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Homochiral Asymmetric‐Shaped Electron‐Transporting Materials for Efficient Non‐Fullerene Perovskite Solar Cells
Author(s) -
Jung SuKyo,
Heo Jin Hyuck,
Lee Dae Woon,
Lee SeungHeon,
Lee SeungChul,
Yoon Woojin,
Yun Hoseop,
Kim Dongwook,
Kim Jong H.,
Im Sang Hyuk,
Kwon OPil
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.201802234
Subject(s) - fullerene , solubility , materials science , energy conversion efficiency , perovskite (structure) , chemical engineering , naphthalene , electron , crystallography , organic chemistry , chemistry , optoelectronics , physics , quantum mechanics , engineering
A design strategy is proposed for electron‐transporting materials (ETMs) with homochiral asymmetric‐shaped groups for highly efficient non‐fullerene perovskite solar cells (PSCs). The electron transporting N , N ′‐bis[( R )‐1‐phenylethyl]naphthalene‐1,4,5,8‐tetracarboxylic diimide (NDI‐PhE) consists of two asymmetric‐shaped chiral ( R )‐1‐phenylethyl (PhE) groups that act as solubilizing groups by reducing molecular symmetry and increasing the free volume. NDI‐PhE exhibits excellent film‐forming ability with high solubility in various organic solvents [about two times higher solubility than the widely used fullerene‐based phenyl‐C 61 ‐butyric acid methyl ester (PCBM) in o ‐dichlorobenzene]. NDI‐PhE ETM‐based inverted PSCs exhibit very high power conversion efficiencies (PCE) of up to 20.5 % with an average PCE of 18.74±0.95 %, which are higher than those of PCBM ETM‐based PSCs. The high PCE of NDI‐PhE ETM‐based PSCs may be attributed to good film‐forming abilities and to three‐dimensional isotropic electron transporting capabilities. Therefore, introducing homochiral asymmetric‐shaped groups onto charge‐transporting materials is a good strategy for achieving high device performance.