Synergistic Modification for Efficient Perovskite Solar Cells with Small Voltage Loss

You He; Hua Dong; Cong Chen; Feng Hao; Fei Long; Jilin Wang; Chuantian Zuo; Liming Ding

doi:10.1021/acsami.3c10430

Synergistic Modification for Efficient Perovskite Solar Cells with Small Voltage Loss

ACS Appl Mater Interfaces. 2023 Oct 26. doi: 10.1021/acsami.3c10430. Online ahead of print.

Authors

You He^{1

2}, Hua Dong³, Cong Chen⁴, Feng Hao⁵, Fei Long¹, Jilin Wang¹, Chuantian Zuo^{2

6}, Liming Ding²

Affiliations

¹ Guangxi Key Laboratory of Optical and Electronic Materials and Devices, Guilin University of Technology, Guilin 541004, China.
² Center for Excellence in Nanoscience (CAS), Key Laboratory of Nanosystem and Hierarchical Fabrication (CAS), National Center for Nanoscience and Technology, Beijing 100190, China.
³ School of Electronic Science and Engineering, Xi'an Jiaotong University, Xi'an 710049, China.
⁴ School of Material Science and Engineering, Hebei University of Technology, Tianjin 300130, China.
⁵ School of Materials and Energy, University of Electronic Science and Technology of China, Chengdu 611731, China.
⁶ Key Laboratory of Optoelectronic Chemical Materials and Devices of Ministry of Education, Jianghan University, Wuhan 430056, China.

PMID: 37882603
DOI: 10.1021/acsami.3c10430

Abstract

The power conversion efficiency (PCE) of perovskite solar cells has improved quickly in the past few years, but the PCE is still much lower than the theoretical limit. The relatively high energy loss (E_loss) is one of the critical factors limiting the PCE. To resolve the above issues, a synergistic modification strategy was used herein to minimize E_loss. RbCl and potassium polyacrylate (K-PAM) were used to modify the SnO₂ layer. Additionally, Pb(Ac)₂ was introduced into PbI₂ to further improve the film quality. The synergistic modification strategy reduced the defects in SnO₂ and perovskite and improved the energy-level alignment, enabling significantly reduced E_loss and enhanced photovoltaic performance. The best PCE of 24.07% was achieved, which was much higher than that of the control device (20.86%). The E_loss was only 0.349 eV for the target device. Good stability was achieved for the cells made using modified SnO₂ and perovskite layers.

Keywords: defect passivation; energy loss; interfacial modification; perovskite solar cells; two-step method.