Novel Combination of Efficient Perovskite Solar Cells with Low Temperature Processed Compact TiO2 Layer via Anodic Oxidation

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• 作者：Yangyang Du ; Hongkun Cai ; Hongbin Wen ; Yuxiang Wu ; Like Huang ; Jian Ni ; Juan Li ; Jianjun Zhang
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2016
• 出版时间：May 25, 2016
• 年：2016
• 卷：8
• 期：20
• 页码：12836-12842
• 全文大小：479K
• 年卷期：0
• ISSN：1944-8252

文摘

In this work, a facile and low temperature processed anodic oxidation approach is proposed for fabricating compact and homogeneous titanium dioxide film (AO-TiO<sub>2sub>). In order to realize morphology and thickness control of AO-TiO<sub>2sub>, the theory concerning anodic oxidation (AO) is unveiled and the influence of relevant parameters during the process of AO such as electrolyte ingredient and oxidation voltage on AO-TiO<sub>2sub> formation is observed as well. Meanwhile, we demonstrate that the planar perovskite solar cells (p-PSCs) fabricated in ambient air and utilizing optimized AO-TiO<sub>2sub> as electron transport layer (ETL) can deliver repeatable power conversion efficiency (PCE) over 13%, which possess superior open-circuit voltage (Voc) and higher fill factor (FF) compared to its counterpart utilizing conventional high temperature processed compact TiO<sub>2sub> (c-TiO<sub>2sub>) as ETL. Through a further comparative study, it is indicated that the improvement of device performance should be attributed to more effective electron collection from perovskite layer to AO-TiO<sub>2sub> and the decrease of device series resistance. Furthermore, hysteresis effect about current density–voltage (J–V) curves in TiO<sub>2sub>-based p-PSCs is also unveiled.