journal article·2022-10-14

A Universal Grain “Cage” to Suppress Halide Segregation of Mixed-Halide Inorganic Perovskite Solar Cells

Junshuai Zhang, Jialong Duan, Qiyao Guo, Qiaoyu Zhang, Yuanyuan Zhao, Hao Huang, Yanyan Duan, Qunwei Tang

ACS Energy Letters· Volume 7· Issue 10
Publisher page

Abstract

Bandgap-tunable mixed-halide perovskites offer exciting opportunities to construct efficient multijunction tandem solar cells. However, the ion migration always causes halide segregation, which inevitably creates detrimental defects and deteriorates the photovoltaic performances. Here, we report a universal caging strategy to suppress halide segregation by in situ formation of conjugated covalent organic frameworks (COFs) catalyzed by PbX2 (X = Br and I) during the formation of mixed-halide perovskite. Through theoretical calculation and systematic investigation, the strong electron-donating feature of COFs is shown to effectively solidify the soft lattice and impede the iodide ion transport from bulk to grain boundary, decelerating the light-induced halide-demixing process. Finally, the nonradiative recombination is significantly reduced, boosting efficiency up to 11.50% for an inorganic CsPbIBr2 perovskite solar cell and 14.35% for a CsPbI2Br cell with a prolonged shelf life and an improved photostability.
Source: openalex_inverted_index · Quality: baseline

Research context

OpenAlex topics: Perovskite Materials and Applications · Covalent Organic Framework Applications · Advanced Photocatalysis Techniques

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

College of Information Science Technology, Jinan University, Guangzhou 510632, PR China

Institute of Carbon Neutrality, College of Chemical and Biological Engineering, Shandong University of Science and Technology, Qingdao 266590, PR China

College of Mechanical and Electronic Engineering, Shandong University of Science and Technology, Qingdao 266590, PR China

Guangxi Key Laboratory of Processing for Non-ferrous Metals and Featured Materials, School of Resources, Environment and Materials, Guangxi University, Nanning 530004, PR China

State Centre for International Cooperation on Designer Low-Carbon and Environmental Material (SCICDLCEM), School of Materials Science and Engineering, Zhengzhou University, Zhengzhou 450001, PR China

Funding

Ministry of Science and Technology of the People's Republic of China · Central University Basic Research Fund of China · Guangzhou Science and Technology Program key projects · National Natural Science Foundation of China · Natural Science Foundation of Guangdong Province · Guangdong Basic and Applied Basic Research Foundation

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