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- W3034517811 abstract "Background: In this study, experimentally, we fabricated the FASnI 3 perovskite solar cells based on the SnF2 and SnF4-doped FASnI3 nano-thin film materials, and obtained the photoelectric conversion efficiency (PCE) as 6.5 % and 5.59 %, respectively. Theoretically, we wanted to know why the PCE of SnF2-doped FASnI 3 is higher than the SnF 4 -doped FASnI 3 . Methods: We built three kinds of model structures by the CASTEP; they were undoped and SnF2 and SnF4 doped FASnI 3 perovskite structure models, respectively. The method was ultrasoft to calculate the interaction between electron and ion, including an electron exchange correction method of generalized gradient approximation and Perdew-Burke-Emzerhof method. Results: We found the probabilities of energy transfer between SnF2 molecules and the surrounding molecules and these were found to be the lowest among the three structures. By analyzing optical properties, band structures, effective masses, and density of states (DOS), etc., we found SnF 2 doping to be superior to SnF4 doping in maintaining photoelectric properties of FASnI 3 . In addition, SnF 2- doped FASnI 3 possessed smaller hole effective mass than SnF4-doped FASnI 3 , adding Sn4+ ion into perovskite, as a shallow acceptor energy level can effectively reduce the optical absorption properties, however, adding Sn2+ ion into perovskite at an appropriate proportion enhanced photoelectric performance of FASnI 3 . Conclusion: Sn4+ doping exhibited a negative effect, while Sn2+ doping showed a positive effect in promoting the photoelectric performance of FASnI 3 perovskite. We found SnF2 doping to be superior to SnF4 doping in maintaining photoelectric properties of FASnI3. Our results may help to deeply understand the role of Sn2+ and Sn4+ ions in promoting the stability and high efficiency of FASnI 3 , and help in developing lead-free perovskite solar cells." @default.
- W3034517811 created "2020-06-19" @default.
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- W3034517811 date "2021-04-30" @default.
- W3034517811 modified "2023-09-23" @default.
- W3034517811 title "Insights into the Photoelectric Properties of the SnF2 and SnF4-doped FASnI3 Perovskite NanoFilm" @default.
- W3034517811 doi "https://doi.org/10.2174/1573413716999200609132157" @default.
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