An amino-substituted perylene diimide polymer for conventional perovskite solar cells

作者：Zhang, Mingyu; Li, Tengfei; Zheng, Guanhaojie; Li, Liang; Qin, Meng; Zhang, Shiming; Zhou, Huanping^*; Zhan, Xiaowei^*

来源：Materials Chemistry Frontiers, 2017, 1(10): 2078-2084.

DOI：10.1039/c7qm00221a

• ORGANOMETAL HALIDE PEROVSKITES
• ELECTRON-TRANSPORT LAYER
• FULLERENE DERIVATIVES
• LOW-TEMPERATURE
• PERFORMANCE
• EFFICIENCY
• STABILITY
• HYSTERESIS
• TIO2

We design and synthesize an amino-functionalized conjugated polymer (PPDI-F3N) based on perylene diimide and use it as a multifunctional interfacial layer of TiO2/perovskite in conventional planar perovskite solar cells. The work function of TiO2 is modulated by PPDI-F3N to better align with the conduction band of the perovskite, leading to efficient charge extraction. PPDI-F3N can passivate the TiO2 surface to reduce the severe recombination loss and rapid degradation caused by oxygen vacancies on the UV-sensitive TiO2 surface. Moreover, modulated polarity of PPDI-F3N is beneficial to optimal perovskite crystallization and morphology. All these features contribute to a higher efficiency (18.3%) of the PSCs with the PPDI-F3N interlayer relative to the control devices without the interlayer (16.7%) as well as improved stability and a reduced hysteresis effect.

• 出版日期2017-10-1
• 单位北京大学