Stabilizing Bottom Side of Perovskite via Preburying Cesium Formate toward Efficient and Stable Solar Cells

被引：30

作者：

Deng, Liangliang ^{[1
]}

Wang, Haoliang ^{[1
]}

Rafique, Saqib ^{[1
]}

Wang, Yanyan ^{[1
]}

Hu, Tianxiang ^{[1
]}

Liu, Kai ^{[1
]}

Wang, Yaxin ^{[1
]}

Li, Xiaoguo ^{[1
]}

Xie, Zuoti ^{[2
]}

Tang, Jun ^{[3
]}

Liu, Zhe ^{[4
]}

Li, Jinpeng ^{[3
]}

Yuan, Wei ^{[5
]}

Wang, Jiao ^{[1
]}

Yu, Anran ^{[1
]}

Zhan, Yiqiang ^{[1
]}

机构：

[1] Fudan Univ, Ctr Micronano Syst, Sch Informat Sci & Technol, Shanghai 200438, Peoples R China

[2] Guangdong Technion Israel Inst Technol, Dept Mat Sci & Engn, MATEC, 241 Daxue Rd, Shantou 515063, Guangdong, Peoples R China

[3] Beijing Jiaotong Univ, Sch Phys Sci & Engn, Key Lab Luminescence & Opt Informat, Minist Educ, Beijing 100044, Peoples R China

[4] Beijing Inst Technol, Sch Opt & Photon, Beijing 100081, Peoples R China

[5] Fudan Univ, Inst Optoelect, 2005 Songhu Rd, Shanghai 200438, Peoples R China

来源：

ADVANCED FUNCTIONAL MATERIALS | 2023年 / 33卷 / 43期

基金：

中国国家自然科学基金;

关键词：

bottom side; cesium formate; operational stability; perovskite solar cells; strains; STRAIN RELAXATION; PERFORMANCE; INTERFACES;

D O I：

10.1002/adfm.202303742

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

The fragile bottom side of perovskite films is demonstrated to be harmful to the efficiency and stability of perovskite solar cells (PSCs) because the carrier extraction and recombination can be significantly influenced by the easily formed strain, voids, and defects on the bottom side. Nevertheless, the bottom side of perovskite films is usually overlooked because it remains a challenge to directly characterize and modify the bottom side. Herein, a facile and effective strategy is reported to stabilize the bottom side via preburying cesium formate (CsFo) into the SnO2 electron transport layer (ETL). It is found that the synergistic effect of cesium cation (Cs+) and formate anion (HCOO-) causes strain relaxation, void elimination, and defects' reduction, which further facilitate the charge extraction. Consequently, the champion power conversion efficiency (PCE) of formamidinium (FA)-based PSCs is increased from 23.34% to 24.50%. Meanwhile, the ultraviolet (UV), thermal, and operational stability are also enhanced. Finally, formamidinium-cesium (FACs)-based PSCs are investigated to confirm the effectiveness of this preburied CsFo strategy, and the optimal device exhibits a champion PCE of 25.03% and a remarkably high fill factor (FF) of 85.65%.

引用

页数：10

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