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Yang, Changduk
Advanced Tech-Optoelectronic Materials Synthesis Lab.
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Wide Band-gap Two-dimension Conjugated Polymer Donors with Different Amounts of Chlorine Substitution on Alkoxyphenyl Conjugated Side Chains for Non-fullerene Polymer Solar Cells

Author(s)
Zhang, YoudiWang, YongMa, RuijieLuo, ZhenghuiLiu, TaoKang, So-HueiYan, HeYuan, ZhongyiYang, ChangdukChen, Yiwang
Issued Date
2020-08
DOI
10.1007/s10118-020-2435-5
URI
https://scholarworks.unist.ac.kr/handle/201301/32360
Fulltext
https://link.springer.com/article/10.1007%2Fs10118-020-2435-5
Citation
CHINESE JOURNAL OF POLYMER SCIENCE, v.38, no.8, pp.797 - 805
Abstract
In this study, wide bandgap (WBG) two-dimensional (2D) copolymer donors (DZ1, DZ2, and DZ3) based on benzodithiophene (BDT) on alkoxyphenyl conjugated side chains without and with different amounts of chlorine atoms and difluorobenzotriazole (FBTZ) are designed and synthesized successfully for efficient non-fullerene polymer solar cells (PSCs). Three polymer donors DZ1, DZ2, and DZ3 display similar absorption spectra at 300-700 nm range with optional band-gap (E-g(opt)) of 1.84, 1.92, and 1.97 eV, respectively. Compared with reported DZ1 without chlorine substitution, it is found that introducing chlorine atoms into the meta-position of the alkoxyphenyl group affords polymer possessing a deeper the highest occupied molecular orbital (HOMO) energy level, which can increase open circuit voltage (V-OC) of PSCs, as well as improve hole mobility. Non-fullerene bulk heterojunction PSCs based on DZ2:MeIC demonstrate a relatively high power conversion efficiency (PCE) of 10.22% with a V-OC of 0.88 V, a short-circuit current density (J(SC)) of 17.62 mA/cm(2), and a fill factor (FF) of 68%, compared with PSCs based on DZ1:MeIC (a PCE of 8.26%) and DZ3:MeIC (a PCE of 6.28%). The results imply that adjusting chlorine atom amount on alkoxyphenyl side chains based on BDT polymer donors is a promising approach of synthesizing electron-rich building block for high performance of PSCs.
Publisher
SPRINGER
ISSN
0256-7679
Keyword (Author)
Wide-bandgap copolymerOrganic solar cellsPolymer donorsChlorine substitutionNonfullerene polymer solar cells
Keyword
BENZOTRIAZOLE-BASED ACCEPTORSMALL-MOLECULE ACCEPTORSEFFICIENTPERFORMANCECOPOLYMERSSTRATEGYENABLESDESIGN

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