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

130 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

Bibliographical note

KAUST Repository Item: Exported on 2020-10-01
Acknowledged KAUST grant number(s): KUS-C1-015-21
Acknowledgements: A.M., H.K., and P.B. thank the German Federal Ministry of Education and Research (BMBF) for financial support in the frame of joint project LOTsE. P.Q., M.K.N., S.M.Z., and M.G. acknowledge financial contribution from Greatcell Solar SA, Epalinges, Switzerland, the King Abdullah University of Science and Technology (KAUST, Award no. KUS-C1-015-21), the European Community's Seventh Framework Programme "CE-Mesolight" EPFL ECR advanced grant agreement no. 247404. M.K.N. thanks the Global Research Laboratory (GRL) Program, Korea, and World Class University programs (Photovoltaic Materials, Department of Material Chemistry, Korea University) funded by the Ministry of Education, Science and Technology through the National Research Foundation of Korea (no. R31-2008-000-10035-0). The authors thank Dr Peng Gao for the synthesis of CH3NH3I and Dr Nicolas Tetreault for the Cross-sectional SEM measurement.
This publication acknowledges KAUST support, but has no KAUST affiliated authors.

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