Highly efficient inverted perovskite solar cells incorporating P3CT-Rb as hole transport layer to achieve large open circuit voltage of 1.144 V
P3CT has been noticed as a promising hole transport layer (HTL) for high-performance inverted planar perovskite solar cells (PSCs) due to its excellent stability and relatively high hole mobility. As we all know, the morphology of perovskite film is largely influenced by the substrate materials. Considering the affinity of alkali metal ions Rb+, Cs+ with perovskite materials, inverted perovskite solar cells using alkali metal ions (Rb+, Cs+) doped P3CT (denoted as P3CT-Rb, P3CT-Cs) as the HTLs were investigated in this work. It turned out that work function of P3CT-Rb matches well with the valence band of perovskite. Perovskite (MAPbI3-xClx) film deposited on top of the P3CT-Rb film exhibited a dense and uniform morphology with superior crystallinity and few pinholes. Consequently, a high efficiency of 20.52% was achieved on P3CT-Rb HTL-based devices, with an impressive open-circuit voltage (Voc) of 1.144 V and a high fill factor (FF) of 82.78%.
- This article is part of the themed collection: 2020 Nanoscale HOT Article Collection