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Letteratura scientifica selezionata sul tema "Bulk heterojunction organic solar cell"

Autore: Grafiati

Pubblicato: 25 gennaio 2025

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Articoli di riviste sul tema "Bulk heterojunction organic solar cell"

Haque, A., F. Sultana, M. A. Awal e M. Rahman. "Efficiency Improvement of Bulk Heterojunction Organic Photovoltaic Solar Cell through Device Architecture Modification". International Journal of Engineering and Technology 4, n. 5 (2012): 567–72. http://dx.doi.org/10.7763/ijet.2012.v4.434.

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Deibel, Carsten, Vladimir Dyakonov e Christoph J. Brabec. "Organic Bulk-Heterojunction Solar Cells". IEEE Journal of Selected Topics in Quantum Electronics 16, n. 6 (novembre 2010): 1517–27. http://dx.doi.org/10.1109/jstqe.2010.2048892.

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Cheng, Pei, Cenqi Yan, Yang Wu, Shuixing Dai, Wei Ma e Xiaowei Zhan. "Efficient and stable organic solar cells via a sequential process". Journal of Materials Chemistry C 4, n. 34 (2016): 8086–93. http://dx.doi.org/10.1039/c6tc02338j.

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Arbab, Elhadi A. A., Bidini A. Taleatu e Genene Tessema Mola. "Ternary molecules blend organic bulk heterojunction solar cell". Materials Science in Semiconductor Processing 40 (dicembre 2015): 158–61. http://dx.doi.org/10.1016/j.mssp.2015.06.057.

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Majumder, Chandrachur, Akansha Rai e Chayanika Bose. "Performance optimization of bulk heterojunction organic solar cell". Optik 157 (marzo 2018): 924–29. http://dx.doi.org/10.1016/j.ijleo.2017.11.114.

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Ismail, Yasser A. M., T. Soga e T. Jimbo. "Investigation of PCBM Concentration on the Performance of Small Organic Solar Cell". ISRN Renewable Energy 2012 (16 agosto 2012): 1–8. http://dx.doi.org/10.5402/2012/385415.

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We have fabricated bulk heterojunction organic solar cells using coumarin 6 (C6) as a small organic dye, for light harvesting and electron donating, with fullerene derivative [6,6]-phenyl-C61 butyric acid methyl ester (PCBM), acting as an electron acceptor, by spin-coating technique of the blend solutions. We have studied effect of PCBM concentration on photocurrent and performance parameters of the solar cells. We found that the optical absorption of the dye increased with increasing its concentration in the active layer blends. The higher concentrations of PCBM in active layer enhanced the photocurrent of the solar cells, as a result of improving charge carrier separation and electron transport in solar cell active layer. The improved charge carrier separation between C6, as a donor, and PCBM, as an acceptor, was indicated through the formation of bulk heterojunction by blending C6 with PCBM. The formation of C6:PCBM bulk heterojunction blend was confirmed through the symbatic behavior of the corresponding solar cell and, also, through the homogeneity and smoothing in the atomic force microscopy images of the C6:PCBM blend films. For the same reasons, the performance parameters of the C6:PCBM solar cell improved by modification of the PCBM concentration in the solar cell active layer.

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Widmer, Johannes, Karl Leo e Moritz Riede. "Temperature dependent behavior of flat and bulk heterojunction organic solar cells". MRS Proceedings 1493 (2013): 269–73. http://dx.doi.org/10.1557/opl.2013.101.

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ABSTRACTThe open-circuit voltage of an organic solar cell is increasing with decreasing temperature and with increasing illumination intensity. These dependencies are quantitatively investigated for two types of organic solar cells, one with a flat donor-acceptor heterojunction and one with a mixed layer bulk heterojunction. Zinc-phthalocyanine and C60 are used as donor and acceptor, respectively. A qualitative difference is found for the two geometries. We find that a logarithmic illumination intensity dependence with temperature as a linear pre-factor of the logarithm, which is commonly reported and observed, is applicable for the bulk heterojunction. The flat heterojunction, in contrast, shows a constant illumination intensity pre-factor which is independent of the temperature, and the temperature can be modeled as additional linear summand.

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Trindade, A. J., e L. Pereira. "Bulk Heterojunction Organic Solar Cell Area-Dependent Parameter Fluctuation". International Journal of Photoenergy 2017 (2017): 1–10. http://dx.doi.org/10.1155/2017/1364152.

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Organic solar cell efficiency is known to be active area dependent and is usually a problem in the upscale factor for market applications. In this work, a detailed study of organic photovoltaic devices with active layer based on poly(3-hexylthiophene) (P3HT) and 1-(3-methoxycarbonyl)-propyl-1-phenyl-(6,6)C61 (PCBM) is made, evaluating the effect of the change on the active area from 10−2 to 4 cm4. The device structure was kept simple in order to allow the understanding of the physical effects involved. Device figures of merit were extracted from the equivalent circuit using a genetic-based algorithm, and their relationship with the active area was compared. It is observed that the efficiency drops significantly with the active area increase (as the fill factor) while the parallel and series resistance, adjusted to the active area, seems to be relatively constant and increases linearly, respectively. The short circuit current and the generated photocurrent also drop significantly with the active area increase. The open circuit voltage does not show major changes. These results are discussed considering the main influences for the observed efficiency data. Particularly, as the basic circuit model seems to fail to explain the macroscopic results, the behavior can be related with the enlargement of defect interaction.

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Kronenberg, Nils M. "Optimized solution-processed merocyanine:PCBM organic bulk heterojunction solar cell". Journal of Photonics for Energy 1, n. 1 (1 gennaio 2011): 011101. http://dx.doi.org/10.1117/1.3528043.

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Kesinro, R. O., A. O. Boyo, M. L. Akinyemi e G. T. Mola. "Fabrication of P3HT: PCBM bulk heterojunction organic solar cell". IOP Conference Series: Earth and Environmental Science 331 (16 ottobre 2019): 012028. http://dx.doi.org/10.1088/1755-1315/331/1/012028.

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Più fonti

Tesi sul tema "Bulk heterojunction organic solar cell"

Sahare, Swapnil Ashok. "Enhancing the Photovoltaic Efficiency of a Bulk Heterojunction Organic Solar Cell". TopSCHOLAR®, 2016. http://digitalcommons.wku.edu/theses/1609.

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Active layer morphology of polymer-based solar cells plays an important role in improving power conversion efficiency (PCE). In this thesis, the focus is to improve the device efficiency of polymer-based solar cells. In the first objective, active layer morphology of polymer-solar cells was optimized though a novel solvent annealing technique. The second objective was to explore the possibility of replacing the highly sensitive aluminum cathode layer with a low-cost and stable alternative, copper metal. Large scale manufacturing of these solar cells is also explored using roll-to-roll printing techniques. Poly (3-hexylthiophene) (P3HT) and phenyl-C61-butyric acid methyl (PCBM) were used as the active layer blend for fabricating the solar cell devices using bulk heterojunction (BHJ), which is a blend of a donor polymer and an acceptor material. Blends of the donor polymer, P3HT and acceptor, PCBM were cast using spin coating and the resulting active layers were solvent annealed with dichlorobenzene in an inert atmosphere. Solvent annealed devices showed improved morphology with nano-phase segregation revealed by atomic force microscopy (AFM) analysis. The roughness of the active layer was found to be 6.5 nm. The nano-phase segregation was attributed to PCBM clusters and P3HT domains being arranged under the solvent annealing conditions. These test devices showed PCE up to 9.2 % with current density of 32.32 mA/cm2, which is the highest PCE reported to date for a P3HT-PCBM based system. Copper was deposited instead of the traditional aluminum for device fabrication. We were able to achieve similar PCEs with copper-based devices. Conductivity measurements were done on thermally deposited copper films using the two-probe method. Further, for these two configurations, PCE and other photovoltaic parameters were compared. Finally, we studied new techniques of large scale fabrication such as ultrasonic spray coating, screen-printing, and intense pulse light sintering, using the facilities at the Conn Center for Renewable Energy Research at the University of Louisville. In this study, prototype devices were fabricated on flexible ITO coated plastics. Sintering greatly improved the conductivity of the copper nano-ink cathode layer. We will explore this technique’s application to large-scale fabrication of solar cell devices in the future work.

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Zhou, Xuan. "Structural engineering of porphyrin small molecules for bulk heterojunction organic solar cell applications". HKBU Institutional Repository, 2018. https://repository.hkbu.edu.hk/etd_oa/563.

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Organic donor and acceptor have promised the better future energy technologies to alleviate global energy demand and environmental issues. And nowadays they begin to come true in bulk heterojunction organic solar cells (BHJ OSCs) with advantages of low-cost, light-weight, large-area, flexibility, and with high efficiencies (PCEs) of over 14% for converting solar energy to electricity. Porphyrins are unique potential for artificial photocatalysis but their application in BHJ OSCs are still limited by the PCEs less than 10%. This complicacy comes from their inadequate spectral absorptions and the imperfect morphologies. In this thesis, we devote to chemical modification of acceptor-π-porphyrin-π-acceptor (A-π-Por-π-A) structural molecules to enhance their spectral absorptions and phase-separation functions with fullerene acceptor. Firstly, chemically driving J-aggregates have been studied on the new A-π-Por-π-A porphyrin molecule, which could improve the phase-separation of its blend film with PC71BM and and enhance its performance in BHJ OSCs with PCE up to 8.04%. Secondly, two new benzodithiophene (BDT) π-bridged A-π-Por-π-A molecules have been prepared with complementary absorption between the Soret and Q bands. The devices based on the blend fims of the porphyrin donor and PC71BM acceptor exhibit full spectral photocurrent generation and impressive PCEs up to 7.92%. Thirdly, we further extended the π-conjugation of the above BDT π-brigded A-π-Por-π-A molecules by inserting alkyl chain substituted thiophene derivatives into their backbones, resulting in new porphyrin molecules with UV-visible-near-infraed absorption spectra. Using those porphyrin molecules as donor and PCBM as acceptor, the devices show full spectra photocurrent generatoion and appropriate film morphology, resulting in high PCE up to 8.59%. Besides, photocatalysis is also a new promising technology to generate renewable energy. We herein develop new low-cost and noble-metal-free photocatalysts based on Co(OH)2 modified CdS nanowires and applied them for visible light driven hydrogen production from water-splitting. The optimum H2 production rate reaches 14.43 mmol·h−1·g−1 under (λ ≥ 420 nm) upon visible light irradiation, which is 206 and 3 times larger than that of the pristine CdS NWs and 1 wt% Pt-CdS NWs, respectively. The results indicate the promising application of earth-abundant Co(OH)2 as alternative cocatalysts of noble metals.

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Liu, Jiang. "P3HT:PCBM Bulk Heterojunction Organic Solar Cell : Performance Optimization and Application of Inkjet Printing". Thesis, Linköping University, Department of Science and Technology, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-14987.

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Organic solar cells have emerged as an important cheap photovoltaic technology. In this thesis work, a study of P3HT:PCBM heterojunction solar cells was presented. By incorporation of photo-active film slow growth, PEDOT:PSS (Poly(3,4-ethylenedioxythiophene) poly(styrenesulfonate)) de-water treatment and application of highly conductive PEDOT:PSS (HC-PEDOT), a maximum PCE (power conversion efficiency) of 4% was achieved.

Inkjet printing technique was on the other hand introduced into fabrication process. The morphological, electrical and optical properties of printed HC-PEDOT were investigated. Fine silver girds with well-designed pattern, combining with a transparent thin film of HC-PEDOT, was inkjet-printed to form the anode of solar cells. A functional device with printed anode and printed photo-active layer was demonstrated, showing the possibility of realizing fully printed organic solar cells.

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Augustine, B. (Bobins). "Efficiency and stability studies for organic bulk heterojunction solar cells". Doctoral thesis, Oulun yliopisto, 2016. http://urn.fi/urn:isbn:9789526214436.

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Abstract The qualitative and quantitative characteristics of each component layer constituting the structure of organic bulk heterojunction solar cells (OSC-BHJ) contribute significantly towards its overall performance. One of the prevalent issues resulting in reduced device efficiency is due to the conformational inhomogeneities in the active and buffer layers. The mechanical stress, extended thermal exposure and presence of mutually reactive component layers etc., affects negatively on the device stability. Effective methods to address these issues will be extensively benefited by the industry since the current commercialisation of the technology is hindered owing to the lower efficiency and stability of these devices. This dissertation focuses on methods to coherently enhance the performance and longevity of the OSC-BHJ devices. The efficiency enhancements of the devices in this work were achieved through two main routes. The first route was through morphological improvement of the active layer. The second route was through boosting the electrical characteristics of hole transporting conducting polymer layer (HTL) by controlled annealing conditions. The introduction of a suitable additive in the active layer was found to reduce unfavourable phase segregation thus resulting in enhanced morphology. Further, the annealing conditions in different atmospheres (air, nitrogen and vacuum) were found to have a clear influence on the optimum functioning of the HTL in the device. Regarding the stability improvement study done in this work, a method of employing suitable interlayer was developed to effectively abate the internal degradation occurring in the device due to etching reaction on the indium tin oxide (ITO) anode by the HTL. Moreover, experimental investigations were carried out for drawing fundamental understanding of stability degenerating issues such as the influence of mechanical defects on transparent conducting metal oxide (ITO) anode on the performance of the device and heat induced degradations in the low band gap polymer-fullerene active layer. The highlight of this research is that the discovered methods are inexpensive, efficient, and easy to adopt. The results of the study could help the technology to overcome some of its limitations and accelerate its progress towards commercialisation
Tiivistelmä Orgaanisten heteroliitosaurinkokennojen kerrosrakenteen ominaisuudet ja laatu vaikuttavat merkittävästi aurinkokennojen toiminnallisuuteen. Erityisesti rakenteelliset epähomogeenisuudet aktiivi- ja puskurikerroksissa heikentävät kennon hyötysuhdetta. Kennojen stabiilisuutta tarkasteltaessa myös mekaanisella rasituksella, pitkittyneellä lämpöaltistuksella ja materiaalien reagoinneilla keskenään kerrosten välillä, on selkeä negatiivinen vaikutus kennojen stabiilisuuteen. Orgaanisen aurinkokennoteknologian kaupallistamisen rajoitteina ovat kennojen heikko hyötysuhde ja stabiilisuus, joten menetelmät jotka tarjoavat ratkaisuja edellä mainittuihin ongelmiin, ovat erittäin tärkeitä teknologiaa kaupallistavalle teollisuudelle. Tämä väitöskirja keskittyy johdonmukaisesti selvittämään tapoja, joilla voidaan parantaa heteroliitosaurinkokennojen hyötysuhdetta ja elinikää. Hyötysuhteen tehostamiseksi valittiin kaksi eri lähestymistapaa, joista ensimmäisessä keskityttiin aktiivikerroksen morfologian parantamiseen ja toisessa aukkoja kuljettavan kerroksen sähköisten ominaisuuksien parantamiseen lämpökäsittelyprosessin avulla. Sopivan lisäaineen avulla aktiivikerroksen ei-toivottua kiteytymistä voidaan pienentää ja parantaa näin kerroksen morfologiaa. Lisäksi työssä todettiin, että lämpökäsittelyn aikaisella ympäristöolosuhteella (ilma, typpi, tyhjiö) on merkittävä vaikutus puskurikerroksen optimaaliseen toimintaan aurinkokennossa. Stabiilisuuden parantamiseksi kehitettiin välikerroksen hyödyntämiseen perustuva menetelmä, jolla voidaan tehokkaasti vähentää kennojen sisäisessä rakenteessa tapahtuvaa toiminnallisuuden heikkenemistä, joka aiheutuu aukkoja kuljettavan kerroksen syövyttävästä vaikutuksesta indiumtinaoksidi (ITO) pohjaiseen anodiin. Tämän lisäksi työssä tutkittiin kokeellisesti stabiilisuuteen heikentävästi vaikuttavia tekijöitä, kuten mekaanisen rasituksen aiheuttamia vaurioita metallioksidi (ITO) anodissa ja lämpöaltistuksesta aiheutuvia vikoja polymeeri-fullereeni rakenteeseen perustuvassa aktiivikerroksessa. Tutkimuksen keskeisin tulos on, että esitellyt keinot aurinkokennojen hyötysuhteen ja stabiilisuuden parantamiseen ovat edullisia, tehokkaita ja helppoja hyödyntää. Tulokset voivat merkittävästi edistää orgaanisten aurinkokennojen teknistä kehitystä ja kiihdyttää niiden tuloa kaupallisiksi tuotteiksi

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Lan, Weixia. "Light harvesting and charge collection in bulk heterojunction organic solar cells". HKBU Institutional Repository, 2016. https://repository.hkbu.edu.hk/etd_oa/318.

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As a clean and non-exhaustible energy source, solar energy is becoming increasingly important in reducing energy prices and influencing the global climate change. Compared to the traditional inorganic solar cells, conjugated polymer-based organic solar cells (OSCs) have shown much promise as an alternative photovoltaic technology for producing solar cells on large scale at low-cost. However, despite the rapid progresses made in the development of new donor materials, fullerene derivatives and hybrid small molecule/polymer blends, the efficiency and stability of OSCs are still limitations on the potential applications. The performance of OSCs is primarily hampered by the limited light absorption, caused by the mismatch between light absorption depth and carrier transport scale, low carrier mobility and unstable electrode/organic interfacial properties. Improved utilization of light in solution-processed OSCs via different light trapping schemes is a promising approach. The feasibility of light trapping using surface plasmonic structures and textured surfaces to confine light more efficiently into OSCs has been demonstrated. However, plasmon excitations are localized only in the vicinity of metal/organic interface, while the absorption enhancement due to the textured surfaces improves light trapping irrespective of the wavelength. A generic approach towards improving light harvesting in the organic active layer thinner than optical absorption length is one of the key strategies to the success of OSCs. The aim of this PhD project is to undertake a comprehensive study to analyze broadband and omnidirectional light absorption enhancement in bulk heterojunction (BHJ) OSCs, to understand the dynamics of charge transport, charge recombination, charge collection, and to develop solutions to improve the stability of OSCs. In this work, the broadband light absorption enhancement in solution-processed BHJ OSCs is realized by incorporating 2-D photonic structures in the active layer, formed using a nano-imprinting method. The performance of photonic-structured OSCs and planar control cells, fabricated with the blend of poly[4,8-bis[(2-ethylhexyl)oxy]benzo[1,2-b:4,5-bA] dithiophene-2,6-diyl] [3-fluoro-2-[(2ethylhexyl) carbonyl] thieno[3,4-b]-thiophenediyl] (PTB7): [6,6]-phenyl-C70-butyric-acid-methyl-ester (PC70BM) is analyzed. By introducing the photonic structures with 500 nm structure period, the performance of structured OSCs is optimized by adjusting the structure height in the active layer. With the comparison of the current densityvoltage (JV) characteristics, the incident photon to charge carrier efficiency (IPCE) spectra and also the finite-difference time-domain (FDTD) calculated electric field distributions, our results reveal that the photonic structures allow improving light absorption in PTB7:PC70BM layer, especially in the long wavelength region. It is shown that the photonic-structured OSCs possess a 6.15 % increase in power conversion efficiency (PCE) and a 7.53 % increase in short circuit current density (JSC) compared to that of a compositionally identical planar control cell. Light absorption in the 2-D photonic-structured OSCs is a function of the photonic structures and the optical properties of the active layer. The correlation between the choice of the photonic structures and the enhanced spectral response in photonic-structured OSCs is analysed systematically using theoretical simulation and experimental optimization. It is found that the integrated absorption of the active layer decreases slightly with increase in the period of the photonic structures. The results reveal that the photonic-structured OSCs exhibit a stronger absorption enhancement over a broader range of the angle of incident light. The incorporation of the appropriate periodic nano-structures in the active layer is apparently favourable for efficient cell operation as compared to light absorption in the planar control cells made with the same blend system, which decreases rapidly with an increase in the angle of the incident light. Omnidirectional and broadband light absorption enhancement observed in photonic-structured OSCs agrees well with the theoretical simulation. More than 11% increase in the PCE of photonic-structured OSCs is obtained compared to that of an optimized planar control cell, caused mainly by the absorption enhancement in the active layer. 2-D photonic structures allow achieving broadband absorption enhancement in OSCs over a wider range of the angle of the incident light from -45 deg to +45 deg with respect to the normal to the cell surface. For example, the higher light absorption in the active layer of photonic-structured OSCs, integrated over the visible light wavelength range from 380 nm to 780 nm, changes slightly from 70.1% (normal) to 67.7% (45 deg), remaining 96.6% of the absorption in the cells at the normal incidence. While for the control planar OSC, the integrated absorption follows a faster decrease from 66.2% (normal) to 62.2% (45 deg), revealing a quicker reduction in the absorption of the cells at an angle of the incident light away from the normal incidence. In addition to the absorption enhancement, charge transport, recombination and collection are also prominent factors for the efficient operation of OSCs. Thus, it is crucial to improve the understanding of these important processes and their impacts on the cell performance in order to design optimized device architectures. The charge recombination processes, the distribution of charge density under different operation conditions and charge collection at the organic/electrode interfaces in PTB7:PC70BM-based OSCs are studied systematically using a combination of theoretical calculation, transient photocurrent (TPC) measurements, morphology analyses and device optimization. The charge transport and recombination properties in the BHJ OSCs are investigated using the photo-induced charge extraction by linearly increasing voltage (Photo-CELIV) method. Combined with light intensity-dependent J--V characteristic and TPC measurements, it is shown that the use of the ZnO cathode interlayer has a profound effect on enhancing charge collection efficiency and thereby improving in the overall performance of OSCs. The origin of the improvement in the cell performance is mainly associated with improved electrical properties. The TPC results reveal that the presence of the ZnO interlayer helps to prevent the unfavourable interfacial exciton dissociation for achieving efficient charge collection at the active layer/electrode interface. Light intensity-dependent J--V characteristics and the photo-CELIV results support the findings in showing that the charge recombination at the organic/cathode interface can be effectively suppressed by inserting a thin ZnO cathode interlayer, leading to a significant improvement in the charge collection efficiency. A comprehensive study on the degradation mechanisms of solution-processed BHJ. OSCs has been performed. It is manifested that the suppression in bi-molecular recombination and enhancement in charge mobility, achieved through appropriate electrode modification, is one of the effective approaches for achieving stable and performance reproducible OSCs. The effect of the solution-processed anode interlayer, e.g. a mixture of MoO3 and Au nanoparticles (MoO3:Au NPs), on the performance of BHJ OSCs is also examined, with the aim to replace the acidic and hygroscopic poly(3,4-ethylenedioxylenethiophene): polystyrene sulfonate (PEDOT:PSS) hole extraction layer (HEL). A 14.3% enhancement in the PCE of OSCs with an anode interlayer of MoO3:Au NPs (7.78%) is obtained compared to that of the structurally identical devices with a pristine MoO3-based interlayer (6.72%), due to the simultaneous improvements in both JSC and fill factor (FF). The accelerated aging tests for as-prepared structurally identical OSCs fabricated with different HELs were carried out in the ambient condition. It is shown that the solution-processed MoO3:Au NPs and pristine MoO3 interlayers are superior to the frequently-used PEDOT:PSS HEL for efficient operation over the long-term. PCE of the MoO3-based OSCs maintains about 40% of their initial value, while a catastrophic failure in the control devices with a PEDOT:PSS HEL is observed after the accelerated aging test under the same condition, with a high relative humidity of 90% at room temperature for 180 min. The degradation behavior of different OSCs performed in the accelerated aging test correlates well with light-intensity JV characteristic and TPC measurements. The outcomes of this work help to the creation of device knowledge and process integration technologies for realization of high performance solution-processed OSCs. It is anticipated that the adoption of the affordable organic photovoltaic technology as one of the clean energy sources will contribute to the preservation of the environment.

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Tessarolo, Marta <1985&gt. "Organic Bulk Heterojunction Solar Cells: Materials Properties Device Stability And Performance". Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2016. http://amsdottorato.unibo.it/7266/1/Tesi_PhD_Marta_Tessarolo.pdf.

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In the field of Photovoltaic technologies the organic solar cells are particularly attractive because of their ease of processing, mechanical flexibility and potential low cost production techniques. So far, the reported efficiencies are not high enough to allow to be competitive in the market, however with the introduction of new photoactive materials, device architectures and light management structures, the power conversion efficiencies, at laboratory scale, has rapidly reached the 12%, showing a great potential and a bright future for organic solar cells. Nevertheless, in view of commercial products, two main problems are still unresolved: the relatively low performance of the modules and their lifetime. In sight of this, the present Ph.D thesis has a double goal: 1) a better understanding of the relationship between devices performance and photoactive materials structures 2) a deep investigation on device degradation processes, with particular attention on the effects induced by temperature and incident light. As a result, promising approaches to further optimize the polymer’s optoelectrial properties, and thus the corresponding device performance, are proposed. About the lifetime, first the thermal degradation mechanisms involved on the active layer was investigated and it has been demonstrated the role of the other layers and interfaces in the solar cell thermal stability. In this contest an innovative fast capacitance based thermal test has been developed in order to obtain information regarding the limit operating temperature above which the device becomes thermally unstable. In the end, a preliminary study on the photostability issue was carried out demostrating that the photodegradation of organic solar cells not depends just on the photostability of the donor polymer, but is connected also with the composition of the active layer solution and on the interaction with the adjacent layers. Solutions to limit or prevent the devices degradation processes are proposed.

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Han, Tianyan. "Bulk heterojunction solar cells based on solution-processed triazatruxene derivatives". Thesis, Strasbourg, 2017. http://www.theses.fr/2017STRAD036/document.

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La conception de cellules solaires organiques de type hétérojonction en volume a été proposée pour la première fois en 1990. Ces dispositifs sont composés d’un mélange de polymères conjugués, donneurs d’électrons, et de fullerènes, accepteur d’électrons, et ont pour la première fois permis d’atteindre un rendement de conversion énergétique significatif (de l’ordre de 2%) avec des semi-conducteurs organiques. Dans ce contexte, cette thèse a porté sur l'étude approfondie d’une série de molécules donneurs d’électrons de forme d’haltère, dont le groupement planaire est l’unité triazatruxène (TAT) et le cœur déficient en électrons le thienopyrroledione (TPD). Les molécules de cette série se différencient par la nature des chaînes alkyles, attachées à l’unité centrale et aux unités TAT. Plus précisément, la relation entre la nature des chaînes latérales et les propriétés moléculaires et thermiques de ces molécules en forme d’haltère ont été étudiées en détail. L'impact des chaînes alkyles sur la morphologie en film mince à l’échelle nanométrique a également été étudié. Afin de mieux comprendre l’influence de la microstructure des films minces (constitués soit uniquement des molécules donneuses soit de mélanges molécules/fullerènes), le transport de charge dans le plan du film et perpendiculairement au plan ont été mesurées en fonction de la phase (amorphe, cristalline, …) du matériau. Des cellules solaires BHJ en mélange avec le dérivé de fullerène ont également été réalisées
The prospective conception of electron-donor/electron-acceptor (D/A) bulk heterojunction solar cells was first reported in 1990s, which blended the semiconducting polymer with fullerene derivatives, enhancing the power conversion efficiency. Since then, interests on this domain has been increasing continuously, and the efficiencies of BHJ solar cells have been increased dramatically. In this context, this thesis focuses on the study of a series of dumbbell-shaped small molecule donors, based on a highly planar unit called triazatruxene. The only difference between those molecules is the side-chains attached to central units and TAT units. As a consequence, the relationship between side chains nature and optoelectronic and structural properties of our TAT-based dumbbell-shaped molecular architecture will be investigated in detail. The impact of the alkyl chains on the molecular and thin film properties was also studied, with a particular emphasis put on microstructure and charge transport aspects. In-plane and out-of-plane charge carrier transport, with pure molecules and blend with fullerene, are measured in different systems. BHJ solar cells in blend with fullerene derivatives were also realized

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SALAMANDRA, LUIGI. "Organic photo-voltaic cells and photo-detectors based on polymer bulk-heterojunctions". Doctoral thesis, Università degli Studi di Roma "Tor Vergata", 2010. http://hdl.handle.net/2108/1294.

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Abstract (sommario):

Negli ultimi decenni, l’uso dei materiali organici per la realizzazione di dispositive elettronici si è guadagnato l’attenzione di molti gruppi di ricercatori. Questo è dovuto principalmente alla possibilità di usare, con questi materiali, tecniche di fabbricazione a basso costo da fase liquida, adatte anche per lo sviluppo di dispositivi su supporto flessibile, e di poter modificare le proprietà dei materiali stessi secondo le esigenze di applicazione. Particolarmente in optoelettronica, l’uso di questi materiali per la realizzazione di sorgenti luminose (OLED, diodo organico emettitore di luce, o OTFL, laser organici a film sottile), foto-diodi e celle solari è stato già dimostrato. In questo contesto, la combinazione di differenti dispositivi organici potrebbe spianare la strada a nuove applicazioni nel campo della comunicazione dati, sensoristica, digitalizzazione di immagini ed energia solare rinnovabile. I dispositivi foto-voltaici a eterogiunzione-bulk di polimeri coniugati depositati da soluzione liquida rappresentano una promessa nel campo della conversione di energia solare e della comunicazione dati, grazie ad una efficienza di conversione fino al ~5%, e una risposta temporale ad una sorgente ottica a ~200KHz.
In the last few decades, the use of organic materials for the realization of electronic devices has gained the attention of many research groups. This is mainly due to the possibility to use low-cost techniques for fabrication as solution-processing, suitable also to flexible substrates, and to tailor the material properties for specific applications. In the field of optoelectronics, the use of such materials for the realization of light sources (OLED, Organic Light-Emitting Diode, or OTFL, Organic Thin-Film Lasers), photo-diodes and solar cells has already been demonstrated. In this context, the combination of different organic devices for integrated optical systems, can pave the way to new applications in the field of data communication, sensing application, imaging and solar energy. Conjugated polymer bulk-heterojunction photo-voltaic device made from blend solution could be a good promise for solar energy conversion and data communication purpose, with its solar conversion efficiencies up to ~5% and a time-resolved response of ~200KHz to an optical source.

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Schilinsky, Pavel. "Loss analysis of the power conversion efficiency of organic bulk heterojunction solar cells". [S.l.] : [s.n.], 2005. http://deposit.ddb.de/cgi-bin/dokserv?idn=975187546.

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Liu, Jianhua, Bright Walker e Thuc-Quyen Nguyen. "Solution-Processed Molecular Bulk Heterojunction Solar Cells". In Organic Photovoltaics, 95–138. Weinheim, Germany: Wiley-VCH Verlag GmbH & Co. KGaA, 2014. http://dx.doi.org/10.1002/9783527656912.ch04.

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Tress, Wolfgang. "Simulation Study on Single-Layer Bulk-Heterojunction Solar Cells". In Organic Solar Cells, 277–312. Cham: Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-10097-5_5.

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Duan, Chunhui, Chengmei Zhong, Fei Huang e Yong Cao. "Interface Engineering for High Performance Bulk-Heterojunction Polymeric Solar Cells". In Organic Solar Cells, 43–79. London: Springer London, 2012. http://dx.doi.org/10.1007/978-1-4471-4823-4_3.

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Troshin, Pavel A., e Niyazi Serdar Sariciftci. "Organic nanomaterials for efficient bulk heterojunction solar cells". In Organic Nanomaterials, 549–78. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2013. http://dx.doi.org/10.1002/9781118354377.ch25.

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Brabec, Christoph J. "Semiconductor Aspects of Organic Bulk Heterojunction Solar Cells". In Organic Photovoltaics, 159–248. Berlin, Heidelberg: Springer Berlin Heidelberg, 2003. http://dx.doi.org/10.1007/978-3-662-05187-0_5.

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Kirchartz, Thomas, e Jenny Nelson. "Device Modelling of Organic Bulk Heterojunction Solar Cells". In Topics in Current Chemistry, 279–324. Berlin, Heidelberg: Springer Berlin Heidelberg, 2013. http://dx.doi.org/10.1007/128_2013_473.

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Duan, Chun-Hui, Fei Huang, Yong Cao, Niyazi Serdar Sariciftci, Yongfang Li, Guillermo C. Bazan e Xiong Gong. "Organic Materials and Chemistry for Bulk Heterojunction Solar Cells". In Organic Chemistry - Breakthroughs and Perspectives, 643–83. Weinheim, Germany: Wiley-VCH Verlag GmbH & Co. KGaA, 2012. http://dx.doi.org/10.1002/9783527664801.ch17.

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Wetzelaer, Gert-Jan A. H., L. Jan Anton Koster e Paul W. M. Blom. "Bimolecular and Trap-Assisted Recombination in Organic Bulk Heterojunction Solar Cells". In Organic Photovoltaics, 343–76. Weinheim, Germany: Wiley-VCH Verlag GmbH & Co. KGaA, 2014. http://dx.doi.org/10.1002/9783527656912.ch11.

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de Freitas, Jilian N., e Ana Flávia Nogueira. "Incorporation of Inorganic Nanoparticles into Bulk Heterojunction Organic Solar Cells". In Nanoenergy, 1–47. Berlin, Heidelberg: Springer Berlin Heidelberg, 2012. http://dx.doi.org/10.1007/978-3-642-31736-1_1.

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Riedel, I., M. Pientka e V. Dyakonov. "Charge Carrier Photogeneration and Transport in Polymer-Fullerene Bulk-Heterojunction Solar Cells". In Physics of Organic Semiconductors, 433–50. Weinheim, FRG: Wiley-VCH Verlag GmbH & Co. KGaA, 2006. http://dx.doi.org/10.1002/3527606637.ch15.

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Atti di convegni sul tema "Bulk heterojunction organic solar cell"

Nguyen, Thuc-Quyen. "Insight into degradation mechanisms of bulk heterojunction organic solar cells". In Organic, Hybrid, and Perovskite Photovoltaics XXV, a cura di Gang Li e Natalie Stingelin, 4. SPIE, 2024. http://dx.doi.org/10.1117/12.3029477.

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Farooq, Waqas, Mahmood Khan e Aimal Daud Khan. "High Performance Bulk-Heterojunction Organic Solar Cells". In 2019 International Conference on Electrical, Communication, and Computer Engineering (ICECCE). IEEE, 2019. http://dx.doi.org/10.1109/icecce47252.2019.8940743.

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Sabri, Nasehah Syamin, Chi Chin Yap, Muhammad Yahaya e Muhamad Mat Salleh. "MEHPPV:PCBM-based bulk heterojunction organic solar cell blended with various organic salts". In 2012 NATIONAL PHYSICS CONFERENCE: (PERFIK 2012). AIP, 2013. http://dx.doi.org/10.1063/1.4803608.

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Pivrikas, Almantas, Gytis Juška, Markus Scharber, Niyazi Serdar Sariciftci e Ronald Österbacka. "Charge Transport and Recombination in Bulk-Heterojunction Solar Cells". In Organic Photonics and Electronics. Washington, D.C.: OSA, 2006. http://dx.doi.org/10.1364/ope.2006.optuc3.

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Li, Kejia, Lijun Li, Petr P. Khlyabich, Beate Burkhart, Barry C. Thompson e Joe C. Campbell. "Efficiency limitations in organic bulk heterojunction solar cells". In 2012 IEEE 38th Photovoltaic Specialists Conference (PVSC). IEEE, 2012. http://dx.doi.org/10.1109/pvsc.2012.6318222.

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Mohan, Minu, Ramkumar Sekar e Manoj A. G. Namboothiry. "Plasmon enhanced power conversion efficiency in inverted bulk heterojunction organic solar cell". In Organic, Hybrid, and Perovskite Photovoltaics XVIII, a cura di Kwanghee Lee, Zakya H. Kafafi e Paul A. Lane. SPIE, 2017. http://dx.doi.org/10.1117/12.2273610.

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Koh, W. S., Yu A. Akimov, Y. Li, M. S. Soh, W. P. Goh e H. S. Chu. "Optical Enhancement with Plasmonic Nanoparticles in Organic Bulk-Heterojunction Solar Cells". In Optics for Solar Energy. Washington, D.C.: OSA, 2010. http://dx.doi.org/10.1364/ose.2010.swa3.

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Neukom, Martin T., Nils A. Reinke, Kai A. Brossi e Beat Ruhstaller. "Transient photocurrent response of organic bulk heterojunction solar cells". In SPIE Photonics Europe, a cura di Paul L. Heremans, Reinder Coehoorn e Chihaya Adachi. SPIE, 2010. http://dx.doi.org/10.1117/12.854668.

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Solanki, Ankur, Bo Wu, Yeng Ming Lam e Tze Chien Sum. "Charge dynamics in alkanedithiols-additives in P3HT:PCBM bulk heterojunction solar cells". In SPIE Organic Photonics + Electronics, a cura di Zakya H. Kafafi, Paul A. Lane e Ifor D. W. Samuel. SPIE, 2014. http://dx.doi.org/10.1117/12.2061434.

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Kumar, Kamal, Abhijit Das, Uttam Kumawat, Pankaj Das, Sumakesh Mishra e Anuj Dhawan. "Plasmonic enhancement of absorption in bulk-heterojunction organic solar cells". In Organic Photonic Materials and Devices XXI, a cura di Christopher E. Tabor, François Kajzar e Toshikuni Kaino. SPIE, 2019. http://dx.doi.org/10.1117/12.2515404.

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Rapporti di organizzazioni sul tema "Bulk heterojunction organic solar cell"

Zimanyi, Gergely, e Mariana Bertoni. EXPLORING SI HETEROJUNCTION SOLAR CELL DEGRADATION: BULK AND INTERFACE PROCESSES ANALYZED BY SIMULATIONS AND EXPERIMENTS IN ORDER TO DEVELOP MITIGATION STRATEGIES. Office of Scientific and Technical Information (OSTI), dicembre 2021. http://dx.doi.org/10.2172/1836838.

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