Efficient printable carbon-based mesoscopic perovskite solar cells based on aluminum and indium doped TiO2 compact layer

• Published in: Materials letters 2022-09, Vol.322, p.132427, Article 132427
• Main Authors: Wang, Dongjie, Kang, Jingrong, Zhang, Zheling, Zhu, Guisheng, Zhang, Xiaoling, Xiong, Jian, Zhang, Jian
• Format: Article
• Language: English
• Subjects: Perovskite; Semiconductors; Solar energy materials; Titanium dioxide
• ISSN: 0167-577X; 1873-4979
• DOI: 10.1016/j.matlet.2022.132427

[Display omitted] •Al and In co-doped TiO2 as compact layers for printable C-MPSCs.•AlIn-TiO2 exhibits optimized band alignment and improved charge transfer.•15.53% PCE was obtained in AlIn-TiO2-based devices with excellent air stability. Titanium dioxide (TiO2) is commonly used in high-performance carbon-based mesoscopic perovskite solar cells (C-MPSCs), but its relatively low charge mobility and severe carrier accumulation hinder further improvements in device performance. Here, we demonstrate the use of aluminum and indium co-doped TiO2 (AlIn-TiO2) as compact layers for highly efficient C-MPSCs. AlIn co-doping not only optimizes the band alignment at the AlIn-TiO2/perovskite interface, but also facilitates the charge transfer of pristine TiO2. As a result, the performance of AlIn-TiO2-based C-MPSCs is overall improved with an efficiency of 15.53%, which is more than 15% higher than that of pristine TiO2-based device (13.49%). This work enriches the metal doping mechanism of TiO2 and provides a simple and feasible method for obtaining efficient printable C-MPSCs.