Facilitating Electron Transportation in Perovskite Solar Cells via Water-Soluble Fullerenol Interlayers

Tiantian Cao,Zhaowei Wang,Yijun Xia,Bo Song^*（宋波）,Yi Zhou^*（周祎）,Ning Chen^*（谌宁）, andYongfang Li

Laboratory of Advanced Optoelectronic Materials, College of Chemistry, Chemical Engineering and Materials Science,Soochow University, Suzhou 215123,PR China

ACS Appl. Mater. Interfaces,2016,8(28), pp 18284–18291

TiO₂is widely used in perovskite solar cells (Pero-SCs), but its low electrical conductivity remains a drawback for application in electron transport layer (ETL). To overcome this problem, an easily accessible hydroxylated fullerene, fullerenol, was employed herein as ETL modified on ITO inn-i-ptype (ITO as cathode) Pero-SCs for the first time. The results showed that the insertion of a single layer of fullerenol between perovskite and TiO₂dramatically facilitates the charge transportation and decreases the interfacial resistance. As a consequence, the device performance was greatly improved, and a higher power conversion efficiency of 14.69% was achieved, which is∼17.5% enhancement compared with that (12.50%) of the control device without the fullerenol interlayer. This work provides a new candidate of interfacial engineering for facilitating the electron transportation in Pero-SCs.

链接：http://pubs.acs.org/doi/abs/10.1021/acsami.6b04895