Key Laboratory of Applied Surface and Colloid ChemistryMinistry of EducationShaanxi Key Laboratory for Advanced Energy DevicesShaanxi Engineering Lab for Advanced Energy TechnologySchool of Materials Science and EngineeringShaanxi Normal UniversityXi’an 7;
关键词：
1;
FACsPbI_3;
3-thiazole-2;
high efficiency;
asymmetric modification;
4-diammonium;
perovskite solar cells;
期刊名称：
Advanced energy materials
i s s n：
1614-6832
年卷期：
2023 年
13 卷
15 期
页 码：
2204372.1-2204372.10
页 码：
摘 要：
Surmounting complicated defects at the electron transport layer (ETL) and perovskite interface plays a non-trivial role in improving efficiency and stability of perovskite solar cells (PSCs). Herein, an asymmetric interface modification strategy (AIMS) is developed to passivate the defects from both a SnO_2 ETL and the perovskite buried surface via incorporating 1,3-thiazole-2,4-diammonium (TDA) into the SnO_2/perovskite interface. Detailed experimental and calculated results demonstrate that N_3 (the nitrogen atom bonding to the imine) in the TDA preferentially cures the free hydroxyl (-OH), oxygen vacancy (VO), and the Sn-related defects on the SnO_2 surface, while N1 (the nitrogen atom bonding to the vinyl) is more inclined to passivate the Pb~（2+） and I? related defects at the perovskite buried surface. As a result, the TDA-modified FACsPbI_3 PSC yields a champion power conversion efficiency (PCE) of 24.96% with a gratifying opencircuit voltage (Voc) of 1.20 V. In addition, the optimized PSCs exhibit charming air-operational stability with the unencapsulated device sustaining 97.04% of its initial PCE after storage in air conditions for 1400 h. The encapsulated device maintains 90.21% of its initial PCE after maximum power point tracking for 500 h.
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