De-doping buried interface in p-i-n perovskite solar cells by utilizing compositional heterogeneity in depth

被引:22
作者
Ma, Yue [1 ]
Song, Qizhen [1 ]
Yang, Xiaoyan [1 ]
Zai, Huachao [2 ,3 ]
Yuan, Guizhou [1 ]
Zhou, Wentao [2 ]
Chen, Yihua [1 ]
Pei, Fengtao [1 ]
Kang, Jiaqian [4 ]
Wang, Hao [1 ,5 ]
Song, Tinglu [1 ]
Wang, Xueyun [4 ]
Zhou, Huanping [2 ]
Li, Yujing [1 ]
Bai, Yang [1 ]
Chen, Qi [1 ]
机构
[1] Beijing Inst Technol, Expt Ctr Adv Mat, Sch Mat Sci & Engn, Beijing 100081, Peoples R China
[2] Peking Univ, Sch Mat Sci & Engn, Beijing Key Lab Theory & Technol Adv Battery Mat, Key Lab Polymer Chem & Phys,Minist Educ,BIC,ESAT, Beijing 100871, Peoples R China
[3] China Univ Geosci Beijing, Sch Mat Sci & Technol, Beijing 100083, Peoples R China
[4] Beijing Inst Technol, Sch Aerosp Engn, Beijing 100081, Peoples R China
[5] Chongqing Innovat Ctr, Beijing Inst Technol, Chongqing 401120, Peoples R China
基金
中国博士后科学基金;
关键词
Perovskite; High efficiency; Self-doping; Work function; Stability; SURFACE TERMINATION; INTRINSIC DEFECTS; LEAD; PERFORMANCE; EFFICIENT; PASSIVATION; FILMS; PBI2;
D O I
10.1016/j.nanoen.2023.108250
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Compositional heterogeneity in halide perovskite materials often leads to undesired physiochemical properties of the materials that hampers device efficiency and stability. In a perovskite film prepared via conventional 2-step method, we find excess PbI2 are prone to locate at surface and buried interfaces, resulting in negative-type selfdoping. To tailor this band alignment unfavored for p-i-n devices, we pre-deposited pyrrolidinium hydroiodide to react with residual PbI2 at buried interface. It not only de-dopes the perovskite to obtain the desired band alignment, but also passivates negative-type defects, which improves the device efficiency and stability. Consequently, the target planar p-i-n PSCs achieve an efficiency of 24.5 % (certified 23.2 %) and a remarkable photostability with 13 % efficiency decline for 2800 h under 1-Sun white LED illumination. It is so far among the highest-efficiency p-i-n PSCs via 2-step fabrication. Therefore, we suggest an interface de-doping strategy to fabricate highly efficient and stable PSCs.
引用
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页数:8
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