High-performance hybrid perovskite solar cells with polythiophene as hole-transporting layer electrochemical polymerization

• Published in: RSC advances 2014-07, Vol.4 (62), p.3339-3346
• Main Authors: Yan, Weibo, Li, Yunlong, Sun, Weihai, Peng, Haitao, Ye, Senyun, Liu, Zhiwei, Bian, Zuqiang, Huang, Chunhui
• Format: Article
• ISSN: 2046-2069
• DOI: 10.1039/c4ra05578k

Thin polythiophene film prepared via electrochemical polymerization has been successfully used as the hole-transporting layer in CH 3 NH 3 PbI 3 perovskite solar cells, affording a series of ITO/polythiophene/CH 3 NH 3 PbI 3 /C 60 /BCP/Ag devices. The highest occupied molecular orbit (HOMO) and lowest unoccupied molecular orbit (LUMO) of the polythiophene film are determined as −5.20 eV and −3.12 eV, respectively, which match well with that of CH 3 NH 3 PbI 3 perovskite material. In addition, a promising power conversion efficiency of 11.8%, featuring a high fill factor of 0.707, good open voltage of 1.03 V and short current density of 16.2 mA cm −2 , has been obtained, which renders polythiophene as an effective competitor to spiro-OMeTAD in perovskite solar cells. Furthermore, this work provides a simple, prompt, controllable and economic approach for the preparation of hole-transporting layer, which would undoubtedly yield new insight into the industrial production of perovskite solar cells. Thin polythiophene film prepared via electrochemical polymerization has been successfully used as the hole-transporting layer in CH 3 NH 3 PbI 3 perovskite solar cells, affording a series of ITO/polythiophene/CH 3 NH 3 PbI 3 /C 60 /BCP/Ag devices.