期刊
CHINESE JOURNAL OF POLYMER SCIENCE
卷 38, 期 8, 页码 797-805出版社
SPRINGER
DOI: 10.1007/s10118-020-2435-5
关键词
Wide-bandgap copolymer; Organic solar cells; Polymer donors; Chlorine substitution; Nonfullerene polymer solar cells
资金
- National Natural Science Foundation of China [51763017, 21602150, 51425304, 51863012, 21861025, 51833004]
- Shen Zhen Technology and Innovation Commission [JCYJ20170413173814007, JCYJ20170818113905024]
- Hong Kong Research Grants Council [R6021-18, 16305915, 16322416, 606012, 16303917]
- Hong Kong Innovation and Technology Commission [ITC-CNERC14SC01, ITS/471/18]
- National Research Foundation of Korea (NRF) - Korea government (MSIP) [2018R1A2A1A05077194]
- Wearable Platform Materials Technology Center (WMC) - National Research Foundation of Korea (NRF) Grant by the Korean Government (MSIT) [2016R1A5A1009926]
- Ulsan City of UNIST (Ulsan National Institute of Science Technology) [1.200042]
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.
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