期刊
ACS APPLIED MATERIALS & INTERFACES
卷 10, 期 30, 页码 25372-25383出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.8b06616
关键词
perovskite solar cell; passivation; melamine; melaminium iodide; hysteresis; stability; preferred orientation
资金
- National Research Foundation of Korea (NRF) grants - Ministry of Science, ICT Future Planning (MSIP) of Korea [NRF-2012M3A6A7054861, NRF-2014M3A6A7060583, NRF-2016M3D1A1027663, NRF-2016M3D1A1027664]
- Basic Science Research Program through the NRF [2016R1A2B300884, NRF-2017H1A2A1046990]
Surface passivation of perovskite grains is one of the promising methods to reduce recombination and improve stability of perovskite solar cells (PSCs). We herein report the effect of a melaminium iodide additive on the photovoltaic performance of PSCs based on (FAPbI(3))(0.875)(CsPbBr3)(0.)(125) perovskite. Cyclic -C=N- and primary amine in melamine are a good hydrogen bond acceptor and Lewis base, which can interact with both the organic cation and Lewis acidic lead iodide in the perovskite film. Melaminium iodide is synthesized and added to the precursor solution, which is directly spin-coated to form the perovskite film. The presence of melaminium iodide additive reduces the trap density from 1.02 X 10(16) to 0.645 X 10(16) cm(-3), which leads to the reduction of nonradiative recombination and thereby improving the mean open-circuit voltage and the fill factor from 1.054 to 1.095 V and from 0.693 to 0.725 V, receptively. In addition, photocurrent-voltage hysteresis is reduced by the melaminium iodide additive, which results in an enhanced average power conversion efficiency, obtained from reverse and forward scanned data, from 15.86 to 17.32%. Time-resolved photoluminescence confirms that melaminium iodide plays a more important role in passivating the rear surface of the perovskite layer contacting the hole transporting spiro-MeOTAD layer. An aging test under a relative humidity of 65% reveals that melaminium iodide improves stability because of the suppression of the defect evolved by moisture.
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