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Molecularly Engineered Hole-Transport Material for Low-cost Perovskite Solar Cells

Abstract

Triphenylamine-N-phenyl-4-(phenyldiazenyl)aniline (TPA-AZO) is synthetized via a facile CuI-catalyzed reaction and used as hole transport material (HTM) in perovskite solar cells (PSCs), as alternative to the expensive spiro-type molecular materials, including commercial 2,2′,7,7′-Tetrakis[N,N-di(4-methoxyphenyl)amino]-9,9′-spirobifluorene (spiro-OMeTAD). Experimental and computational investigations reveal that the highest occupied molecule orbital (HOMO) level of the TPA-AZO is deeper than the one of the spiro-OMeTAD, and optimally matches with the conduction band of the perovskite light absorber. The use of TPA-AZO as HTM results in PSC prototypes with a power conversion efficiency (PCE) approaching the one of the spiro-OMeTAD-based reference device (17.86% vs. 19.07%). Moreover, the use of inexpensive starting reagents for the synthesis of the TPA-AZO makes the latter a new affordable HTM for PSCs. In particular, the cost of 1 g of TPA-AZO ($22.76) is significantly lower compared to the one of spiro-OMeTAD ($170-475). Overall, the TPA-AZO-based HTMs are promising candidates for the implementation of viable PSCs in large-scale production.

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Supplementary files

Article information


Submitted
09 Nov 2019
Accepted
12 Jan 2020
First published
13 Jan 2020

This article is Open Access
All publication charges for this article have been paid for by the Royal Society of Chemistry

Chem. Sci., 2020, Accepted Manuscript
Article type
Edge Article

Molecularly Engineered Hole-Transport Material for Low-cost Perovskite Solar Cells

B. Pashaei, H. Shahroosvand, S. Bellani and F. Bonaccorso, Chem. Sci., 2020, Accepted Manuscript , DOI: 10.1039/C9SC05694G

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