Готові списки джерел за темами / Formamidinium

Добірка наукової літератури з теми "Formamidinium"

Автор: Grafiati
Опубліковано: 6 вересня 2023
Оновлено: 7 вересня 2023

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Статті в журналах з теми "Formamidinium"

1

Ahlawat, Paramvir, Alexander Hinderhofer, Essa A. Alharbi, Haizhou Lu, Amita Ummadisingu, Haiyang Niu, Michele Invernizzi та ін. "A combined molecular dynamics and experimental study of two-step process enabling low-temperature formation of phase-pure α-FAPbI3". Science Advances 7, № 17 (квітень 2021): eabe3326. http://dx.doi.org/10.1126/sciadv.abe3326.

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Анотація:
It is well established that the lack of understanding the crystallization process in a two-step sequential deposition has a direct impact on efficiency, stability, and reproducibility of perovskite solar cells. Here, we try to understand the solid-solid phase transition occurring during the two-step sequential deposition of methylammonium lead iodide and formamidinium lead iodide. Using metadynamics, x-ray diffraction, and Raman spectroscopy, we reveal the microscopic details of this process. We find that the formation of perovskite proceeds through intermediate structures and report polymorphs found for methylammonium lead iodide and formamidinium lead iodide. From simulations, we discover a possible crystallization pathway for the highly efficient metastable α phase of formamidinium lead iodide. Guided by these simulations, we perform experiments that result in the low-temperature crystallization of phase-pure α-formamidinium lead iodide.
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2

Fan, Zhicheng, Chuwu Xing, Yi Tan, Jinxia Xu, Lingyun Liu, Yuanming Zhou, and Yan Jiang. "The effect of CO2-doped spiro-OMeTAD hole transport layer on FA(1−x)CsxPbI3 perovskite solar cells." Journal of Chemical Research 46, no. 6 (November 2022): 174751982211360. http://dx.doi.org/10.1177/17475198221136079.

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Анотація:
Black-phase formamidinium lead iodine with 1.48 eV bandgap is considered to be the most promising material for improving the near-theoretical limit efficiency of perovskite solar cells, but at room temperature, black-phase formamidinium lead iodine easily transforms into the yellow non-perovskite phase formamidinium lead iodine. Here, different ratios of Cs+-incorporated formamidinium lead iodine prepared by one-step processing with the stability and power conversion efficiency of formamidinium lead iodine perovskite solar cells are investigated. FA0.85Cs0.15PbI3 shows the highest power conversion efficiency of 10.63% (Voc = 1.04 V, Jsc = 16.81 mA cm−2, and fill factor = 0.60), and the unencapsulated device maintained 60% of the initial power conversion efficiency after storage in air with 40% humidity for 186 h with an active area of 0.1 cm2, when the ratios of Cs+ reached 15% ( x = 0.15) in formamidinium lead iodine. However, the efficiency of perovskite solar cell–based formamidinium lead iodine is still low. In this work, a simple but an effective strategy was carried out to rapidly and fully oxidize hole transport layer solution by doping CO2 or O2 under ultraviolet light irradiation to increase the conductivity of hole transport layer, thereby improving the power conversion efficiency of solar cells. The results show that FA0.85Cs0.15PbI3 solar cells by CO2-doped hole transport layer for 90 s exhibited the highest power conversion efficiency of 16.11% (VOC = 1.11 V, JSC = 19.73 mA cm−2, and fill factor = 0.74). The improved photovoltaic performance is attributed to CO2-doped spiro-OMeTAD increasing charge carrier density and accelerating charge separation, thereby inducing higher conductivity. CO2 or O2 doped can rapidly and fully oxidize spiro-OMeTAD, and reduce the solar cell fabrication time; it is beneficial to the commercial use of perovskite solar cells.
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3

Sukmas, Wiwittawin, Piyanooch Nedkun, Udomsilp Pinsook, Prutthipong Tsuppayakorn-aek, and Thiti Bovornratanaraks. "Effect of formamidinium cation on electronic structure of formamidinium lead iodide." Journal of Physics: Conference Series 1380 (November 2019): 012080. http://dx.doi.org/10.1088/1742-6596/1380/1/012080.

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4

Demant, Udo, Elke Conradi, Ulrich Müller, and Kurt Dehnicke. "Formamidinhim-Hexachloroferrat(III) Synthese und Kristallstruktur / Formamidinium-Hexachloroferrate(III) Synthesis and Crystal Structure." Zeitschrift für Naturforschung B 40, no. 3 (March 1, 1985): 443–46. http://dx.doi.org/10.1515/znb-1985-0324.

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Анотація:
[HC(NH2)2]3FeCl6 was obtained together with other products from the reaction of S4N4 with HCl in H2CCl2 in the presence of FeCl3. Its crystal structure was determined from X-ray diffraction data (473 independent observed reflexions, R = 0.047). Lattice constants: a = 961.6, c = 876.4 pm; tetragonal, space group P42/m, Z = 2. Of the two crystallographically independent formamidinium ions HC(NH2)2⊕, one exhibits positional disorder; the other one has C-N bond lengths of 128 pm. The FeCl63⊖ ions have symmetry C2h, but the deviation from Oh is small.
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5

Marchenko, Anatoliy, Georgyi Koidan, Anastasiya Hurieva, Eduard Rusanov, Alexander B. Rozhenko, and Aleksandr Kostyuk. "Dichlorophosphoranides Stabilized by Formamidinium Substituents." Heteroatom Chemistry 2020 (February 13, 2020): 1–6. http://dx.doi.org/10.1155/2020/9856235.

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Анотація:
Dichlorophosphoranides featuring N,N-dimethyl-N′-arylformamidine substituents were isolated as individual compounds. Dichlorophosphoranide 9 was prepared by the multicomponent reaction of C-trimethylsilyl-N,N-dimethyl-N′-phenylformamidine and N,N-dimethyl-N′-phenylformamidine with phosphorus trichloride. Its molecular structure derived from a single-crystal X-ray diffraction was compared to the analogous dibromophosphoranide prepared previously by us by the reaction of phosphorus tribromide with N,N-dimethyl-N′-phenylformamidine. It was shown that a chlorophosphine featuring two N,N-dimethyl-N′-mesitylformamidine substituents reacted with hydrogen chloride to form dichlorophosphoranide 11. Its molecular structure was also determined by X-ray analysis and compared with that of closely related dichlorophosphoranide C.
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6

Jeong, Jaeki, Haeyeon Kim, Yung Jin Yoon, Bright Walker, Seyeong Song, Jungwoo Heo, Song Yi Park, Jae Won Kim, Gi-Hwan Kim, and Jin Young Kim. "Formamidinium-based planar heterojunction perovskite solar cells with alkali carbonate-doped zinc oxide layer." RSC Advances 8, no. 43 (2018): 24110–15. http://dx.doi.org/10.1039/c8ra02637h.

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7

Enomoto, Ayu, Atsushi Suzuki, Takeo Oku, Sakiko Fukunishi, Tomoharu Tachikawa, and Tomoya Hasegawa. "First-principles calculations and device characterizations of formamidinium-cesium lead triiodide perovskite crystals stabilized by germanium or copper." Japanese Journal of Applied Physics 62, SK (April 14, 2023): SK1015. http://dx.doi.org/10.35848/1347-4065/acc6d8.

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Abstract To avoid formation of the photo-inactive δ-phase of formamidinium-cesium lead triiodide, copper or germanium was added to the perovskite compounds to stabilize the photoactive α-phase. It was found that the substitution of lead by germanium (Ge) or copper (Cu) provided the stabilization of the α-phase in the present work. The first-principles molecular dynamics calculations indicated that displacements of formamidinium molecules were suppressed by the Ge doping. X-ray diffraction results indicated that the Ge or Cu doping of the perovskite compounds could be effective for suppression the phase transition from α- to δ-phase.
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8

Szostak, Rodrigo, Paulo Ernesto Marchezi, Adriano dos Santos Marques, Jeann Carlos da Silva, Matheus Serra de Holanda, Márcio Medeiros Soares, Hélio Cesar Nogueira Tolentino, and Ana Flávia Nogueira. "Exploring the formation of formamidinium-based hybrid perovskites by antisolvent methods: in situ GIWAXS measurements during spin coating." Sustainable Energy & Fuels 3, no. 9 (2019): 2287–97. http://dx.doi.org/10.1039/c9se00306a.

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9

Koh, Teck Ming, Thirumal Krishnamoorthy, Natalia Yantara, Chen Shi, Wei Lin Leong, Pablo P. Boix, Andrew C. Grimsdale, Subodh G. Mhaisalkar, and Nripan Mathews. "Formamidinium tin-based perovskite with low Eg for photovoltaic applications." Journal of Materials Chemistry A 3, no. 29 (2015): 14996–5000. http://dx.doi.org/10.1039/c5ta00190k.

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10

Ruan, Shuai, Rong Fan, Narendra Pai, Jianfeng Lu, Nathan A. S. Webster, Yinlan Ruan, Yi-Bing Cheng та Christopher R. McNeill. "Incorporation of γ-butyrolactone (GBL) dramatically lowers the phase transition temperature of formamidinium-based metal halide perovskites". Chemical Communications 55, № 78 (2019): 11743–46. http://dx.doi.org/10.1039/c9cc05753f.

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Дисертації з теми "Formamidinium"

1

Chen-LunLan and 藍振倫. "Stability Improvement of Low-bandgap Perovskite Solar Cell Using Formamidinium as Cation." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/3679f7.

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Анотація:
碩士
國立成功大學
微電子工程研究所
106
In this thesis, in order to improve the stability of the perovskite solar cells, we substituted original cation of typical perovskite solar cells, Methylammonium (MA) with Formamidinium (FA). Because of the higher crystallization temperature of FA perovskite solar cells, we assumed that the binding energy of FA perovskite solar cells was higher than MA perovskite solar cells, enhancing the resistance of oxide and moisture, and finally enlarging its stability. Moreover, using formamidinium as the cation can reduce the bandgap of the perovskite solar cells, which means its absorption edge shifts to longer wavelength. We can apply this type of solar cells on tandem-structure perovskite solar cells, since it can absorb near-IR wavelength light of sunlight. In addition, so as to enhance its stability further, we used lead thiocyanate (Pb(SCN)2) as additive, which can enlarge grain size and crystallinity of perovskite phase. For FA-based perovskite solar cell has a tolerance factor larger than 1, it’s difficult to form high quality black phase FAPbI3 and easy to become yellow phase, an unfavorable phase for perovskite solar cells. Therefore, adding small amount of methylammonium and lead thiocyanate can restrain perovskite from forming yellow phase and it can be confirmed by X-ray diffraction measurement. Meanwhile, since tin and lead have similar atomic arrangement, we applied tin as replacement to reduce the content of lead in perovskite solar cells with a view to being less toxicity. We partially substituted lead with tin content of 12.5%, 25%, 37.5% in this work and we observed the more tin we substituted, the lower bandgap it became. Moreover, 37.5% tin substitution provides the best alternative because of the highest efficiency and tin percentage. In the end of this thesis, we successfully improved the stability of perovskite material by using formamidinium as cation and adding lead thiocyanate in perovskite layer. Formamidinium and partially tin substitution based perovskite solar cells lead to a red shift of optical absorbance compared to methylammonium and pure lead based solar cells and we hope we can apply this type of perovskite solar cells on tandem-structure solar cells.
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2

An-ZheLiou and 劉安哲. "Fast Deposition-Crystallization Procedure for Formamidinium lead iodide inverted type planar-structured perovskite solar cell." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/q476we.

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Анотація:
碩士
國立成功大學
航空太空工程學系
103
The cubic HC(NH2)2PbI3 (FAPbI3) perovskite has the measured band gap of 1.43 eV and its corresponding absorption edge reaches 870 nm. Therefore, the material is potentially superior than the CH3NH3PbI3 (MAPbI3) as the light harvester. The current work made FAPbI3 perovskite solar cell with structure, as shown in Fig. 1a, by depositing a thin layer of FA-perovskite film with a one-step process. This is done by spin-coating of 40 wt % PbI2 : FAI (at 1:1) mixture in DMSO to get a pure FAPbI3 perovskite phase. To adopt the solvent-induced, fast crystallization process, the spin-coated film is immediately exposed to different kinds of non-solvents, such as toluene, chlorobenzene to induce crystallization. All the spin-coated films can be annealed at relatively low temperatures such that the cell can be made on a flexible substrate. Six different kinds of non-solvents, such as toluene, chlorobenzene, dichlorobenzene, 2-isopronol, chloroform, acetonitrile, were used to test the crystallization of FA-perovskite film at 160oC. It was found that the non-solvent of 2-isopronol has the best result of crystallization and coverage of entire film. The crystallization process took only 10 mins in comparison to the traditional method of annealing for two hours at 160oC. In order to improve the cell performance, the mixed solution of DMSO and GBL was used to dissolve PbI2 : FAI (at 1:1). It is found that the mixing ratio for DMSO versus GBL at 7:3 v/v has the best crystallization and coverage of the entire film, as shown in Fig. 1, leading to significant increase in the cell performance. The Jsc of the solar cell with PbI2 and FAI dissolved in the mixture of DMSO and GBL at 7:3 can increase from 9.585 to 10.249 mA/cm2 and FF from 0.421 to 0.56 and PEC from 3.228% to 4.596%, as shown in Fig. 2 for I-V characteristic measurements. Further improvement in cell performance will be discussed in the conference.
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3

Hassan, Mahmoud Mohamed Mohyeldin Mostafa, and 莫海森. "Femtosecond Transient Absorption Spectral Studies of the Carrier Relaxation Dynamics of Formamidinium Tin Iodide Thin films and the effects of varied additives." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/yaf6n5.

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Анотація:
碩士
國立交通大學
應用化學系碩博士班
106
Our study mainly focuses on the effects of additives on the optical properties and carrier generation and carrier recombination mechanisms of formamidinium tin iodide perovskites. The additives are bulkier organic cations like ethyl diammonium diiodide (EDAI2) and butyl ammonium iodide (BAI), passivate the crystal surface, control the film morphology and improve the crystallinity for the FASnI3 PSC. Though passivation effects can be visualized by optical imaging techniques like scanning emission microscopy and the subsequent photo conversion efficiency improvements of solar cells fabricated with passivated thin films, the actual microscopic picture on the mechanism of charge transport and band gap changes can only be accessed through steady state and ultrafast time-resolved absorption spectroscopy. Here, we present the band gap changes between pristine FASnI3 sample and added additive samples using steady state UV-Vis, PL spectroscopy and carrier generation/relaxation mechanisms by using ultrafast femtosecond transient absorption spectroscopic experiments performed on the all the samples under similar experimental conditions. Exciton formation from hot carriers were detected for all the samples measured due to the so-called phonon bottle neck effect. Laser fluence studies reveal that exciton formation or onset of photoinduced absorption is delayed due to the increase of hot carrier densities and carrier-carrier interactions in conduction and valence bands. Band broadening and blue shifts is also observed in the laser fluence studies confirms band filling effect due to accumulation of charge carriers in the conduction and valence bands. The estimated carrier cooling rates indicates that additives delay the cooling of hot carriers and thereby retard the recombination of carrier relaxation processes. Thus, the reasons for the retardation of fluorescence lifetimes of the samples with additives might be due to retardation of hot carrier cooling and there by re-generation and decays of hot excitons at slower rates. A kinetics study on carrier relaxation and transport processes and their device efficiencies will be presented and compared with those of their Pb-based analogues. Such a time-resolved information obtained in the present study would help us to design Sn-based perovskite solar cells with greater device performance.
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4

Pariari, Debasmita. "Opto-electronic Properties of a Few Dimensionally Controlled Hybrid Halides and Related Systems." Thesis, 2022. https://etd.iisc.ac.in/handle/2005/6183.

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To mitigate the adverse environmental effects of burning fossil fuels, it became necessary to explore alternative ‘clean’ renewable energy sources to meet the ever-increasing energy demands. While silicon-based solar cell devices have been at the forefront for decades, recently organic-inorganic hybrid halide perovskites APbX3 [A = methylammonium (MA+), formamidinium (FA+); X = halides] have transpired as a new family of materials as the alternatives, owing to their exceptional optoelectronic properties such as tuneable bandgap, low exciton binding energy, high carrier mobility, high defect tolerance etc. Remarkably, the efficiency of these solar cells with hybrid perovskites as the active layer has shot up from 3.8% in 2009 to exceed 25% at present. However, the environmental stability of the given materials remains elusive, placing a considerable hurdle on the way to its commercialization. Compositional engineering by partially substituting ‘A-site’ (MA+ with FA+) and/or ‘X-site’ (I- with Br-) ions of the perovskite have proven to be one of the successful approaches to enhance the stability of these materials. More recently, reasonable success in increasing environmental stability is achieved by incorporating bulkier and hydrophobic organic cations at the ‘A-site’, resulting in 2D layered counterparts with enhanced bandgap and exciton binding energy. In this thesis work, we have explored the opto-electronic and thermal properties of dimensionally controlled 2D as well as compositionally engineered 3D hybrid halide systems. In addition to the solar energy, hydrogen evolution reaction (HER) has a great significance in promoting electrochemical energy conversion in fuel cells. Being one of the most efficient catalysts for HER, MoS2 – the flagship member of the 2D layered transition metal dichalcogenides family, has gained much attention recently. We have also discussed the electronic structure of MoS2, responsible for such novel applications.
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Частини книг з теми "Formamidinium"

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Fairbanks, Teresa G., Chris L. Andrus, and David D. Busath. "Lorentzian Noise in Single Gramicidin A Channel Formamidinium Currents." In Novartis Foundation Symposium 225 - Gramicidin and Related Ion Channel-Forming Peptides, 74–92. Chichester, UK: John Wiley & Sons, Ltd., 2007. http://dx.doi.org/10.1002/9780470515716.ch6.

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2

Diaper, C. M. "Addition of Alkoxides to Uronium and Formamidinium Salts." In Four Carbon-Heteroatom Bonds, 1. Georg Thieme Verlag KG, 2005. http://dx.doi.org/10.1055/sos-sd-018-01445.

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3

Rudorf, W. D. "Reaction of 3-Aminoprop-2-enethiones with -(1-Chloroalkylidene)formamidinium Perchlorates." In Six-Membered Hetarenes with One Chalcogen, 1. Georg Thieme Verlag KG, 2003. http://dx.doi.org/10.1055/sos-sd-014-00776.

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4

Diaper, C. M. "Tetrakis(dialkylamino)methanes from Formamidinium Salts by Addition of Metalated Dialkylamines." In Four Carbon-Heteroatom Bonds, 1. Georg Thieme Verlag KG, 2005. http://dx.doi.org/10.1055/sos-sd-018-01504.

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Тези доповідей конференцій з теми "Formamidinium"

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Borchert, Juliane, Rebecca L. Milot, Jay B. Patel, Christopher L. Davies, Adam D. Wright, Laura Martínez Maestro, Henry J. Snaith, Laura M. Herz, and Michael B. Johnston. "Co-evaporated Formamidinium Lead Iodide Solar Cells." In 10th International Conference on Hybrid and Organic Photovoltaics. Valencia: Fundació Scito, 2018. http://dx.doi.org/10.29363/nanoge.hopv.2018.028.

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2

Dirin, Dmitry, Anna Vivani, Maryna Bodnarchuk, Ihor Cherniukh, Antonietta Guagliardi, and Maksym Kovalenko. "Trap-states in monodisperse formamidinium tin iodide nanocrystals." In Internet Conference for Quantum Dots. València: Fundació Scito, 2020. http://dx.doi.org/10.29363/nanoge.icqd.2020.047.

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3

Itskos, Grigorios, Paris Papagiorgis, Andreas Manoli, Andreas Othonos, Maryna Bodnarchuk, and Maksym Kovalenko. "Stimulated Emission in Formamidinium Lead Iodide Perovskite Nanocrystals." In nanoGe International Conference on Perovskite Solar Cells, Photonics and Optoelectronics. València: Fundació Scito, 2018. http://dx.doi.org/10.29363/nanoge.nipho.2019.050.

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4

Nonomura, Ren, Takeo Oku, Iori Ono, Atsushi Suzuki, Masanobu Okita, Sakiko Fukunishi, Tomoharu Tachikawa, and Tomoya Hasegawa. "Effects of Cesium/Formamidinium Co-Addition to Perovskite Solar Cells." In ASEC 2022. Basel Switzerland: MDPI, 2022. http://dx.doi.org/10.3390/asec2022-13789.

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5

Savill, Kimberley, Matthew Klug, Rebecca Milot, Henry Snaith, and Laura Herz. "Charge-Carrier Cooling and Polarization Memory Loss in Formamidinium Tin Triiodide." In 2nd nanoGe International Conference on Perovskite Thin Film Photovoltaics and Perovskite Photonics and Optoelectronics. València: Fundació Scito, 2019. http://dx.doi.org/10.29363/nanoge.nipho.2020.007.

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6

Dirin, Dmitry, Maryna Bodnarchuk, Marios Zacharias, Ihor Cherniukh, Sergii Yakunin, Federica Bertolotti, Marcel Aebli, et al. "Intrinsic formamidinium tin iodide nanocrystals by suppressing the Sn(IV) impurities." In International Conference on Emerging Light Emitting Materials. València: FUNDACIO DE LA COMUNITAT VALENCIANA SCITO, 2022. http://dx.doi.org/10.29363/nanoge.emlem.2022.004.

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Dirin, Dmitry, Maryna Bodnarchuk, Marios Zacharias, Taras Sekh, Ihor Cherniukh, Sergii Yakunin, Federica Bertolotti, et al. "Intrinsic formamidinium tin iodide nanocrystals by suppressing the Sn(IV) impurities." In MATSUS23 & Sustainable Technology Forum València (STECH23). València: FUNDACIO DE LA COMUNITAT VALENCIANA SCITO, 2022. http://dx.doi.org/10.29363/nanoge.matsus.2023.246.

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Dirin, Dmitry, Maryna Bodnarchuk, Marios Zacharias, Ihor Cherniukh, Sergii Yakunin, Federica Bertolotti, Marcel Aebli, et al. "Intrinsic formamidinium tin iodide nanocrystals by suppressing the Sn(IV) impurities." In Sustainable Metal-halide perovskites for photovoltaics, optoelectronics and photonics. València: FUNDACIO DE LA COMUNITAT VALENCIANA SCITO, 2022. http://dx.doi.org/10.29363/nanoge.sus-mhp.2022.029.

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9

Subedi, Biwas, Lei Guan, Yue Yu, Kiran Ghimire, Prakash Uprety, Maxwell M. Junda, Yanfa Yan, and Nikolas J. Podraza. "Formamidinium + Cesium Lead Triiodide Perovskite Thin Films: Optical Properties and Devices." In 2018 IEEE 7th World Conference on Photovoltaic Energy Conversion (WCPEC) (A Joint Conference of 45th IEEE PVSC, 28th PVSEC & 34th EU PVSEC). IEEE, 2018. http://dx.doi.org/10.1109/pvsc.2018.8547384.

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Lavén, Rasmus, Michael Marek Koza, Lorenzo Malavasi, Adrien Perrichon, Markus Appel, and Maths Karlsson. "Neutron spectroscopy studies of organic cation dynamics in formamidinium lead iodide perovskites." In Online Conference on Atomic-level Characterisation of Hybrid Perovskites. València: Fundació Scito, 2022. http://dx.doi.org/10.29363/nanoge.hpatom.2022.005.

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