Enhanced Lifetime and Photostability with Low‐Temperature Mesoporous ZnTiO3/Compact SnO2 Electrodes in Perovskite Solar Cells. Issue 51 (4th November 2019)

• Record Type: Journal Article
• Authors: Guo, Fengwan; Sun, Xiangyu; Liu, Bing; Yang, Zijiang; Wei, Jing; Xu, Dongsheng
• Is Part Of: Angewandte Chemie international edition. Volume 58:Issue 51(2019)
• Page Start: 18460
• Page End: 18465
• Publication Date: 2019-11-04
• Subjects: electron-transporting layers -- mesoporous structures -- perovskite solar cells -- photostability -- ZTO; Chemistry -- Periodicals; 540
• DOI: 10.1002/anie.201911796
• Languages: English
• ISSNs: 1433-7851

Abstract

Abstract: Perovskite solar cells (PSCs) with power conversion efficiencies (PCEs) of 25 % mainly have SnO2 or TiO2 as electron‐transporting layers (ETLs). Now, zinc titanate (ZnTiO3, ZTO) is proposed as mesoporous ETLs owing to its weak photo‐effect, excellent carrier extraction, and transfer properties. Uniform mesoporous films were obtained by spinning coating the ZTO ink and annealed below 150 °C. Photovoltaic devices based on Cs0.05 FA0.81 MA0.14 PbI2.55 Br0.45 perovskite sandwiched between SnO2 ‐mesorporous ZTO electrode and Spiro‐OMeTAD layer achieved the PCE of 20.5 %. The PSCs retained more than 95 % of their original efficiency after 100 days lifetime test without being encapsulated. Additionally, the PSCs retained over 95 % of the initial performance when subjected at the maximum power point voltage for 120 h under AM 1.5 G illumination (100 mW cm −2 ), demonstrating superior working stability. The application of ZTO provides a better choice for ETLs of PSCs. Abstract : Low‐temperature‐processed, UV‐inert ZnTiO3 as a mesoporous layer was introduced in SnO2 ‐based planar perovskite solar cells. The application of ZnTiO3 modified the interface of SnO2 /perovskite, and significantly improve the UV stability and lifetime of devices. The low‐temperature mesoporous structure expands the choice for transmission layer and electrode materials.