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, ...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.展开更多
基金supported by the National Key Research and Development Program of China (2016YFA0202400)the 111 Project (B16016)+2 种基金the National Natural Science Foundation of China (51572080, 51702096 and U1705256)the Fundamental Research Funds for the Central Universities (2018ZD07, 2017MS021 and 2019MS027)the Double Top Construction Program of North China Electric Power University (XM1805314)
文摘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.
