Mobility-Controlled Performance of Thick Solar Cells Based on Fluorinated Copolymers

被引：248

作者：

Li, Wentao ^{[1
]}

Abrecht, Steve ^{[2
]}

Yang, Liqiang ^{[3
]}

Roland, Steffen ^{[2
]}

Tumbleston, John R. ^{[4
]}

McAfee, Terry ^{[4
]}

Yan, Liang ^{[1
]}

Kelly, Mary Allison

Ade, Harald ^{[4
]}

Neher, Dieter ^{[2
]}

You, Wei ^{[1
,3
]}

机构：

[1] Univ N Carolina, Dept Chem, Chapel Hill, NC 27599 USA

[2] Univ Potsdam, Inst Phys & Astron, D-14476 Potsdam, Germany

[3] Univ N Carolina, Dept Appl Phys Sci, Chapel Hill, NC 27599 USA

[4] N Carolina State Univ, Dept Phys, Raleigh, NC 27615 USA

来源：

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY | 2014年 / 136卷 / 44期

基金：

美国国家科学基金会;

关键词：

OPEN-CIRCUIT VOLTAGE; DONOR POLYMERS; SIDE-CHAINS; MOLECULAR-ORIENTATION; CHARGE SEPARATION; RECOMBINATION; MORPHOLOGY; SUBSTITUENTS; CRYSTALLINITY; MISCIBILITY;

D O I：

10.1021/ja5067724

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Developing novel materials and device architectures to further enhance the efficiency of polymer solar cells requires a fundamental understanding of the impact of chemical structures on photovoltaic properties. Given that device characteristics depend on many parameters, deriving structureproperty relationships has been very challenging. Here we report that a single parameter, hole mobility, determines the fill factor of several hundred nanometer thick bulk heterojunction photovoltaic devices based on a series of copolymers with varying amount of fluorine substitution. We attribute the steady increase of hole mobility with fluorine content to changes in polymer molecular ordering. Importantly, all other parameters, including the efficiency of free charge generation and the coefficient of nongeminate recombination, are nearly identical. Our work emphasizes the need to achieve high mobility in combination with strongly suppressed charge recombination for the thick devices required by mass production technologies.

引用

页码：15566 / 15576

页数：11

共 54 条

[11] Miscibility, Crystallinity, and Phase Development in P3HT/PCBM Solar Cells: Toward an Enlightened Understanding of Device Morphology and Stability [J].