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ChemSusChem. 2019 Apr 5;12(7):1374-1380. doi: 10.1002/cssc.201803025. Epub 2019 Feb 27.

Core Structure Engineering in Hole-Transport Materials to Achieve Highly Efficient Perovskite Solar Cells.

Author information

1
Chongqing Key Laboratory for Advanced Materials and Technologies of Clean Energy, School of Materials & Energy, Southwest University, Chongqing, 400715, P.R. China.
2
School of Chemistry and Chemical Engineering, Ankang University, Ankang, 725000, P.R. China.
3
Department of Chemistry, Wuhan University, Wuhan, 430072, P.R. China.

Abstract

In this work, the thiadiazolopyridine (PT) unit was introduced as the core structure, with N3 ,N3 ,N6 ,N6 -tetrakis(4-methoxyphenyl)-9-phenyl-9 H-carbazole-3,6-diamine as the peripheral group, to obtain a new compound, JY8, for use as a hole-transport material (HTM) in planar perovskite solar cells (PSCs). Compared with the previously reported JY5 with benzothiadiazole as the core structure, the PT unit with stronger electron-withdrawing ability enhanced the intermolecular dipole-dipole interaction. Moreover, the introduction of the PT unit made the central part in JY8 more planar than its analogue JY5, which is conducive to charge transport. Field-emission (FE)-SEM images suggested a smooth and condense morphology of the JY8 film, which could improve the contact between the perovskite layer and the metal electrode. Space-charge limitation of current results, steady-state, and time-resolved photoluminescence decay curves indicated that JY8 as HTM facilitated hole extraction and hole transport. Consequently, planar PSCs fabricated with JY8 as the HTM exhibited a decent efficiency of 19.14 % with a high fill factor of 81 %.

KEYWORDS:

fill factor; hole-transport materials; perovskite solar cells; power conversion efficiency; thiadiazolopyridine

PMID:
30666810
DOI:
10.1002/cssc.201803025

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