototype, semiconducting layered materials, allows a detailed analysis of the impact of phonon-mediated exciton-exciton scattering on the intensities. In the case of bulk hexagonal boron nitride, this scattering leads to strong quantum interference between different excitonic resonances, strongly redistributing oscillator strength with respect to optical absorption spectra. In the case of MoS2, we observe that quantum interference effects are suppressed by the spin-orbit splitting of the excitons.
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7

Liang, Shuang, Ze Ma, Nan Wei, Huaping Liu, Sheng Wang y Lian-Mao Peng. "Solid state carbon nanotube device for controllable trion electroluminescence emission". Nanoscale 8, n.º 12 (2016): 6761–69. http://dx.doi.org/10.1039/c5nr07468a.

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Semiconducting carbon nanotubes (CNTs) have a direct chirality-dependent bandgap and reduced dimensionality-related quantum confinement effects, which are closely related to the performance of optoelectronic devices.
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8

Banks, Peter A., Jefferson Maul, Mark T. Mancini, Adam C. Whalley, Alessandro Erba y Michael T. Ruggiero. "Thermoelasticity in organic semiconductors determined with terahertz spectroscopy and quantum quasi-harmonic simulations". Journal of Materials Chemistry C 8, n.º 31 (2020): 10917–25. http://dx.doi.org/10.1039/d0tc01676d.

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The thermomechanical response of organic semiconducting solids – an essential aspect to consider for the design of flexible electronics – was determined using terahertz vibrational spectroscopy and quantum quasiharmonic approximation simulations.
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9

Feng, Hao-Lin, Wu-Qiang Wu, Hua-Shang Rao, Long-Bin Li, Dai-Bin Kuang y Cheng-Yong Su. "Three-dimensional hyperbranched TiO2/ZnO heterostructured arrays for efficient quantum dot-sensitized solar cells". Journal of Materials Chemistry A 3, n.º 28 (2015): 14826–32. http://dx.doi.org/10.1039/c5ta02269j.

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10

KIM, Jaewook. "Advances in Floating Zone Crystal Growth". Physics and High Technology 31, n.º 9 (30 de septiembre de 2022): 22–25. http://dx.doi.org/10.3938/phit.31.030.

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Optical floating zone (OFZ) method has been applied to grow various materials for semiconducting industry applications as well as basic research on quantum materials. This article describes the OFZ method in detail and briefly introduces two recent advances in floating zone method by incorporating new techniques, namely, laser diode as optical source and high pressure environments. These developments have made it possible to grow materials that were previously challenging in conventional OFZ method and greatly expanded the range of accessible systems to search for exotic quantum phenomena.
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11

Suzuki, Katsuaki y Hironori Kaji. "(Invited) Structural Analysis of Organic Semiconducting Materials By Solid State NMR". ECS Meeting Abstracts MA2022-01, n.º 13 (7 de julio de 2022): 910. http://dx.doi.org/10.1149/ma2022-0113910mtgabs.

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Recently, our group have successfully developed several blue and green thermally activated delayed fluorescence (TADF) emitters showing high external quantum efficiencies in OLEDs through high-throughput screening based on quantum chemical calculations. Although a number of highly efficient TADF emitters have been reported, the study about their conformation and aggregated structure in an amorphous states, which is expected to be the origin of high device performance, is still limited. Thus we have carried out multiscale simulations and solid-state NMR (ssNMR) analysis of organic amorphous thin films. The ssNMR is one of the powerful technique to acquire the structural information of amorphous aggregated materials, which has been difficult by diffraction techniques due to the lack of long range order for amorphous state. In this presentation, we demonstrate ssNMR analysis of amorphous organic semiconducting materials. Reference (1) “Analysis of Molecular Orientation in Organic Semiconducting Thin Films Using Static Dynamic Nuclear Polarization Enhanced Solid-State NMR Spectroscopy”, Suzuki, K.; Kubo, S.; Aussenac, F.; Engelke, F.; Fukushima, T.; Kaji, H. Angew. Chem. Int. Ed. 2017, 56, 14842. (2) “Efficient blue thermally activated delayed fluorescence emitters showing very fast reverse intersystem crossing”, Ren, Y., Wada, Y., Suzuki, K., Kusakabe, Y., Geldsetzer, J. and Kaji, H. Appl. Phys. Express, 2021, 14, 071003. (3) “Solution-processable thermally activated delayed fluorescence emitters for application in organic light emitting diodes”, Suzuki, K.; Adachi, C.; Kaji, H. J. Soc. Inf. Disp. 2017, 25, 480. (4) “Combined Inter- and Intramolecular Charge-Transfer Processes for Highly Efficient Fluorescent Organic Light-Emitting Diodes with Reduced Triplet Exciton Quenching”, Moon, C.-K.; Suzuki, K.; Shizu, K.; Adachi, C.; Kaji, H.; Kim, J.-J. Adv. Mater. 2017, 131, 6614. (5) “Triarylboron-based Fluorescent Organic Light-emitting Diodes with External Quantum Efficiencies Exceeding 20%”, Suzuki, K.; Kubo, S.; Shizu, K.; Fukushima, T.; Wakamiya, A.; Murata, Y.; Adachi, C.; Kaji, H.; Angew. Chem. Int. Ed. 2015, 54, 15231. (5) “Purely organic electroluminescent material realizing 100% conversion from electricity to light”, Kaji, H.; Suzuki, H.; Fukushima, T.; Shizu, K.; Suzuki, K.; Kubo, S.; Komino, T.; Oiwa, H.; Suzuki, F.; Wakamiya, A.; Murata, Y.; Adachi, C. Nat. Commun. 2015, 6, 8476.
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12

Zhou, Qi, Junfang Yang, Mingxu Du, Xiaobo Yu, Cheng Li, Xi-Sha Zhang, Qian Peng, Guanxin Zhang y Deqing Zhang. "New near-infrared absorbing conjugated electron donor–acceptor molecules with a fused tetrathiafulvalene–naphthalene diimide framework". Journal of Materials Chemistry C 10, n.º 7 (2022): 2814–20. http://dx.doi.org/10.1039/d1tc04291b.

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13

Mo, Daize, Zhe Chen, Liang Han, Hanjian Lai, Pengjie Chao, Qingwen Zhang, Leilei Tian y Feng He. "Highly stable and bright fluorescent chlorinated polymer dots for cellular imaging". New Journal of Chemistry 43, n.º 6 (2019): 2540–49. http://dx.doi.org/10.1039/c8nj05671d.

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14

Pejova, Biljana, Atanas Tanuševski y Ivan Grozdanov. "Semiconducting thin films of zinc selenide quantum dots". Journal of Solid State Chemistry 177, n.º 12 (diciembre de 2004): 4785–99. http://dx.doi.org/10.1016/j.jssc.2004.06.011.

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15

CATTANI, M., M. C. SALVADORI y J. M. FILARDO BASSALO. "SURFACE-INDUCED ELECTRICAL RESISTIVITY OF CONDUCTING THIN FILMS". Surface Review and Letters 12, n.º 02 (abril de 2005): 221–26. http://dx.doi.org/10.1142/s0218625x05006974.

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A quantum approach is proposed to calculate the surface-induced electrical resistivity of metallic and semiconducting thin films when several subbands of Fermi participate of the electronic transport. The application of this approach to explain the experimental resistivity data of Pt and Au thin films is briefly reported. The surface-induced resistivity is calculated in detail for the particular case of semiconducting films with only one subband.
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16

Yin, Feng, Kuan Hu, Si Chen, Dongyuan Wang, Jianing Zhang, Mingsheng Xie, Dan Yang, Meng Qiu, Han Zhang y Zi-gang Li. "Black phosphorus quantum dot based novel siRNA delivery systems in human pluripotent teratoma PA-1 cells". Journal of Materials Chemistry B 5, n.º 27 (2017): 5433–40. http://dx.doi.org/10.1039/c7tb01068k.

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As a novel semiconducting materials, BP-QDs possess superior transfection efficiency, excellent biocompatibility and low cytotoxicity, which shows promising potential for siRNA delivery and photothermal effects in cancer therapy.
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17

James Singh, Konthoujam, Tanveer Ahmed, Prakalp Gautam, Annada Sankar Sadhu, Der-Hsien Lien, Shih-Chen Chen, Yu-Lun Chueh y Hao-Chung Kuo. "Recent Advances in Two-Dimensional Quantum Dots and Their Applications". Nanomaterials 11, n.º 6 (11 de junio de 2021): 1549. http://dx.doi.org/10.3390/nano11061549.

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Two-dimensional quantum dots have received a lot of attention in recent years due to their fascinating properties and widespread applications in sensors, batteries, white light-emitting diodes, photodetectors, phototransistors, etc. Atomically thin two-dimensional quantum dots derived from graphene, layered transition metal dichalcogenide, and phosphorene have sparked researchers’ interest with their unique optical and electronic properties, such as a tunable energy bandgap, efficient electronic transport, and semiconducting characteristics. In this review, we provide in-depth analysis of the characteristics of two-dimensional quantum dots materials, their synthesis methods, and opportunities and challenges for novel device applications. This analysis will serve as a tipping point for learning about the recent breakthroughs in two-dimensional quantum dots and motivate more scientists and engineers to grasp two-dimensional quantum dots materials by incorporating them into a variety of electrical and optical fields.
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18

Kausar, Ayesha. "Polyaniline and quantum dot-based nanostructures: Developments and perspectives". Journal of Plastic Film & Sheeting 36, n.º 4 (14 de mayo de 2020): 430–47. http://dx.doi.org/10.1177/8756087920926649.

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Quantum dots are 2–5 nm nanoparticles with exceptional optical, electronic, luminescence, and semiconducting properties. Polyaniline is an exclusive conjugated polymer. This article reviews recent efforts, scientific trials, and technological solicitations of the polyaniline/quantum dot-based nanocomposites. Polyaniline/quantum dot mixtures form a unique composition for advance materials and applications. Carbon dots, graphene quantum dots, and several inorganic quantum dots have been added to a conducting polymer. A functional quantum dot may develop electrostatic, van der Waal, and π–π stacking interactions with the conjugated polymer backbone. Uniform quantum dot dispersion in polyaniline may result in inimitable morphology, electrical conductivity, electrochemical properties, capacitance, and sensing features. Finally, this review expounds on the many applications for polyaniline/quantum dot nanocomposites including dye-sensitized solar cell, supercapacitor, electronics, gas sensor, biosensor, and bioimaging.
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19

Krowne, C. M. "Nanowire and Nanocable Intrinsic Quantum Capacitances and Junction Capacitances: Results for Metal and Semiconducting Oxides". Journal of Nanomaterials 2010 (2010): 1–27. http://dx.doi.org/10.1155/2010/160639.

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Here we calculate the intrinsic quantum capacitance of RuO2nanowires and RuO2/SiO2nanocables (filled interiors of nanotubes, which are empty), based upon available ab initio density of states values, and their conductances allowing determination of transmission coefficients. It is seen that intrinsic quantum capacitance values occur in the aF range. Next, expressions are derived for Schottky junction andp-njunction capacitances of nanowires and nanocables. Evaluation of these expressions for RuO2nanowires and RuO2/SiO2nanocables demonstrates that junction capacitance values also occur in the aF range. Comparisons are made between the intrinsic quantum and junction capacitances of RuO2nanowires and RuO2/SiO2nanocables, and between them and intrinsic quantum and junction capacitances of carbon nanotubes. We find that the intrinsic quantum capacitance of RuO2-based nanostructures dominates over its junction capacitances by an order of magnitude or more, having important implications for energy and charge storage.
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20

Yi, Guangyu, Guozhu Wei y Haina Wu. "Transverse Stark effect in a rectangular semiconducting quantum wire". physica status solidi (b) 244, n.º 12 (diciembre de 2007): 4651–59. http://dx.doi.org/10.1002/pssb.200743045.

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21

Kumar, Pushpendra y Kedar Singh. "Ferromagnetism in Cu-doped ZnSe semiconducting quantum dots". Journal of Nanoparticle Research 13, n.º 4 (7 de abril de 2010): 1613–20. http://dx.doi.org/10.1007/s11051-010-9914-5.

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22

Portney, Nathaniel G., Alfredo A. Martinez-Morales y Mihrimah Ozkan. "Nanoscale Memory Characterization of Virus-Templated Semiconducting Quantum Dots". ACS Nano 2, n.º 2 (10 de enero de 2008): 191–96. http://dx.doi.org/10.1021/nn700240z.

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23

Kshirsagar, Anjali y Neelesh Kumbhojkar. "Empirical pseudo-potential studies on electronic structure of semiconducting quantum dots". Bulletin of Materials Science 31, n.º 3 (junio de 2008): 297–307. http://dx.doi.org/10.1007/s12034-008-0048-7.

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24

KNOLL, WOLFGANG, MING-YONG HAN, XINHENG LI, JOSE-LUIS HERNANDEZ-LOPEZ, ABHIJIT MANNA, KLAUS MÜLLEN, FUMIO NAKAMURA et al. "NANOSCOPIC BUILDING BLOCKS FROM POLYMERS, METALS, AND SEMICONDUCTORS FOR HYBRID ARCHITECTURES". Journal of Nonlinear Optical Physics & Materials 13, n.º 02 (junio de 2004): 229–41. http://dx.doi.org/10.1142/s0218863504001815.

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This paper describes some of our efforts in the area of nanostructured thin film architectures. The resulting interfacial hybrid assemblies are built from (1) organic/polymeric objects based on dendrimer systems, from (2) surface-functionalized Au nanoparticles, and (3) from a variety of semiconducting quantum dots. Dendrimers as polymeric building blocks with a strictly monodisperse particle size distribution in the nanometer range can be functionalized in the core, the scaffold, or at the periphery, thus offering interesting hybrid materials for a wide range of applications. The combination with Au clusters and their local surface plasmon resonances suggests new strategies for optoelectronic devices or unconventional bio-sensor platforms. The possibility of tuning the luminescent properties of semiconducting nanoparticles by size or compositional bandgap engineering complements the assembly kit with building blocks for supramolecular thin film nanocomposite materials.
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25

Liu, Chang, Xianqi Song, Quan Li, Yanming Ma y Changfeng Chen. "Superconductivity in Shear Strained Semiconductors". Chinese Physics Letters 38, n.º 8 (1 de septiembre de 2021): 086301. http://dx.doi.org/10.1088/0256-307x/38/8/086301.

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Semiconductivity and superconductivity are remarkable quantum phenomena that have immense impact on science and technology, and materials that can be tuned, usually by pressure or doping, to host both types of quantum states are of great fundamental and practical significance. Here we show by first-principles calculations a distinct route for tuning semiconductors into superconductors by diverse large-range elastic shear strains, as demonstrated in exemplary cases of silicon and silicon carbide. Analysis of strain driven evolution of bonding structure, electronic states, lattice vibration, and electron-phonon coupling unveils robust pervading deformation induced mechanisms auspicious for modulating semiconducting and superconducting states under versatile material conditions. This finding opens vast untapped structural configurations for rational exploration of tunable emergence and transition of these intricate quantum phenomena in a broad range of materials.
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26

Ham, Heon y Harold N. Spector. "Stark effect of electrons in a semiconducting quantum disk". Physica B: Condensed Matter 381, n.º 1-2 (mayo de 2006): 53–56. http://dx.doi.org/10.1016/j.physb.2005.12.252.

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27

Redko, N. A., V. D. Kagan y M. P. Volkov. "Quantum-limit anisotropic magnetoresistance of semiconducting n-BiSb alloys". Physica B: Condensed Matter 404, n.º 23-24 (diciembre de 2009): 5196–99. http://dx.doi.org/10.1016/j.physb.2009.08.320.

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28

Romanova, K. A. y Yu G. Galyametdinov. "Quantum-Chemical Simulation of Optical Functional Materials Based on Semiconducting Quantum Dots CdSe/CdS and Liquid-Crystalline Polymers". Liquid Crystals and their Application 20, n.º 2 (30 de junio de 2020): 76–84. http://dx.doi.org/10.18083/lcappl.2020.2.76.

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29

Gérard, Valérie A., Mark Freeley, Eric Defrancq, Anatoly V. Fedorov y Yurii K. Gun’ko. "Optical Properties andIn VitroBiological Studies of Oligonucleotide-Modified Quantum Dots". Journal of Nanomaterials 2013 (2013): 1–10. http://dx.doi.org/10.1155/2013/463951.

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Water-soluble semiconducting nanocrystals or quantum dots (QDs) have attracted much interest in recent years due to their tuneable emission and potential applications in photonics and biological imaging. Fluorescence resonance energy transfer (FRET) processes are very important for elucidating biochemical mechanismsin vitro, and QDs constitute an excellent substrate for this purpose. In this work, new oligonucleotide-functionalised CdTe-based QDs were prepared, characterised and biologically tested. These QDs demonstrated interesting optical properties as well as remarkablein vitrobehaviour and potential for a range of biological applications.
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30

Grado-Caffaro, M. A. y M. Grado-Caffaro. "Electrons as harmonic oscillators in degenerate semiconducting quantum dots". Optik 119, n.º 7 (mayo de 2008): 349–50. http://dx.doi.org/10.1016/j.ijleo.2007.02.001.

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31

Patel, Ghanshyam, Madan Singh y Tushar Pandya. "Effect of Size and Shape on Refractive Index, Dielectric Constant and Band Gap of Semiconducting Nanowire". Nanoscience & Nanotechnology-Asia 10, n.º 3 (17 de junio de 2020): 279–85. http://dx.doi.org/10.2174/2210681209666181212154219.

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Background: On decreasing size down to nanoscale, the optical and electronics properties of semiconductors become tunable instead of being constant. Methods: Based on classical and quantum approach, a simple integrated theoretical model is presented without any adjustable parameter to study the size and shape effect on the refractive index, dielectric constant and bang gap of the semiconducting nanowire. The model predicts that with the decrease in the size of the semiconducting nanowire, dielectric constant and refractive index reduces, whereas as band gap enhances. Results: The theory reveals that the behavior exhibited by cylindrical and noncylindrical nanowires differs due to their different shape factors. Conclusion: Agreement of our predicted results with the available experimental and simulated results and with the other theoretical models validates the present work.
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32

Vázquez, G. J., M. del Castillo-Mussot y Harold N. Spector. "Transverse Stark effect of electrons in a semiconducting quantum wire". physica status solidi (b) 240, n.º 3 (diciembre de 2003): 561–64. http://dx.doi.org/10.1002/pssb.200301865.

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33

Miller-Link, Elisa. "(Invited) Controlling and Using Optoelectronic Properties of MoS2 and WS2 Monolayers". ECS Meeting Abstracts MA2022-01, n.º 12 (7 de julio de 2022): 863. http://dx.doi.org/10.1149/ma2022-0112863mtgabs.

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Transition metal dichalcogenides (TMDCs) are an important class of materials because they can be reduced to 2D, where their quantum confined properties are easily manipulated for various applications. MoS2 is one of the most heavily studied TMDCs and is thermodynamically stable in the semiconducting 2H state. However, these monolayers are more catalytically active and have greater electron conductivity in the unstable, metallic (1T/1T’) state. Recently, we have demonstrated how to control the optoelectronic properties of MoS2 monolayers using n-butyl lithium immersion treatments and functional groups, where shorter treatment times heavily n-type dope MoS2 and longer treatment times fully convert the MoS2 from the semiconducting to metallic (1T/1T’) phase. By adding functional groups, the doped/converted MoS2 is stable for up to two weeks. In addition to MoS2, we have also explored how monolayers of semiconducting WS2 can be used as a contactless humidity sensor via photoluminescence. In this presentation, we will discuss the ways in which MoS2 and WS2 can be tuned for various optoelectronic properties.
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34

Limwongse, Teeravat, Supachok Thainoi, Somsak Panyakeow y Songphol Kanjanachuchai. "InGaAs Quantum Dots on Cross-Hatch Patterns as a Host for Diluted Magnetic Semiconductor Medium". Journal of Nanomaterials 2013 (2013): 1–5. http://dx.doi.org/10.1155/2013/791782.

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Storage density on magnetic medium is increasing at an exponential rate. The magnetic region that stores one bit of information is correspondingly decreasing in size and will ultimately reach quantum dimensions. Magnetic quantum dots (QDs) can be grown using semiconductor as a host and magnetic constituents added to give them magnetic properties. Our results show how molecular beam epitaxy and, particularly, lattice-mismatched heteroepitaxy can be used to form laterally aligned, high-density semiconducting host in a single growth run without any use of lithography or etching. Representative results of how semiconductor QD hosts arrange themselves on various stripes and cross-hatch patterns are reported.
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35

Stuchlikova, Lubica, Beata Sciana, Arpad Kosa, Matej Matus, Peter Benko, Juraj Marek, Martin Donoval, Wojciech Dawidowski, Damian Radziewicz y Martin Weis. "Evaluation of Effective Mass in InGaAsN/GaAs Quantum Wells Using Transient Spectroscopy". Materials 15, n.º 21 (30 de octubre de 2022): 7621. http://dx.doi.org/10.3390/ma15217621.

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Transient spectroscopies are sensitive to charge carriers released from trapping centres in semiconducting devices. Even though these spectroscopies are mostly applied to reveal defects causing states that are localised in the energy gap, these methods also sense-charge from quantum wells in heterostructures. However, proper evaluation of material response to external stimuli requires knowledge of material properties such as electron effective mass in complex structures. Here we propose a method for precise evaluation of effective mass in quantum well heterostructures. The infinite well model is successfully applied to the InGaAsN/GaAs quantum well structure and used to evaluate electron effective mass in the conduction and valence bands. The effective mass m/m0 of charges from the conduction band was 0.093 ± 0.006, while the charges from the conduction band exhibited an effective mass of 0.122 ± 0.018.
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36

Zhang, Binglei, Yi Luo, Yang Liu, Valerii N. Trukhin, Ilia A. Mustafin, Prokhor A. Alekseev, Bogdan R. Borodin et al. "Photon Drag Currents and Terahertz Generation in α-Sn/Ge Quantum Wells". Nanomaterials 12, n.º 17 (23 de agosto de 2022): 2892. http://dx.doi.org/10.3390/nano12172892.

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We have fabricated α-Sn/Ge quantum well heterostructures by sandwiching nano-films of α-Sn between Ge nanolayers. The samples were grown via e-beam deposition and characterized by Raman spectroscopy, atomic force microscopy, temperature dependence of electrical resistivity and THz time-resolved spectroscopy. We have established the presence of α-Sn phase in the polycrystalline layers together with a high electron mobility μ = 2500 ± 100 cm2 V−1 s−1. Here, the temperature behavior of the resistivity in a magnetic field is distinct from the semiconducting films and three-dimensional Dirac semimetals, which is consistent with the presence of linear two-dimensional electronic dispersion arising from the mutually inverted band structure at the α-Sn/Ge interface. As a result, the α-Sn/Ge interfaces of the quantum wells have topologically non-trivial electronic states. From THz time-resolved spectroscopy, we have discovered unusual photocurrent and THz radiation generation. The mechanisms for this process are significantly different from ambipolar diffusion currents that are responsible for THz generation in semiconducting thin films, e.g., Ge. Moreover, the THz generation in α-Sn/Ge quantum wells is almost an order of magnitude greater than that found in Ge. The substantial strength of the THz radiation emission and its polarization dependence may be explained by the photon drag current. The large amplitude of this current is a clear signature of the formation of conducting channels with high electron mobility, which are topologically protected.
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37

Ibragimov, G. B. "Free-carrier absorption in semiconducting quantum wells for alloy-disorder scattering". Journal of Physics: Condensed Matter 14, n.º 19 (2 de mayo de 2002): 4977–83. http://dx.doi.org/10.1088/0953-8984/14/19/319.

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38

Liu, He, Daniel Grasseschi, Akhil Dodda, Kazunori Fujisawa, David Olson, Ethan Kahn, Fu Zhang et al. "Spontaneous chemical functionalization via coordination of Au single atoms on monolayer MoS2". Science Advances 6, n.º 49 (diciembre de 2020): eabc9308. http://dx.doi.org/10.1126/sciadv.abc9308.

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Surface functionalization of metallic and semiconducting 2D transition metal dichalcogenides (TMDs) have mostly relied on physi- and chemi-sorption at defect sites, which can diminish the potential applications of the decorated 2D materials, as structural defects can have substantial drawbacks on the electronic and optoelectronic characteristics. Here, we demonstrate a spontaneous defect-free functionalization method consisting of attaching Au single atoms to monolayers of semiconducting MoS2(1H) via S-Au-Cl coordination complexes. This strategy offers an effective and controllable approach for tuning the Fermi level and excitation spectra of MoS2 via p-type doping and enhancing the thermal boundary conductance of monolayer MoS2, thus promoting heat dissipation. The coordination-based method offers an effective and damage-free route of functionalizing TMDs and can be applied to other metals and used in single-atom catalysis, quantum information devices, optoelectronics, and enhanced sensing.
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39

Jeannin, Mathieu, Pamela Rueda-Fonseca, Edith Bellet-Amalric, Kuntheak Kheng y Gilles Nogues. "Deterministic radiative coupling between plasmonic nanoantennas and semiconducting nanowire quantum dots". Nanotechnology 27, n.º 18 (22 de marzo de 2016): 185201. http://dx.doi.org/10.1088/0957-4484/27/18/185201.

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40

Tang, Yan-Hao. "Exotic states in moiré superlattices of twisted semiconducting transition metal dichalcogenides". Acta Physica Sinica 72, n.º 2 (2023): 1. http://dx.doi.org/10.7498/aps.72.20222080.

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Moiré superlattices formed by van der Waals materials with small lattice mismatch or twist angle open an unprecedented approach to generate flat bands that don’t exist in the “parent” materials, which provides a controllable platform for exploring quantum many body physics. Owing to the wide angle range for the existence of flat bands, as well as the valley-spin-locking band structure and the excellent optical properties, twisted semiconducting transition metal dichalcogenides (TMDs) heterostructures have recently attracted lots of attention. In this review, we discuss the exotic states discovered in the twisted TMDs heterostructures, including Mott insulator, generalized Wigner crystals, topological non-trivial states, and moiré excitons, how to manipulate these exotic states and related mechanisms, and finally some perspectives on the opportunities and challenges in this field.
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41

Araujo, F. D. V., F. W. N. Silva, T. Zhang, C. Zhou, Zhong Lin, Nestor Perea-Lopez, Samuel F. Rodrigues et al. "Substrate-Induced Changes on the Optical Properties of Single-Layer WS2". Materials 16, n.º 7 (24 de marzo de 2023): 2591. http://dx.doi.org/10.3390/ma16072591.

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Among the most studied semiconducting transition metal dichalcogenides (TMDCs), WS2 showed several advantages in comparison to their counterparts, such as a higher quantum yield, which is an important feature for quantum emission and lasing purposes. We studied transferred monolayers of WS2 on a drilled Si3N4 substrate in order to have insights about on how such heterostructure behaves from the Raman and photoluminescence (PL) measurements point of view. Our experimental findings showed that the Si3N4 substrate influences the optical properties of single-layer WS2. Beyond that, seeking to shed light on the causes of the PL quenching observed experimentally, we developed density functional theory (DFT) based calculations to study the thermodynamic stability of the heterojunction through quantum molecular dynamics (QMD) simulations as well as the electronic alignment of the energy levels in both materials. Our analysis showed that along with strain, a charge transfer mechanism plays an important role for the PL decrease.
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42

Asokan, M. y A. John Peter. "Electronic Properties of Exciton in Mg Based II–VI Wide Band Gap Semiconducting Quantum Dots". Journal of Advanced Physics 6, n.º 1 (1 de marzo de 2017): 126–32. http://dx.doi.org/10.1166/jap.2017.1304.

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Electronic properties of exciton in Mg based ZnS, ZnSe and ZnTe wide band gap semiconductor cylindrical quantum dots are investigated taking into consideration of geometrical confinement effect. The confinement potentials for various concentrations of Mg alloy content in Zn1–xMgxS/MgS, Zn1–xMgxSe/MgSe and Zn1–xMgxTe/MgTe quantum dots are studied and the constant barrier height is maintained for the Mg content in all the three heterostructures (Zn0.9Mg0.1S/MgS, Zn0.25Mg0.75Se/MgSe and Zn0.09Mg0.91Te/MgTe) to obtain the exciton binding energies and the optical transition energies. The results show that the band gap increases nonlinearly with the increase of composition of Mg alloy content in the taken materials due to the positive band gap bowing parameters and the exciton binding energies in Zn0.9Mg0.1S/MgS quantum dot are found to be more than the other two dots taken for studies. Our results will be helpful for some potential applications in full colour display devices and optical data storage devices.
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43

Kumar, Ajay, Priyam, Harikesh Meena, Jai Prakash, Ling Wang y Gautam Singh. "Recent advances on semiconducting nanomaterials–ferroelectric liquid crystals nanocomposites". Journal of Physics: Condensed Matter 34, n.º 1 (1 de noviembre de 2021): 013004. http://dx.doi.org/10.1088/1361-648x/ac2ace.

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Abstract Ferroelectric liquid crystals (FLCs) possess excellent electro-optical properties compared to nematic liquid crystals (LCs) including lower threshold voltage, faster switching response, good optical contrast and bi-stable switching, memory effect, etc. Due to such characteristic features, FLCs are more promising for next generation high performance photonic applications. Moreover, the synergy of FLCs with nanoscience has clearly shown the enormous possibilities to improve their electro-optical properties. Over the past two decades, several investigations of nanomaterials (NMs) (metal, metal oxide, ferroelectric, insulating, graphene, semiconducting etc) dispersed FLC nanocomposites have been carried out. Semiconducting nanomaterials (SNMs), exhibiting quantum confinement effect, have been one of the most explored NMs as dopants in FLCs leading to better molecular alignment, enhanced dielectric behaviour, pronounced memory effect, power efficient, faster switching response and enhanced photoluminescence. Here, we present a focussed review on SNMs–FLCs nanocomposites and propose future work to advance LC nanoscience.
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44

Sreckovic, Milesa, Stanko Ostojic, Jelena Ilic, Zoran Fidanovski, Sanja Jevtic, Dragan Knezevic y Marija Obrenovic. "Photoinduced processes, radiation interaction with material and damages - material hardness". Nuclear Technology and Radiation Protection 30, n.º 1 (2015): 23–34. http://dx.doi.org/10.2298/ntrp1501023s.

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Photo and nuclear radiation induced processes are considered through the interaction of radiation with semiconducting, metallic and other materials, including the scintillator materials. The improvement of component efficiency by the use of quantum generators, trimming and hybrid processes with nuclear radiation has been analyzed. The studied processes can be positive or negative depending on application. Besides the experimental approach to the processes and chosen interactions, the analytical description of our experiments, as well as ones from other references, has been performed. The contemporary couplings between the nuclear physics, laser techniques and respective dosimetric aspects have been considered.
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45

Pan, Jun, Hao Shen y Sanjay Mathur. "One-Dimensional SnO2Nanostructures: Synthesis and Applications". Journal of Nanotechnology 2012 (2012): 1–12. http://dx.doi.org/10.1155/2012/917320.

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Nanoscale semiconducting materials such as quantum dots (0-dimensional) and one-dimensional (1D) structures, like nanowires, nanobelts, and nanotubes, have gained tremendous attention within the past decade. Among the variety of 1D nanostructures, tin oxide (SnO2) semiconducting nanostructures are particularly interesting because of their promising applications in optoelectronic and electronic devices due to both good conductivity and transparence in the visible region. This article provides a comprehensive review of the recent research activities that focus on the rational synthesis and unique applications of 1D SnO2nanostructures and their optical and electrical properties. We begin with the rational design and synthesis of 1D SnO2nanostructures, such as nanotubes, nanowires, nanobelts, and some heterogeneous nanostructures, and then highlight a range of applications (e.g., gas sensor, lithium-ion batteries, and nanophotonics) associated with them. Finally, the review is concluded with some perspectives with respect to future research on 1D SnO2nanostructures.
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46

Dutta, Riya, Avradip Pradhan, Praloy Mondal, Saloni Kakkar, T. Phanindra Sai, Arindam Ghosh y Jaydeep Kumar Basu. "Enhancing Carrier Diffusion Length and Quantum Efficiency through Photoinduced Charge Transfer in Layered Graphene–Semiconducting Quantum Dot Devices". ACS Applied Materials & Interfaces 13, n.º 20 (17 de mayo de 2021): 24295–303. http://dx.doi.org/10.1021/acsami.1c04254.

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47

VIGNEASHWARI, B., S. DASH, A. K. TYAGI y S. AUSTIN SUTHANTHIRARAJ. "SYNTHESIS, CHARACTERIZATION, AND ASSEMBLY OF CdSe QUANTUM DOT ARRAY". International Journal of Nanoscience 07, n.º 01 (febrero de 2008): 9–19. http://dx.doi.org/10.1142/s0219581x0800516x.

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CdSe semiconducting nanoparticles in the range of 6–7 nm in size were synthesized by a soft chemical procedure at room temperature. The particles were characterized by powder X-ray diffraction, UV–visible optical spectroscopy revealing nanocrystallization, and quantum mechanical electron confinement. Photoluminescence and Raman spectroscopy of these nanocrystalline powders indicated optical phonon confinement. Asymmetric line shapes revealed occurrence of nonzone center phonons. The particles could be successfully deposited on ITO substrate by electrophoresis to obtain self-organized quantum dot array. Scanning electron microscopy, high-resolution scanning electron microscopy, confocal fluorescence microscopy, and atomic force microscopy investigations revealed self-similar deposits.
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48

Ibragimov, G. B. "Free-carrier absorption in semiconducting quantum well wires for alloy-disorder scattering". Journal of Physics: Condensed Matter 14, n.º 34 (22 de agosto de 2002): 8145–52. http://dx.doi.org/10.1088/0953-8984/14/34/332.

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49

Kostyrko, T. y S. Krompiewski. "A model of a tunable quantum dot in a semiconducting carbon nanotube". Semiconductor Science and Technology 23, n.º 8 (23 de julio de 2008): 085024. http://dx.doi.org/10.1088/0268-1242/23/8/085024.

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50

Mohanan, Jaya L., Indika U. Arachchige y Stephanie L. Brock. "Porous Semiconductor Chalcogenide Aerogels". Science 307, n.º 5708 (21 de enero de 2005): 397–400. http://dx.doi.org/10.1126/science.1104226.

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Chalcogenide aerogels based entirely on semiconducting II-VI or IV-VI frameworks have been prepared from a general strategy that involves oxidative aggregation of metal chalcogenide nanoparticle building blocks followed by supercritical solvent removal. The resultant materials are mesoporous, exhibit high surface areas, can be prepared as monoliths, and demonstrate the characteristic quantum-confined optical properties of their nanoparticle components. These materials can be synthesized from a variety of building blocks by chemical or photochemical oxidation, and the properties can be further tuned by heat treatment. Aerogel formation represents a powerful yet facile method for metal chalcogenide nanoparticle assembly and the creation of mesoporous semiconductors.
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