Affiliation:
1. College of Materials Fujian Key Laboratory of Advanced Materials Xiamen Key Laboratory of Electronic Ceramic Materials and Devices Key Laboratory of High‐Performance Ceramics Fibers (Ministry of Education) Xiamen University Xiamen 361005 China
2. Institute of Flexible Electronics (IFE Future Technologies) Innovation Laboratory for Sciences and Technologies of Energy Materials of Fujian Province (IKKEM) Xiamen University Xiamen 361005 China
3. School of Chemistry and Chemical Engineering Nanjing University of Science and Technology Nanjing 210094 China
4. Shenzhen Research Institute of Xiamen University Shenzhen 518000 China
Abstract
AbstractHigh efficiency and long‐term stability are the prerequisites for the commercialization of perovskite solar cells (PSCs). However, inadequate and non‐uniform doping of hole transport layers (HTLs) still limits the efficiency improvements, while the intrinsic instability of HTLs caused by ion migration and accumulation is difficult to be addressed by external encapsulation. Here it is shown that the addition of a conjugated phosphonic acid (CPA) to the Spiro‐OMeTAD benchmark HTL can greatly enhance the device efficiency and intrinsic stability. Featuring an optimal diprotic‐acid structure, indolo(3,2‐b)carbazole‐5,11‐diylbis(butane‐4,1‐diyl) bis(phosphonic acid) (BCZ) is developed to promote morphological uniformity and mitigate ion migration across both perovskite/HTL and HTL/Ag interfaces, leading to superior charge conductivity, reinforced ion immobilization, and remarkable film stability. The dramatically improved interfacial charge collection endows BCZ‐based n‐i‐p PSCs with a champion power conversion efficiency of 24.51%. More encouragingly, the BCZ‐based devices demonstrate remarkable stability under harsh environmental conditions by retaining 90% of initial efficiency after 3000 h in air storage. This work paves the way for further developing robust organic HTLs for optoelectronic devices.
Funder
National Natural Science Foundation of China
Fundamental Research Funds for the Central Universities
Natural Science Foundation of Jiangsu Province
Basic and Applied Basic Research Foundation of Guangdong Province
Shenzhen Science and Technology Innovation Program
Subject
Mechanical Engineering,Mechanics of Materials,General Materials Science
Cited by
8 articles.
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