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Ambient stable FAPbI3-based perovskite solar cells with a 2D-edapbi4 thin capping layer

Science China Materials 2020年第1期63卷 47-54页

作者： Ya-Han Wu Yong Ding Xiao-Yan Liu Xi-Hong Ding Xue-Peng Liu Xu Pan Song-Yuan Dai Beijing Key Laboratory of Novel Thin-Film Solar Cells North China Electric Power UniversityBeijing 102206China Key Laboratory of Photovolatic and Energy Conservation Materials Institute of Applied TechnologyHefei Institutes of Physical ScienceChinese Academy of SciencesHefei 230031China School of Economics and Management North China Electric Power UniversityBeijing 102206China

Two-dimensional(2D) lead halide perovskite materials are emerging as one of promising light-absorbing materials in perovskite solar cells(PSCs), which show outstanding stability and defect passivation. Unfortunately, the power conversion efficiency(PCE) of those stable 2D PSCs is still far behind that of 3D PSCs. Herein, we reported a simple in-situ growth technique for the ethylenediamine lead iodide(edapbi4) layer on the top of formamidinium lead iodide(FAPbI3) layer. The rationally designed layered architecture of2D-3 D perovskite film could improve the PCE of the PSCs. In addition, benefiting from the high moisture resistance and inhibited ion migration of edapbi4 layer, the 2D-3D-based devices showed obviously enhanced long-term stability,keeping the initial PCE value for 200 h and 90% of its initial PCE even after 500 h.

关键词： edapbi4 FAPbI3 2D-3D perovskite solar cell stability

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Bication Lead Iodide 2D Perovskite Component Stabilized Inorganic α-CsPbI3 Perovskite Phase for High-Efficiency Solar Cells

Bication Lead Iodide 2D Perovskite Component Stabilized Inor...

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第五届新型太阳能电池学术研讨会

作者： Taiyang Zhang M.Ibrahim Dar Ge Li Feng Xu Nanjie Guo Michael Gr?tzel Yixin Zhao School of Environmental Science and Engineering Shanghai Jiao Tong University

Among various all-inorganic halide perovskites exhibiting better stability than organic-inorganic halide perovskites, a-CsPbI with the most suitable band gap for tandem solar cell application faces an issue of phase instability under ambient conditions. We discovered that a small amount of two-dimensional(2D) edapbi perovskite containing the ethylenediamine(EDA) cation stabilizes the a-CsPbI to avoid the undesirable formation of the nonperovskite d phase. Moreover, not only the 2D perovskite of edapbi facilitate the formation of a-CsPbI perovskite films exhibiting high phase stability at room temperature for months and at 100 °C for >150 hours but also the a-CsPbI perovskite solar cells(PSCs)display highly reproducible efficiency of 11.8%, a record for all-inorganic lead halide PSCs. Therefore, using the bication EDA presents a novel and promising strategy to design all-inorganic lead halide PSCs with high performance and reliability.

关键词： Inorganic Perovskite edapbi4 Crosslink a-CsPbI3

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