Abstract
Lead amine halide perovskite solar cells (PSCs) have become dominant photovoltaic research topic in this decade. Electron transport layer (ETL) play a crucial role on PSCs. Here, we use tin tetrachloride as Sn source to synthesize SnO2 nanocrystals in a simple hydrothermal method. The as-synthesized SnO2 is spin-coated on FTO substrate, and then sintered under low temperature to form the ETL of planar PSCs. The concentration of SnO2 spin-coating solution and sintering temperature have great influence on the ETL quality and charge transportation in PSCs. Through optimized treatment (0.15 M SnO2, 120 °C sintering), the high quality SnO2 ETL with a uniform coverage, appropriate thickness, less charge recombination and low resistance can be obtained. Based on the ETL, a planar PSC with FAxMA1−xPbI3 achieves a high power conversion efficiency (PCE) of 19.34%. In addition, the planar PSCs based on SnO2 exhibit a stable PCE output and slight hysteresis. These researches provide a low-cost, easy strategy to fabricate tin oxide, and present potential to replace traditional titanium oxide (TiO2) in PSCs in the future.
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Acknowledgements
The authors acknowledge the financial joint support by the National Natural Science Foundation of China (Nos. U1705256, 91422301, 51472094, 61474047).
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Yang, Y., Wu, J., Guo, P. et al. Low-temperature sintered SnO2 electron transport layer for efficient planar perovskite solar cells. J Mater Sci: Mater Electron 29, 13138–13147 (2018). https://doi.org/10.1007/s10854-018-9437-x
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DOI: https://doi.org/10.1007/s10854-018-9437-x