Photovoltaic properties of poly(benzothiadiazole-thiophene-co-bithiophene) as donor in polymer solar cells

被引：27

作者：

Zhao, Guangjin ^{[1
,2
]}

He, Youjun ^{[1
]}

He, Chang ^{[1
]}

Fan, Haijun ^{[1
]}

Zhao, Yun ^{[1
]}

Li, Yongfang ^{[1
]}

机构：

[1] Chinese Acad Sci, Inst Chem, CAS Key Lab Organ Solids, Beijing Natl Lab Mol Sci, Beijing 100190, Peoples R China

[2] Henan Elect Power Res Inst, Zhengzhou 450052, Peoples R China

来源：

SOLAR ENERGY MATERIALS AND SOLAR CELLS | 2011年 / 95卷 / 02期

关键词：

Polymer solar cells; Low bandgap conjugated polymers; Conjugated polymer photovoltaic materials; Additives; Thermal annealing; DENSITY-FUNCTIONAL THEORY; EXCITATION-ENERGIES; OPTICAL-PROPERTIES; ELECTRON; EFFICIENCY; BAND; DERIVATIVES; ACCEPTOR; APPROXIMATION; ORGANIZATION;

D O I：

10.1016/j.solmat.2010.10.007

中图分类号：

TE [石油、天然气工业]; TK [能源与动力工程];

学科分类号：

0807 ; 0820 ;

摘要：

We report the photovoltaic properties of a D-A copolymer, poly(benzothiadiazole-thiophene-co-bithiophene) (PBTTbT), containing the donor (D) unit of oligothiophene with a hexyl side chain and the acceptor (A) unit of 2,1,3-benzothiadiazole (BT) with a methyl side chain. The geometry, electronic and absorption spectroscopic properties of bithiophene-benzothiadiazole-thiophene monomer (M1) of the polymer were investigated theoretically by the density functional theory (DFT) method for deep understanding the relationship of the structure and properties of the polymer. Polymer solar cells (PSCs) were fabricated with PBTTbT as an electron donor blended with [6,6]-phenyl-C71-butyric acid methyl ester (PC70BM) as an electron acceptor. The power conversion efficiency (PCE) of PSC is 0.87% for an optimized PBTTbT:PC70BM weight ratio of 1:3, under the illumination of AM 1.5, 100 mW/cm(2). With the additive of 1% 1,8-dioctanedithiol and thermal annealing at 130 degrees C for 15 min, the PCE of the device was improved to 1.98%. The efficiency improvement of the device was ascribed to a better morphology of the PBTTbT:PC70BM active layer with the additive and thermal annealing. (C) 2010 Elsevier B.V. All rights reserved.

引用

页码：704 / 711

页数：8

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