Impact of sol aging on TiO₂ compact layer and photovoltaic performance of perovskite solar cell

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• 作者：Lixue Guo 郭立雪 ; Chengbin Fei 费成斌 ; Rong Zhang 张荣 ; Bo Li 李波…
• 关键词：perovskite solar cells ; TiO2 sol ; compact layer ; aging time
• 刊名：Science China Materials
• 出版年：2016
• 出版时间：September 2016
• 年：2016
• 卷：59
• 期：9
• 页码：710-718
• 全文大小：3,510 KB
• 刊物类别：Materials Science, general; Chemistry/Food Science, general;
• 刊物主题：Materials Science, general; Chemistry/Food Science, general;
• 出版者：Science China Press
• ISSN：2199-4501
• 卷排序：59

文摘

Perovskite solar cells are known to have a power conversion efficiency dependent on subtle variation in chemical composition and crystal and microstructures of materials, processing conditions, and device fabrication procedures and conditions. The present work demonstrates such strong dependence of power conversion efficiency on a TiO₂ film made of the same sol with various aging time. A dense and conformal TiO₂ film was prepared by sol-gel method, and the influences of its surface morphology and thickness on performance of perovskite solar cells have been investigated. The surface morphology and thickness of the TiO₂ film were tuned by adjusting the aging time of sol, resulting in enhanced short-circuit current density and fill factor of the perovskite solar cells due to increased coverage and roughness of perovskite films, light refraction, and effective charge recombination blocking effect, which were verified by means of the light absorption spectra, photoluminescence of perovskite films with and without hole transport layer, cyclic voltammogram, and electrochemical impedance spectra. The cells with a dense and conformal TiO₂ compact layer derived fromthe sol aged for 4 h exhibit a power conversion efficiency of 15.7%, 50% higher than the efficiency based on TiO₂ layer derived from 0 h aging sol and 3 times of the efficiency with TiO₂ layer made from 8 h aged sol.