Pioneering Interface Configuration with Fermi‐Level Tailoring for Tin Perovskite Photovoltaics
Abstract
Abstract Tin‐based perovskite solar cells (TPSCs) have attracted attention for their environmentally friendly and high theoretical efficiency. However, their current efficiency remains substantially lower than that of lead‐based devices, which due to nonideal film quality and interfacial energy level mismatch. In the inverted structure, conventional hole transport materials, PEDOT:PSS, exhibits nonideal energy level alignment with perovskite, leading to carrier accumulation and recombination. Here, we designed and synthesized a carbazole‐based phosphonic acid self‐assembled monolayer with terminal methylthio groups, which was introduced beneath PEDOT:PSS to construct a composite hole transport layer structure. This architecture, enabled by methylthio groups linkages that ensured intimate interfacial contact and improved energy‐level alignment, effectively suppressed recombination losses and facilitated more efficient hole extraction. Consequently, the optimized device achieved an impressive power conversion efficiency of 15.11% along with excellent operational stability under various conditions. This work provides new insights into interfacial fermi‐level tailoring, paving the way for high‐performance TPSCs.
Article Details
Authors (13)
Yu‐Tong Yang
Institute of Functional Nano & Soft Materials (FUNSOM) State Key Laboratory of Bioinspired Interfacial Materials Science Soochow University Suzhou China
Chun‐Hui Su
State Key Laboratory of Bioinspired Interfacial Materials Science Institute of Functional Nano & Soft Materials (FUNSOM) Soochow University Suzhou 215123 China
Kai Jin
Yan‐Hui Lou
College of Energy Soochow Institute for Energy and Materials Innovations Soochow University Suzhou China
Xiao‐Yu Rong
State Key Laboratory of Bioinspired Interfacial Materials Science Institute of Functional Nano & Soft Materials (FUNSOM) Soochow University Suzhou 215123 China
Chun‐Hao Chen
Institute of Functional Nano & Soft Materials (FUNSOM) State Key Laboratory of Bioinspired Interfacial Materials Science Soochow University Suzhou China
Jing Chen
Xin Chen
Kai‐Li Wang
Institute of Functional Nano & Soft Materials (FUNSOM) State Key Laboratory of Bioinspired Interfacial Materials Science Soochow University Suzhou China
Yu Xia
Lei Huang
BLSA-ZJU Research Center and Key Laboratory of Biomass Chemical Engineering of Ministry of Education, College of Chemical and Biological Engineering, Zhejiang University, Hangzhou, China.
Jian Fan
Zhao‐Kui Wang
Institute of Functional Nano & Soft Materials (FUNSOM) State Key Laboratory of Bioinspired Interfacial Materials Science Soochow University Suzhou China