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Chlorinated Carbon‐Bridged and Silicon‐Bridged Carbazole‐Based Nonfullerene Acceptors Manifest Synergistic Enhancement in Ternary Organic Solar Cell with Efficiency over 15%
Author(s) -
Chen Tsung-Wei,
Yu Jun-Yan,
Lin You-Wei,
Peng Shih-Hao,
Wu Shang-Hsuan,
Su Yi-Jia,
Karapala Vamsi Krishna,
Hong Ling,
Yao Huifeng,
Hou Jianhui,
Hsu Chain-Shu
Publication year - 2020
Publication title -
solar rrl
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.544
H-Index - 37
ISSN - 2367-198X
DOI - 10.1002/solr.202000357
Subject(s) - ternary operation , homo/lumo , materials science , energy conversion efficiency , organic solar cell , photochemistry , stereochemistry , chemistry , polymer , molecule , optoelectronics , organic chemistry , computer science , composite material , programming language
Herein, two novel nonfullerene acceptors (NFAs), DTCC‐4Cl and DTSiC‐4Cl, are synthesized by end‐capping dithienocyclopentacarbazole (DTCC) and dithieno‐silolocarbazole (DTSiC) cores with chlorinated IC (2Cl‐IC) units, respectively. With the better‐known advantage of having the extraordinary σ *– π * conjugation of silole unit embedded in the DTSiC core, DTSiC‐4Cl manifests upshifted lowest unoccupied molecular orbital (LUMO), blue‐shifted absorption, and increased π – π interaction in comparison with DTCC‐4Cl. Furthermore, to elucidate the effect of bridging atoms on the photovoltaic performance, T1 is selected as the polymer donor to be blended with DTCC‐4Cl and DTSiC‐4Cl. T1:DTCC‐4Cl‐based devices exhibit a fine power conversion efficiency (PCE) of 14.43% and T1:DTSiC‐4Cl‐based devices exhibit a comparable PCE of 14.46%. Interestingly, the T1:DTSiC‐4Cl‐based devices demonstrate an additive‐free feature, which is worthy of further applications. From the perspective of constructing high‐performance ternary devices, DTCC‐4Cl is expected to possess excellent compatibility with DTSiC‐4Cl owing to its structural similarity. As anticipated, the ternary T1:DTSiC‐4Cl:DTCC‐4Cl‐based device outperforms the binary T1:DTCC‐4Cl and T1:DTSiC‐4Cl‐based devices, affording a decent PCE of 15.04% with a V OC of 0.97 V, a J SC of 20.80 mA cm −2 , and an FF of 74.55% without any additive.