Conjugated polyelectrolyte hole transport layer for inverted-type perovskite solar cells

Hyosung Choi, Cheng-Kang Mai, Hak-Beom Kim, Jaeki Jeong, Seyeong Song, Guillermo C. Bazan (), Jin Young Kim () and Alan J. Heeger ()
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Hyosung Choi: College of Natural Sciences, Hanyang University
Cheng-Kang Mai: Center for Polymers and Organic Solids, University of California Santa Barbara
Hak-Beom Kim: School of Energy and Chemical Engineering, Ulsan National Institute of Science and Technology (UNIST)
Jaeki Jeong: School of Energy and Chemical Engineering, Ulsan National Institute of Science and Technology (UNIST)
Seyeong Song: School of Energy and Chemical Engineering, Ulsan National Institute of Science and Technology (UNIST)
Guillermo C. Bazan: Center for Polymers and Organic Solids, University of California Santa Barbara
Jin Young Kim: School of Energy and Chemical Engineering, Ulsan National Institute of Science and Technology (UNIST)
Alan J. Heeger: Center for Polymers and Organic Solids, University of California Santa Barbara

Nature Communications, 2015, vol. 6, issue 1, 1-6

Abstract: Abstract Organic–inorganic hybrid perovskite materials offer the potential for realization of low-cost and flexible next-generation solar cells fabricated by low-temperature solution processing. Although efficiencies of perovskite solar cells have dramatically improved up to 19% within the past 5 years, there is still considerable room for further improvement in device efficiency and stability through development of novel materials and device architectures. Here we demonstrate that inverted-type perovskite solar cells with pH-neutral and low-temperature solution-processable conjugated polyelectrolyte as the hole transport layer (instead of acidic PEDOT:PSS) exhibit a device efficiency of over 12% and improved device stability in air. As an alternative to PEDOT:PSS, this work is the first report on the use of an organic hole transport material that enables the formation of uniform perovskite films with complete surface coverage and the demonstration of efficient, stable perovskite/fullerene planar heterojunction solar cells.

Date: 2015
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DOI: 10.1038/ncomms8348

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