Photocurrent Enhancement from Diketopyrrolopyrrole Polymer Solar Cells through Alkyl-Chain Branching Point Manipulation

被引：261

作者：

Meager, Iain ^{[1
,2
]}

Ashraf, Raja Shahid ^{[1
,2
]}

Mollinger, Sonya ^{[4
]}

Schroeder, Bob C. ^{[1
,2
]}

Bronstein, Hugo ^{[5
]}

Beatrup, Daniel ^{[1
,2
]}

Vezie, Michelle S. ^{[2
,3
]}

Kirchartz, Thomas ^{[2
,3
]}

Salleo, Alberto ^{[4
]}

Nelson, Jenny ^{[2
,3
]}

McCulloch, Iain ^{[1
,2
]}

机构：

[1] Univ London Imperial Coll Sci Technol & Med, Dept Chem, London SW7 2AZ, England

[2] Univ London Imperial Coll Sci Technol & Med, Ctr Plast Elect, London SW7 2AZ, England

[3] Univ London Imperial Coll Sci Technol & Med, Dept Phys, London SW7 2AZ, England

[4] Stanford Univ, Dept Mat Sci & Engn, Stanford, CA 94305 USA

[5] UCL, Dept Chem, London WC1H 0AJT, England

来源：

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY | 2013年 / 135卷 / 31期

基金：

英国工程与自然科学研究理事会;

关键词：

SIDE-CHAINS; MOBILITY; TRANSISTORS; SEMICONDUCTORS; SUBSTITUTION; PERFORMANCE; COPOLYMERS; ORDER; HOLE;

D O I：

10.1021/ja406934j

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Systematically moving the alkyl-chain branching position away from the polymer backbone afforded two new thieno[3,2-b]thiophene diketopyrrolopyrrole (DPPTT-T) polymers. When used as donor materials in polyrner:fullerene solar cells, efficiencies exceeding 7% were achieved without the use of processing additives. The effect of the position of the alkyl-chain branching point on the thin-film morphology was investigated using X-ray scattering techniques and the effects on the photovoltaic and charge-transport properties were also studied. For both solar cell and transistor devices, moving the branching point further from the backbone was beneficial. This is the first time that this effect has been shown to improve solar cell performance. Strong evidence is presented for changes in microstructure across the series, which is most likely the cause for the photocurrent enhancement.

引用

页码：11537 / 11540

页数：4

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