Stable and efficient air-processed perovskite solar cells employing low-temperature processed compact In2O3 thin films as electron transport materials

JOURNAL OF ALLOYS AND COMPOUNDS

卷:836

Article

Zhang, Xiaoqing^1,5  Li, Jingling^1,2  Bi, Zhuoneng^1,3  He, Kun¹  Xu, Xueqing¹  Xiao, Xiudi¹  Zhu, Yanqing¹  Zhan, Yongjun¹  Zhong, Liuwen¹  Xu, Gang¹  Yu, Huangzhong⁴ 

[1] Chinese Acad Sci, Guangzhou Inst Energy Convers, Key Lab Renewable Energy, Guangdong Key Lab New & Renewable Energy Res & De, Guangzhou 510640, Peoples R China

[2] Foshan Univ, Sch Mat Sci & Energy Engn, Foshan 528000, Peoples R China

[3] Univ Chinese Acad Sci, Ctr Mat Sci & Optoelect Engn, Beijing 100049, Peoples R China

[4] South China Univ Technol, Sch Phys & Optoelect, Guangzhou 510640, Peoples R China

[5] South China Univ Technol, Sch Mech & Automot Engn, Guangzhou 510640, Peoples R China

关键词: Acetylacetone;    Low-temperature fabrication;    Compact In2O3 thin film;    Electron transporting layer;    Air-processed perovskite solar cells;   

DOI  :  10.1016/j.jallcom.2020.155460

来源: Elsevier

【 摘 要 】

Perovskite solar cells (PSCs) have achieved remarkable power conversion efficiencies (PCEs) owing to their extraordinary optoelectronic properties. Electron transporting layer (ETL) has been proved to have a significant influence on the photovoltaic performance and stability of cell devices. Herein, for the first time, we prepare a low-temperature processed compact In2O3 film derived from a highly stable modified indium precursor solution as a promising ETL for stable and efficient air-processed PSCs. The addition of acetylacetone as a chelation ligand in the solution effectively inhibits the hydrolysis reactions by chelating In3+, thus contributing to the formation of compact In2O3 film at a low temperature of 200 degrees C. Dense CH3NH3PbI3 perovskite films with many microns-scale grains are fabricated using a scalable doctor-blade method under a harsh ambient condition (relative humidity of 40-50%). Using the proposed compact In2O3 film as ETL, the electron extraction and charge transport at the ETL/perovskite interface are significantly improved. As a result, the air-processed PSC based on compact In2O3 film delivers a champion PCE of 13.97%, greatly outperforming the device with a pristine In2O3 film (9.81%). In addition to high efficiency, the PSC incorporating proposed compact In2O3 film exhibits an excellent long-term stability, maintaining 94% of its initial PCE after stored in air for 31 days. This study demonstrates the feasibility of fabricating stable and efficient air-processed PSCs using low-temperature processed In2O3 ETL, which is expected to have a positive impact in the manufacturing community of solution-processed In2O3 film as well as air-processed PSCs. (C) 2020 Elsevier B.V. All rights reserved.

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