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IOP Publishing, IOP Conference Series: Materials Science and Engineering, 1(556), p. 012022, 2019

DOI: 10.1088/1757-899x/556/1/012022

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Synthesis of a carbazole-substituted diphenylethylene hole transporting material and application in perovskite solar cells

Journal article published in 2019 by Juncong Li, Hongwei Zhu ORCID, Xianggao Li, Shirong Wang, Yin Xiao
This paper is made freely available by the publisher.
This paper is made freely available by the publisher.

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Abstract

Abstract In this work, a carbazole-substituted stilbene derivatives hole transporting material, 9,9’-(ethene-1,1-diylbis(4,1-phenylene))bis(3,6-dimethoxy-9H-carbazole) (EPC) was designed and synthesized. The structure was characterized by FT-IR spectroscopy, 1H NMR, 13C NMR and MS. The glass transition temperature is 95.09°C and the 5% weight loss temperature is 423.37°C by DSC/TG analysis. Through the UV-Vis absorption spectrum combined with cyclic voltammetry, the energy level of the highest occupied molecular orbital (HOMO) of EPC and the lowest unoccupied orbital (LUMO) energy level were obtained (-5.38 eV, -2.19 eV). The energy level is well matched with methylamine lead iodine crystals. A mesoporous structure perovskite solar cell was fabricated based on the undoped EPC, and photoelectric conversion efficiency of 13.11% was obtained. After 600 hours of storage in a dark environment at 25°C and 60% relative humidity, 82% of the initial efficiency was obtained. This work provides new ideas for the development of undoped hole transporting materials.