Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 8, Issue 20, Pages 12836-12842Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.6b02706
Keywords
planar perovskite solar cells (p-PSCs); anodic oxidation (AO); AO-TiO2; low temperature; morphology
Funding
- National Natural Science Foundation of China [61504068]
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In this work, a facile and low temperature processed anodic oxidation approach is proposed for fabricating compact and homogeneous titanium dioxide film (AO-TiO2). In order to realize morphology and thickness control of AO-TiO2, 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-TiO2 formation is observed as well. Meanwhile, we demonstrate that the planar perovskite solar cells (p-PSCs) fabricated in ambient air and utilizing optimized AO-TiO2 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 TiO2 (c-TiO2) 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-TiO2 and the decrease of device series resistance. Furthermore, hysteresis effect about current density voltage (I-17) curves in TiO2-based p-PSCs is also unveiled.
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