Thiophene-Fused Benzothiadiazole: A Strong Electron-Acceptor Unit to Build D-A Copolymer for Highly Efficient Polymer Solar Cells

被引：87

作者：

Zhou, Pengcheng ^{[1
]}

Zhang, Zhi-Guo ^{[2
]}

Li, Yongfang ^{[2
]}

Chen, Xingguo ^{[1
]}

Qin, Jingui ^{[1
]}

机构：

[1] Wuhan Univ, Key Lab Organ & Polymer Optoelect Mat, Wuhan 430072, Peoples R China

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

来源：

CHEMISTRY OF MATERIALS | 2014年 / 26卷 / 11期

基金：

高等学校博士学科点专项科研基金; 中国国家自然科学基金;

关键词：

PHOTOVOLTAIC PROPERTIES; CONJUGATED POLYMERS; CHARGE-TRANSPORT; LOW-BANDGAP; GAP; ENERGY; PERFORMANCE; DERIVATIVES; NAPHTHODITHIOPHENE; BENZODITHIOPHENE;

D O I：

10.1021/cm501052a

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

A novel strong electron-acceptor, thieno[2,3-f-]-2,1,3-benzothiadiazole-6-carboxylate (BTT), was first designed and synthesized. By introducing two thienyl groups into BTT and then copolymerizing with thienyl group substituted benzo[1,2-b:4,5-b']dithiophene (BDTT) unit, a low band gap D A copolymer (PBTT-TBDTT) was obtained. Compared with its polymer analogue (PBT-TBDTT) with benzothiadiazole (BT) as an acceptor, PBTT-TBDTT exhibits stronger intramolecular charge transfer. Thus, it shows much broader absorption covering almost the whole visible light region (in the range of 300-850 nm) and narrower optical band gap around 1.45 eV with a large IP (ionization potential) at 5.35 eV. The maximum efficiency of PBTT-TBDTT based device reaches 6.07% which is much higher than that of PBT-TBDTT (3.24%), indicating that BTT unit is a promising electron-acceptor moiety to construct low band gap D A copolymers for PSCs with high photovoltaic performances.

引用

页码：3495 / 3501

页数：7

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