Graphene-oxide doped PEDOT: PSS as a superior hole transport material for high-efficiency perovskite solar cell

Inverted perovskite solar cells have attracted a great deal of attention due to its high power conversion efficiency, simple configuration, and low-cost processing. The hole transport material (HTM) is a crucial factor in high performance inverted perovskite solar cell. However, the hole mobility for most common of HTM is too low to matching perovskite materials. Herein, we report a superior HTM with high hole mobility to significantly improve solar cell efficiency. Upon doing the commonly used PEDOT: PSS HTM by graphene oxide (GO), its hole mobility is increased from 5.55x10(-5) to 1.57x10(-4) cm(2) V-1 s(-1), leading to efficient hole extraction and low current leakage, therefore 20% higher power conversion efficiency comparing to the control device without the GO doping. The development open the opportunities for efficient HTMs based on the two-dimensional materials in the perovskite solar cells. (C) 2017 Elsevier B.V. All rights reserved.