Issue 12, 2018

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

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

Supplementary files

Article information

Article type
Research Article
Submitted
09 Qad 2018
Accepted
07 Dit 2018
First published
08 Dit 2018

Mater. Chem. Front., 2018,2, 2239-2244

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, 2, 2239 DOI: 10.1039/C8QM00337H

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