Issue 44, 2017

Dopant-free and low-cost molecular “bee” hole-transporting materials for efficient and stable perovskite solar cells

Abstract

With the dramatic development of the power conversion efficiency (PCE) of perovskite solar cells (PSCs), the device lifetime has attracted extensive research interest and concern. To enhance device durability, developing dopant-free hole-transporting materials (HTMs) with a high performance is a promising strategy. Herein, three new HTMs with a N,N′-diphenyl-N,N′-di(m-tolyl)benzidine (TPD) core: TPD-4MeTPA, TPD-4MeOTPA and TPD-4EtCz are designed and synthesized, showing suitable energy levels and excellent film-formation properties. PCEs of 15.28% were achieved based on pristine TPD-4MeOTPA as the HTM, which is a little lower than that of the p-doped 2,2′,7,7′-tetrakis-(N,N-di-4-methoxyphenylamino)-9,9′-spirobifluorene (spiro-OMeTAD)-based device (17.26%). Importantly, the devices based on the new HTMs show relatively improved stability compared to devices based on spiro-OMeTAD when aged under ambient air with 30% relative humidity in the dark.

Graphical abstract: Dopant-free and low-cost molecular “bee” hole-transporting materials for efficient and stable perovskite solar cells

Supplementary files

Article information

Article type
Paper
Submitted
29 août 2017
Accepted
11 oct. 2017
First published
12 oct. 2017

J. Mater. Chem. C, 2017,5, 11429-11435

Dopant-free and low-cost molecular “bee” hole-transporting materials for efficient and stable perovskite solar cells

X. Liu, F. Zhang, Z. Liu, Y. Xiao, S. Wang and X. Li, J. Mater. Chem. C, 2017, 5, 11429 DOI: 10.1039/C7TC03931J

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