Selenophene vs. thiophene in benzothiadiazole-based low energy gap donor-acceptor polymers for photovoltaic applications

被引：70

作者：

Alghamdi, Abdulaziz A. B. ^{[1
]}

Watters, Darren C. ^{[2
]}

Yi, Hunan ^{[1
]}

Al-Faifi, Solyman ^{[1
,3
]}

Almeataq, Mohammed S. ^{[1
]}

Coles, David ^{[2
]}

Kingsley, James ^{[2
]}

Lidzey, David G. ^{[2
]}

Iraqi, Ahmed ^{[1
]}

机构：

[1] Univ Sheffield, Dept Chem, Sheffield S3 7HF, S Yorkshire, England

[2] Univ Sheffield, Dept Phys & Astron, Sheffield S3 7RH, S Yorkshire, England

[3] King Abdulaziz Univ, Dept Chem, Jeddah 21589, Saudi Arabia

来源：

JOURNAL OF MATERIALS CHEMISTRY A | 2013年 / 1卷 / 16期

基金：

英国工程与自然科学研究理事会;

关键词：

LOW-BANDGAP POLYMER; SOLAR-CELLS; COPOLYMERS; EFFICIENCY; MOBILITY;

D O I：

10.1039/c3ta00122a

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 series of low energy gap polymers comprising 2,7-linked carbazole or fluorene units flanked by thiophene or selenophene repeat units as alternating donor units and benzothiadiazole with or without alkoxy substituents as alternating acceptor repeat units is reported. The effects of replacing thiophene with selenophene in this series of polymers on their optical, electrochemical and photovoltaic device performance when fabricated into bulk heterojunction solar cells using PC70BM as an acceptor are investigated. Power conversion efficiencies (PCEs) ranging from 3.34 to 5.41% are obtained with these systems. Thiophene-based polymers are found to have higher efficiency compared to comparable selenophene-based polymers. We tentatively explain such differences on the basis of reduced molar absorbance and reduced charge-carrier mobility in the selenophene-based polymers.

引用

页码：5165 / 5171

页数：7

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