TY  - JOUR
A1  - Li, Wentao
A1  - Abrecht, Steve
A1  - Yang, Liqiang
A1  - Roland, Steffen
A1  - Tumbleston, John R.
A1  - McAfee, Terry
A1  - Yan, Liang
A1  - Kelly, Mary Allison
A1  - Ade, Harald W.
A1  - Neher, Dieter
A1  - You, Wei
T1  - Mobility-controlled performance of thick solar cells based on fluorinated copolymers
T2  - Journal of the American Chemical Society
N2  - 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.
Y1  - 2014
UR  - https://publishup.uni-potsdam.de/frontdoor/index/index/docId/37406
SN  - 0002-7863
VL  - 136
IS  - 44
SP  - 15566
EP  - 15576
PB  - American Chemical Society
CY  - Washington
ER  -