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Novel Combination of Efficient Perovskite Solar Cells with Low Temperature Processed Compact TiO<sub>2</sub> Layer via Anodic Oxidation

Abstract

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>2</sub>). In order to realize morphology and thickness control of AO-TiO<sub>2</sub>, 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>2</sub> 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>2</sub> 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>2</sub> (c-TiO<sub>2</sub>) 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>2</sub> and the decrease of device series resistance. Furthermore, hysteresis effect about current density–voltage (<i>J</i>–<i>V</i>) curves in TiO<sub>2</sub>-based p-PSCs is also unveiled

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The Francis Crick Institute

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Last time updated on 12/02/2018

This paper was published in The Francis Crick Institute.

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