Toward improved stability of nonfullerene organic solar cells: Impact of interlayer and built‐in potential
Weixia Lan,
Jialu Gu,
Shiwei Wu,
Yan Peng,
Min Zhao,
Yingjie Liao,
Tao Xu,
Bin Wei,
Liming Ding,
Furong Zhu
Affiliations
Weixia Lan
School of Mechatronic Engineering and Automation Shanghai University Shanghai China
Jialu Gu
School of Mechatronic Engineering and Automation Shanghai University Shanghai China
Shiwei Wu
School of Mechatronic Engineering and Automation Shanghai University Shanghai China
Yan Peng
School of Mechatronic Engineering and Automation Shanghai University Shanghai China
Min Zhao
Key Laboratory of Interface Science and Engineering in Advanced Materials, Ministry of Education Taiyuan University of Technology Taiyuan China
Yingjie Liao
School of Mechatronic Engineering and Automation Shanghai University Shanghai China
Tao Xu
School of Mechatronic Engineering and Automation Shanghai University Shanghai China
Bin Wei
School of Mechatronic Engineering and Automation Shanghai University Shanghai China
Liming Ding
Center for Excellence in Nanoscience (CAS), Key Laboratory of Nanosystem and Hierarchical Fabrication (CAS) National Center for Nanoscience and Technology Beijing China
Furong Zhu
Department of Physics, Research Centre of Excellence for Organic Electronics Hong Kong Baptist University Kowloon Tong Hong Kong China
Abstract Improved efficiency and stability of the organic solar cells (OSCs) are the critical considerations for practical applications. The interface between the interlayer and bulk heterojunction has recently been shown as one of the weak links associated with the degradation in the nonfullerene acceptor (NFA)‐based OSCs. It shows that the removal of the interfacial chemical reactions between the 2‐(3‐oxo‐2,3‐dihydroinden‐1‐ylidene)malononitrile (INCN) moieties in NFA and poly(3,4‐ethylenedioxythiophene)‐polystyrene sulfonate (PEDOT:PSS) hole extraction layer (HEL) is desired for enhancing the device stability. In this work, we show that the use of a bilayer MoO3/antimonene HEL favors the operational stability in OSCs through maintaining a high built‐in potential and suppression of an undesired interfacial reaction between INCN moieties in NFA and the PEDOT structures in PEDOT:PSS. A power conversion efficiency of 16.68% is also obtained for the OSCs with a bilayer MoO3/antimonene HEL, prepared using a blend system of PM6:Y6, demonstrating its suitability for high‐performance OSCs.
