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

Peng Huang^†,Ligang Yuan^†,Kaicheng Zhang^†,Qiaoyun Chen^†,Yi Zhou^*†（周祎）,Bo Song^*†（宋波）, andYongfang Li^†‡

^†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.

链接：https://pubs.acs.org/doi/10.1021/acsami.8b03225