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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.

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


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 %.


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


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