Multifunctional phosphonic acid additive enables efficient and stable inverted perovskite solar cells
Abstract
Achieving efficient defect passivation is crucial for enhancing both the performance and stability of perovskite solar cells (PSCs). In this study, we demonstrate that incorporating [4-(3,6-dibromo-9H-carbazol-9-yl)butyl]phosphonic acid (Br-4PACz) as a multifunctional additive into inverted PSCs significantly improves device metrics. The phosphonic acid group in Br-4PACz effectively passivates undercoordinated Pb2+ ions, thereby reducing defects and improving perovskite film quality. Furthermore, Br-4PACz optimizes energy level alignment, promoting efficient charge extraction and suppressing non-radiative recombination. As a result, the Br-4PACz-modified inverted MAPbI3 device exhibits a remarkable increase in Voc from 1.00 V to 1.10 V and in power conversion efficiency from 16.9% to 19.3%, along with enhanced moisture stability. This work underscores phosphonic acid-based molecular engineering as a promising approach for developing high-performance stable inverted PSCs.
Article Details
Journal Info
Applied Physics Letters
American Institute of Physics
Authors (10)
Junwen Liu
Institute for Environmental and Climate Research, College of Environment and Climate, Jinan University
Yapei Li
Sichuan Meteorological Optoelectronic Sensor Technology and Application Engineering Research Center, Chengdu University of Information Technology 3 , Chengdu 610225,
Hongxia Ding
Sichuan Meteorological Optoelectronic Sensor Technology and Application Engineering Research Center, Chengdu University of Information Technology 3 , Chengdu 610225,
Xingguo Chen
Optoelectronic Sensor Devices and Systems Key Laboratory of Sichuan Provincial Universities, College of Optoelectronic Engineering (Chengdu IC Valley Industrial College), Chengdu University of Information Technology 1 , Chengdu 610225,
Yongjie Wu
Hailin Yang
Ziqiao Wang
Jie Li
Dingyu Yang
Optoelectronic Sensor Devices and Systems Key Laboratory of Sichuan Provincial Universities, College of Optoelectronic Engineering (Chengdu IC Valley Industrial College), Chengdu University of Information Technology 1 , Chengdu 610225,
Xiao Wang