Room-Temperature and Aqueous Solution-Processed Two-Dimensional TiS2as an Electron Transport Layer for Highly Efficient and Stable Planar n–i–p Perovskite Solar Cells
†Laboratory of Advanced Optoelectronic Materials, College of Chemistry Chemical Engineering and Materials Science,Soochow University,Suzhou215123,China
‡CAS Research/Education Center for Excellence in Molecular Sciences, CAS Key Laboratory of Organic Solids, Institute of Chemistry,Chinese Academy of Sciences,Beijing100190,China
ACS Appl. Mater. Interfaces,2018,10(17), 14796--14802
In this study, a room-temperature and aqueous solution-processed two-dimensional (2D) transition-metal dichalcogenide TiS2was applied as an electron transport layer (ETL) in planar n–i–p perovskite solar cells (Pero-SCs). Upon insertion of the 2D TiS2ETL with UV-ozone (UVO) treatment, the power conversion efficiency (PCE) of the planar Pero-SCs was optimized to 18.79%. To the best of our knowledge, this value should be the highest efficiency to date among those PCEs of the n–i–p Pero-SCs with room-temperature-processed metal compound ETLs. More importantly, the n–i–p Pero-SCs with the UVO-treated 2D TiS2as an ETL also show extremely high stability, where the average PCE remained over 95% of its initial value after 816 h storage without encapsulation.