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Organic hole-transporting materials for 9.32%-efficiency and stable CsPbBr3 perovskite solar cells

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Abstract

Cost-effective and stable CsPbBr3-based inorganic perovskite solar cells (PSCs) are regarded as promising candidates for next-generation photovoltaics. However, the large interfacial energy differences at the CsPbBr3/hole-transporting layer lead to serious charge recombination and poor charge extraction kinetics. Herein, we prepare a series of hole-transporting materials (HTMs) to improve hole extraction and to reduce electron–hole recombination at the CsPbBr3/HTM interface. In comparison with the power conversion efficiency (PCE) of 6.10% for an HTM-free device, the CsPbBr3 PSCs with polymeric HTMs such as polythiophene, polypyrrole and polyaniline yield efficiencies of 8.36%, 8.32% and 7.69%, respectively. Similarly, the inorganic PSC with organic small molecule BT-BTH achieves a PCE as high as 9.32% due to the improved hole conductivity. Moreover, the unencapsulated PSC with BT-BTH maintains 94% of its initial efficiency in 70% relative humidity over 80 days.

Graphical abstract: Organic hole-transporting materials for 9.32%-efficiency and stable CsPbBr3 perovskite solar cells

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Publication details

The article was received on 09 Jul 2018, accepted on 07 Oct 2018 and first published on 08 Oct 2018


Article type: Research Article
DOI: 10.1039/C8QM00337H
Citation: Mater. Chem. Front., 2018, Advance Article
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    Organic hole-transporting materials for 9.32%-efficiency and stable CsPbBr3 perovskite solar cells

    Y. Zhao, T. Liu, F. Ren, J. Duan, Y. Wang, X. Yang, Q. Li and Q. Tang, Mater. Chem. Front., 2018, Advance Article , DOI: 10.1039/C8QM00337H

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