Novel Donor-Acceptor Polymer Containing 4,7-Bis(thiophen-2-yl)benzo[c][1,2,5]thiadiazole for Polymer Solar Cells with Power Conversion Efficiency of 6.21%

被引：34
作者：
Han, Liangliang [1 ]
Bao, Xichang [1 ]
Hu, Tong [2 ]
Du, Zhengkun [1 ]
Chen, Weichao [1 ]
Zhu, Dangqiang [1 ]
Liu, Qian [2 ]
Sun, Mingliang [2 ]
Yang, Renqiang [1 ]
机构：
[1] Chinese Acad Sci, Qingdao Inst Bioenergy & Bioproc Technol, CAS Key Lab Biobased Mat, Qingdao 266101, Peoples R China
[2] Ocean Univ China, Inst Mat Sci & Engn, Qingdao 266100, Peoples R China
来源：
MACROMOLECULAR RAPID COMMUNICATIONS | 2014年 / 35卷 / 12期
基金：
中国国家自然科学基金;
关键词：
electrochemistry; high solubility; photophysics; polymer solar cells; tris(octyloxy)benzene; OPEN-CIRCUIT VOLTAGE; HIGH-PERFORMANCE; SEMICONDUCTING POLYMERS; FLUORINATED BENZOTHIADIAZOLE; PHOTOVOLTAIC PERFORMANCE; ELECTRONIC-PROPERTIES; CONJUGATED POLYMERS; BUILDING-BLOCK; SIDE-CHAINS; BENZODITHIOPHENE;
D O I：
10.1002/marc.201400036
中图分类号：
O63 [高分子化学（高聚物）];
学科分类号：
070305 ; 080501 ; 081704 ;
摘要：
In order to improve the solution processability of 4,7-bis(thiophen-2-yl) benzo[c][1,2,5] thiadiazole (DTBT)-based polymers, novel donor-acceptor polymer PTOBDTDTBT containing DTBT and benzo[1,2-b: 4,5-b']dithiophene (BDT) with conjugated side chain is designed and synthe-sized with narrow band gap 1.67 eV and low lying HOMO energy level -5.4 eV. The blend film of PTOBDTDTBT and PC 71 BM exhibits uniform and smooth film with root-mean-square (RMS) surface roughness 1.15 nm because of the excellent solubility of PTOBDTDTBT when six octyloxy side chains are introduced. The hole mobility of the blend film is measured to be 4.4 x 10(-5) cm(2) V-1 s(-1) by the space-charge-limited current (SCLC) model. The optimized polymer solar cells (PSCs) based on PTOBDTDTBT/PC71BM exhibits an improved PCE of 6.21% with V-oc = 0.80 V, J(sc) = 11.94 mA cm(-2) and FF = 65.10%, one of the highest PCE in DTBT containing polymers.
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页码：1153 / 1157
页数：5
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