title: A simple 3,4-ethylenedioxythiophene based hole-transporting material for perovskite solar cells.
abstract: We report a novel electron-rich molecule based on 3,4-ethylenedioxythiophene (H101). When used as the hole-transporting layer in a perovskite-based solar cell, the power-conversion efficiency reached 13.8 % under AM 1.5G solar simulation. This result is comparable with that obtained using the well-known hole transporting material 2,2',7,7'-tetrakis(N,N-di-p-methoxyphenylamine)-9,9'-spirobifluorene (spiro-OMeTAD). This is the first heterocycle-containing material achieving >10 % efficiency in such devices, and has great potential to replace the expensive spiro-OMeTAD given its much simpler and cheaper synthesis.
authors.affiliation: Energy Research Institute @ NTU (ERI@N), School of Materials Science and Engineering, Nanyang Technological University, Nanyang Avenue, Singapore 637553 (Singapore).
authors.forename: Hairong
authors.initials: H
authors.lastname: Li
authors.forename: Kunwu
authors.initials: K
authors.lastname: Fu
authors.forename: Anders
authors.initials: A
authors.lastname: Hagfeldt
authors.forename: Michael
authors.initials: M
authors.lastname: Grätzel
authors.forename: Subodh G
authors.initials: SG
authors.lastname: Mhaisalkar
authors.forename: Andrew C
authors.initials: AC
authors.lastname: Grimsdale
keywords: heterocycles; perovskite; solar cells