Premium
Core Structure Engineering in Hole‐Transport Materials to Achieve Highly Efficient Perovskite Solar Cells
Author(s) -
Ji Yu,
He Bizu,
Lu Huiqiang,
Xu Jing,
Wang Rui,
Jin Yanzi,
Zhong Cheng,
Shan Yahan,
Wu Fei,
Zhu Linna
Publication year - 2019
Publication title -
chemsuschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.412
H-Index - 157
eISSN - 1864-564X
pISSN - 1864-5631
DOI - 10.1002/cssc.201803025
Subject(s) - perovskite (structure) , materials science , photoluminescence , dipole , energy conversion efficiency , electron mobility , planar , space charge , nanotechnology , crystallography , optoelectronics , chemistry , electron , organic chemistry , physics , computer graphics (images) , quantum mechanics , computer science
In this work, the thiadiazolopyridine (PT) unit was introduced as the core structure, with N 3 , N 3 , N 6 , N 6 ‐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 %.