title: Novel Combination of Efficient Perovskite Solar Cells with Low Temperature Processed Compact TiO2 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-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 (J-V) curves in TiO2-based p-PSCs is also unveiled.
authors.affiliation: College of Electronic Information and Optical Engineering, Nankai University , Tianjin 300071, China.
authors.forename: Yangyang
authors.initials: Y
authors.lastname: Du
authors.affiliation: College of Electronic Information and Optical Engineering, Nankai University , Tianjin 300071, China.
authors.forename: Hongkun
authors.initials: H
authors.lastname: Cai
authors.affiliation: College of Electronic Information and Optical Engineering, Nankai University , Tianjin 300071, China.
authors.forename: Hongbin
authors.initials: H
authors.lastname: Wen
authors.affiliation: College of Electronic Information and Optical Engineering, Nankai University , Tianjin 300071, China.
authors.forename: Yuxiang
authors.initials: Y
authors.lastname: Wu
authors.affiliation: College of Electronic Information and Optical Engineering, Nankai University , Tianjin 300071, China.
authors.forename: Like
authors.initials: L
authors.lastname: Huang
authors.affiliation: College of Electronic Information and Optical Engineering, Nankai University , Tianjin 300071, China.
authors.forename: Jian
authors.initials: J
authors.lastname: Ni
authors.affiliation: College of Electronic Information and Optical Engineering, Nankai University , Tianjin 300071, China.
authors.forename: Juan
authors.initials: J
authors.lastname: Li
authors.affiliation: College of Electronic Information and Optical Engineering, Nankai University , Tianjin 300071, China.
authors.forename: Jianjun
authors.initials: J
authors.lastname: Zhang
keywords: AO-TiO2; anodic oxidation (AO); low temperature; morphology; planar perovskite solar cells (p-PSCs)