Modifying SnO2 with Polyacrylamide to Enhance the Performance of Perovskite Solar Cells

Haiyue Dong; Jilin Wang; Xingyu Li; Weiting Liu; Tian Xia; Disheng Yao; Lixiu Zhang; Chuantian Zuo; Liming Ding; Fei Long

doi:10.1021/acsami.2c08662

Modifying SnO₂ with Polyacrylamide to Enhance the Performance of Perovskite Solar Cells

ACS Appl Mater Interfaces. 2022 Jul 12. doi: 10.1021/acsami.2c08662. Online ahead of print.

Authors

Haiyue Dong¹, Jilin Wang^{1

2}, Xingyu Li¹, Weiting Liu¹, Tian Xia¹, Disheng Yao^{1

2}, Lixiu Zhang³, Chuantian Zuo³, Liming Ding³, Fei Long^{1

2}

Affiliations

¹ Guangxi Key Laboratory of Optical and Electronic Material and Devices, School of Materials Science and Engineering, Guilin University of Technology, 12 Jiangan Road, Guilin, Guangxi 541004, China.
² Collaborative Innovation Center for Exploration of Nonferrous Metal Deposits and Efficient Utilization of Resources, Guilin University of Technology, 12 Jiangan Road, Guilin, Guangxi 541004, China.
³ Center for Excellence in Nanoscience (CAS), Key Laboratory of Nano system and Hierarchical Fabrication (CAS), National Center for Nanoscience and Technology, Beijing 100190, China.

PMID: 35820159
DOI: 10.1021/acsami.2c08662

Abstract

Modification of the charge transport layers is an effective way to improve charge transport and performance of perovskite solar cells (PSCs). The ions in the ionic compounds used for the modification of SnO₂ may migrate into the perovskite layer, which harms the stability of PSCs. In this work, a low-cost, water-soluble nonionic polymer polyacrylamide (PAM) is used to modify SnO₂. The addition of PAM improves the uniformity, wettability, and electron mobility of the SnO₂ film. Through the modification of SnO₂, the defects of perovskite films are reduced and the grain size is increased. Furthermore, the energy-level alignment at the SnO₂/perovskite interface is improved, which is beneficial to the transfer of electrons from perovskite to SnO₂. Finally, the power conversion efficiency (PCE) of PSCs formed from modified SnO₂ is enhanced to 22.59%. More importantly, the unencapsulated devices with modified SnO₂ retain 90% of the initial value after storage for more than 1000 h under a relative humidity of 50%. These results indicate that modifying SnO₂ using PAM is a promising strategy to improve the performance of PSCs.

Keywords: SnO2 modification; charge transport; interface; nonionic polymer; polyacrylamide.