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Molecularly engineered hole-transport material for low-cost perovskite solar cells† † Electronic supplementary information (ESI) available. See DOI: 10.1039/c9sc05694g

ABSTRACT: Triphenylamine-N-phenyl-4-(phenyldiazenyl)aniline (TPA-AZO) is synthesized via a facile CuI-catalyzed reaction and used as a hole transport material (HTM) in perovskite solar cells (PSCs), as an 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 molecular orbital (HOMO) level of TPA-AZO is deeper than that of spiro-OMeTAD, and optimally matches with the conduction band of the perovskite light absorber. The use of TPA-AZO as a HTM results in PSC prototypes with a power conversion efficiency (PCE) approaching that of the spiro-OMeTAD-based reference device (17.86% vs. 19.07%). Moreover, the use of inexpensive starting reagents for the synthesis of 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 that of spiro-OMeTAD ($170–475). Overall, TPA-AZO-based HTMs are promising candidates for the implementation of viable PSCs in large-scale production. Organic hole transport materials (HTMs) strongly affect the cost of efficient perovskite solar cells. In this work, a newly engineered HTM based on triphenylamine is proposed as a cheap alternative to efficient organic HTMs (e.g., spiro-OMeTAD).

SUBMITTER: Pashaei B

PROVIDER: S-EPMC8157471 | biostudies-literature |

REPOSITORIES: biostudies-literature

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