SnO2: A Wonderful Electron Transport Layer for Perovskite Solar Cells

• Published in: Small (Weinheim an der Bergstrasse, Germany) Vol. 14; no. 31; pp. e1801154 - n/a
• Main Authors: Jiang, Qi, Zhang, Xingwang, You, Jingbi
• Format: Journal Article
• Language: English
• Published: Weinheim Wiley Subscription Services, Inc 02-08-2018
• Subjects: Charge transport; Electron mobility; Electron transport; electron transport layer; Energy conversion efficiency; Nanotechnology; perovskite solar cells; Perovskites; Photovoltaic cells; SnO2; Solar cells; Tin dioxide; Titanium dioxide
• ISSN: 1613-6810; 1613-6829
• DOI: 10.1002/smll.201801154

The highest power conversion efficiency of perovskite solar cells is beyond 22%. Charge transport layers are found to be critical for device performance and stability. A traditional electron transport layer (ETL), such as TiO2, is not very efficient for charge extraction at the interface, especially in planar structure. In addition, the devices using TiO2 suffer from serious degradation under ultraviolet illumination. SnO2 owns a better band alignment with the perovskite absorption layer and high electron mobility, which is helpful for electron extraction. In this Review, recent progresses in efficient and stable perovskite solar cells using SnO2 as ETL are summarized.
SnO2 is a suitable electron transport layer (ETL) in perovskite solar cells considering its high mobility, deep conduction band and good chemical stability. Perovskite solar cells based on SnO2 show power conversion efficiency of 21.6%, and over 1000 h of photo‐soaking stability is reported. Here, recent progress in efficient and stable perovskite solar cells using SnO2 as ETL are summarized.