Synergetic surface charge transfer doping and passivation toward high efficient and stable perovskite solar cells

Xing Guo; Jie Su; Zhenhua Lin; Xinhao Wang; Qingrui Wang; Zebing Zeng; Jingjing Chang; Yue Hao

doi:10.1016/j.isci.2021.102276

Synergetic surface charge transfer doping and passivation toward high efficient and stable perovskite solar cells

iScience. 2021 Mar 5;24(4):102276. doi: 10.1016/j.isci.2021.102276. eCollection 2021 Apr 23.

Authors

Xing Guo¹, Jie Su^{1

2}, Zhenhua Lin¹, Xinhao Wang³, Qingrui Wang¹, Zebing Zeng³, Jingjing Chang^{1

2}, Yue Hao^{1

2}

Affiliations

¹ State Key Discipline Laboratory of Wide Band Gap Semiconductor Tecchnology, Shaanxi Joint Key Laboratory of Graphene, School of Microelectronics, Xidian University, 2 South Taibai Road, Xi'an 710071, China.
² Advanced Interdisciplinary Research Center for Flexible Electronics, Xidian University, 2 South Taibai Road, Xi'an 710071, China.
³ State Key Laboratory of Chemo/Biosensing and Chemometrics, Hunan University, Changsha 410082, P. R. China.

Abstract

Organic-inorganic lead halide perovskite solar cells (PSCs) have received much attention in the last few years due to the high power conversion efficiency (PCE). Generally, perovskite/charge transport layer interface and the defects at the surface and grain boundaries of perovskite film are important factors for the efficiency and stability of PSCs. Herein, we employ an extended benzopentafulvalenes compound (FDC-2-5Cl) with electron-withdrawing pentachlorophenyl group and favorable energy level as charge transfer molecule to treat the perovskite surface. The FDC-2-5Cl with pentachlorophenyl group could accept the electrons from perovskite as a p-type dopant, and passivate the surface defects. The p-type doping effect of FDC-2-5Cl on perovskite surface induced band bending at perovskite surface, which improves the hole extraction from perovskite. As a result, the PSC with FDC-2-5Cl treatment achieves a PCE of 21.16% with an enhanced open-circuit voltage (V _oc) of 1.14 V and outstanding long-term stability.

Keywords: Energy Engineering; Energy Materials; Surface Treatment.