Low band gap S,N-heteroacene-based oligothiophenes as hole-transporting and light absorbing materials for efficient perovskite-based solar cells

Peng Qin, Hannelore Kast, Mohammad K. Nazeeruddin, Shaik M. Zakeeruddin, Amaresh Mishra, Peter Bäuerle, Michael Grätzel

Research output: Contribution to journalArticlepeer-review

117 Scopus citations

Abstract

Novel low band gap oligothiophenes incorporating S,N-heteropentacene central units were developed and used as hole-transport materials (HTMs) in solid-state perovskite-based solar cells. In addition to appropriate electronic energy levels, these materials show high photo-absorptivity in the low energy region, and thus can contribute to the light harvesting of the solar spectrum. Solution-processed CH3NH3PbI3-based devices using these HTMs achieved power conversion efficiencies of 9.5-10.5% in comparison with 7.6% obtained by reference devices without HTMs. Photoinduced absorption spectroscopy gave further insight into the charge transfer behavior between photoexcited perovskites and the HTMs. This journal is © the Partner Organisations 2014.
Original languageEnglish (US)
Pages (from-to)2981
JournalEnergy & Environmental Science
Volume7
Issue number9
DOIs
StatePublished - Jul 15 2014
Externally publishedYes

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