Enhanced efficiency of polymer solar cells by improving molecular aggregation and broadening the absorption spectra

被引：39
作者：
Chen, Weichao [1 ,4 ]
Shen, Wenfei [1 ]
Wang, Huan [1 ]
Liu, Fushuai [2 ]
Duan, Linrui [2 ]
Xu, Xiaofeng [3 ]
Zhu, Dangqiang [2 ]
Qiu, Meng [2 ]
Wang, Ergang [3 ]
Yang, Renqiang [2 ]
机构：
[1] Qingdao Univ, Coll Text & Clothing, State Key Lab Biofibers & Ecotext, Collaborat Innovat Ctr Ecotext Shandong Prov, Qingdao 266071, Shandong, Peoples R China
[2] Chinese Acad Sci, Qingdao Inst Bioenergy & Bioproc Technol, Qingdao 266101, Shandong, Peoples R China
[3] Chalmers Univ Technol, Dept Chem & Biol Engn Polymer Technol, SE-41296 Gothenburg, Sweden
[4] Donghua Univ, Minist Educ, Key Lab Sci & Technol Ecotext, Shanghai 200051, Peoples R China
来源：
DYES AND PIGMENTS | 2019年 / 166卷
基金：
国家重点研发计划; 中国国家自然科学基金;
关键词：
Polymer solar cells; Alkylthio-substituents; Molecular aggregation; Absorption spectra; High fill factor; CONJUGATED POLYMERS; SIDE-CHAINS; CONVERSION EFFICIENCY; 2D-CONJUGATED POLYMER; PERFORMANCE; ALKYLTHIO; COPOLYMERS; DESIGN;
D O I：
10.1016/j.dyepig.2019.03.014
中图分类号：
O69 [应用化学];
学科分类号：
081704 ;
摘要：
Alkylthio-substituted thiophene-based benzo[1,2-b:4,5-b']dithiophene (BDT) was used to construct PBDTS-DTBT, a medium band gap donor-acceptor (D-A) polymer with 5,6-difluoro-4,7-bis[4-(2-octyldodecyl)thiophene-2-yl]benzo[c] [1,2,5]thiadiazole (DTBT). The incorporation of sulfur atoms into the side chains not only lowered the highest occupied molecular orbital (HOMO) energy level but also improved molecular aggregation and thus afforded lower band gap (1.68 eV) with full width at half maximum (FWHM) of 170 nm in comparison to that of the analogous polymer (PBDT-DTBT) without sulfur atoms in side chains. Therefore, the bulk heterojunction polymer solar cells based on PBDTS-DTBT with 2% diiodooctane (DIO) as processing additive showed a high power conversion efficiency (PCE) of 9.73% with high open-circuit voltage (V-OC, 0.93 V), large short-circuit current density (J(SC), 14.23 mA/cm(2)) and high fill factor (FF, 0.735).
引用
收藏
页码：42 / 48
页数：7
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