journal article·2021-04-01

Linking Phase Segregation and Photovoltaic Performance of Mixed-Halide Perovskite Films through Grain Size Engineering

Long Hu, Xinwei Guan, Weijian Chen, Yuchen Yao, Tao Wan, Chun-Ho Lin, Ngoc Duy Pham, Lin Yuan, Xun Geng, Fei Wang, Chien-Yu Huang, Jianyu Yuan, Soshan Cheong, Richard D. Tilley, Xiaoming Wen, Dewei Chu, Shujuan Huang, Tom Wu

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Abstract

Mixed-halide perovskites are attractive candidates as wide-bandgap absorber layers in tandem solar cells. However, photoinduced phase segregation leads to the formation of Br-rich and I-rich domains with uncontrolled composition and bandgap, which is considered as the main obstacle for achieving stable solar cells. Herein, we tune the grain size of CsPbBr1.5I1.5 films derived from nanocrystals and investigate the corresponding charge transport properties. The correlation between phase segregation, grain size, and the corresponding solar cell performance is unravelled. Specifically, phase segregation takes place in CsPbBr1.5I1.5 films with an average crystal size being equal to or larger than 43 nm, which consequently leads to significantly degraded performance in the solar cells with such large grains under continuous light soaking. These findings provide the highly sought-after guidelines for achieving phase-segregation-free mixed-halide perovskite films for stable optoelectronic applications.
Source: openalex_inverted_index · Quality: baseline

Research context

OpenAlex topics: Perovskite Materials and Applications · Quantum Dots Synthesis And Properties · Chalcogenide Semiconductor Thin Films

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

Affiliations

School of Engineering, Macquarie University Sustainable Energy Research Centre, Macquarie University, Sydney, New South Wales 2109, Australia

School of Materials Science and Engineering, University of New South Wales (UNSW), Sydney, New South Wales 2052, Australia

Centre for Translational Atomaterials, Swinburne University of Technology, Hawthorn 3122, Victoria Australia

Australian Centre for Advanced Photovoltaics, School of Photovoltaic and Renewable Energy Engineering, University of New South Wales (UNSW), Kensington, New South Wales 2052, Australia

Institute of Functional Nano & Soft Materials (FUNSOM), Jiangsu Key Laboratory for Carbon-Based Functional Materials and Devices, Joint International Research Laboratory of Carbon-Based Functional Materials and Devices, Soochow University, 199 Ren-Ai Road, Suzhou Industrial Park, Suzhou, Jiangsu 215123, P. R. China

Electron Microscope Unit, Mark Wainwright Analytical Centre, University of New South Wales (UNSW), Sydney, New South Wales 2052, Australia

Funding

Australian Research Council · Australian Renewable Energy Agency

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