Affiliation:
1. Department of Materials Science and Engineering Southern University of Science and Technology (SUSTech) Shenzhen Guangdong 518055 China
2. Center for Advanced Analytical Science Guangzhou Key Laboratory of Sensing Materials and Devices Guangdong Engineering Technology Research Center for Photoelectric Sensing Materials and Device c/o School of Chemistry and Chemical Engineering Guangzhou University Guangzhou Guangdong 510006 China
3. Institute of Nanoscience and Applications Department of Electrical and Electronic Engineering Southern University of Science and Technology Shenzhen 518055 China
Abstract
Dopant‐free hole transport layers (HTLs) play a crucial role in achieving high‐efficiency and stable perovskite solar cells (PSCs). However, only a limited number of these HTLs have demonstrated power conversion efficiencies (PCEs) surpassing 21%. Herein, the design and synthesis of two polymeric HTLs with a novel DA’D–A backbone are presented. The incorporation of two A units (benzothiazole and imide functionalized aromatics) in the polymer imparts a rigid backbone, high mobility, appropriate film morphology, excellent thermal stability, and a deeper highest occupied molecular orbital energy level, crucial for achieving a more suitable energy‐level alignment between HTL and perovskite layer. Notably, the champion PSC based on our HTLs exhibits a remarkable PCE of 22.02% with minimal hysteresis and excellent thermal stability, surpassing the performance of devices based on the benchmark polymeric HTL PTAA under identical conditions. These findings underscore the immense potential of our DA’D‐A backbone strategy in developing high‐performance dopant‐free polymer HTLs for enhancing the PCE of PSCs.
Funder
Natural Science Foundation of Guangdong Province for Distinguished Young Scholars
Science, Technology and Innovation Commission of Shenzhen Municipality
National Natural Science Foundation of China
Subject
Electrical and Electronic Engineering,Energy Engineering and Power Technology,Atomic and Molecular Physics, and Optics,Electronic, Optical and Magnetic Materials