Improving the performance of perovskite solar cells by surface passivation

• 作者: Wenbin Han Guanhua Ren Zhiqi Li Minnan Dong Chunyu Liu Wenbin Guo
• 来源期刊: 能源化学
• 年，卷（期）: 2020,（7）
• 页码范围: 202-207
• 页数: 6页
• 语种: 英文

摘要

NiO has a perfect-aligned energy level with CH3NH3PbI3 perovskite such that it serves as a hole transport layer (HTL), but NiO-based perovskite solar cells (PSCs) still suffer from low efficiency due to the poor in-terface contact between the perovskite layer and the NiO HTL, and haphazardly stacked perovskite grains. Herein, poly[(9,9-dioctylfluorenyl-2,7-diyl)-alt-co-(1,4-benzo-{2,1',3}-thiadiazole)] (PFBT) is introduced be-tween the NiO and perovskite layers in the form of a polymer aggregate to enhance perovskite crys-tallinity and decrease the interface charge recombination between perovskite and NiO in PSCs, resulting in an improved performance. Moreover, PFBT modified perovskite films showed sharper, smoother, and more compact crystalline grains with fewer grain boundaries, leading to the decreased nonradiative re-combination. This study offers a simple strategy to achieve highly efficient PSCs with the incorporation of polymer semiconductor aggregates to passivate the interface between the perovskite and NiO layers.