Affiliation:
1. Key Laboratory for Biobased Materials and Energy of Ministry of Education Guangdong Laboratory for Lingnan Modern Agriculture College of Materials and Energy South China Agricultural University Guangzhou 510642 China
2. School of Chemistry and Civil Engineering Shaoguan University Shaoguan 512005 China
Abstract
AbstractHole transport layer (HTL)‐free carbon‐based perovskite solar cells (C‐PSCs) show promising commercial application potential due to their attractive advantages of low cost and high stability. However, the power conversion efficiency of C‐PSCs is relatively low, mainly due to the poor crystalline quality of the C‐PSC applicable perovskite films and the energy level mismatch between the perovskite and carbon electrode. Herein, a moisture‐induced secondary crystal growth strategy to simultaneously improve the crystalline quality and optimize the energy level of perovskite film is proposed. The presence of moisture renders the surface of perovskite grains reactive by forming metastable intermediates. It is demonstrated that the commonly considered harmful intermediates can trigger secondary crystal growth. This secondary growth strategy results in improved crystallinity, larger grain size, and better morphology of the perovskite films, which reduce the density of defect states and also benefit the interface contact between the perovskite film and carbon electrode. Furthermore, the secondary growth modulates the surface composition of the film to achieve an optimized energy level alignment. As a result, this secondary growth strategy reduces the charge recombination loss and accelerates the charge transport process in C‐PSCs. Consequently, a new record efficiency of 19.52% is achieved for HTL‐free C‐PSCs.
Funder
National Natural Science Foundation of China
Subject
Electrochemistry,Condensed Matter Physics,Biomaterials,Electronic, Optical and Magnetic Materials
Cited by
25 articles.
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