Conjugated Block Copolymer Photovoltaics with near 3% Efficiency through Microphase Separation

被引:250
作者
Guo, Changhe
Lin, Yen-Hao
Witman, Matthew D.
Smith, Kendall A.
Wang, Cheng
Hexemer, Alexander [1 ]
Strzalka, Joseph [2 ]
Gomez, Enrique D.
Verduzco, Rafael
机构
[1] Univ Calif Berkeley, Lawrence Berkeley Natl Lab, Adv Light Source, Berkeley, CA 94720 USA
[2] Argonne Natl Lab, Xray Sci Div, Argonne, IL 60439 USA
基金
美国国家科学基金会;
关键词
Self-assembly; organic solar cells; all conjugated block copolymers; RSOXS; GIWAXS; POLYMER SOLAR-CELLS; OPEN-CIRCUIT VOLTAGE; ORGANIC PHOTOVOLTAICS; DIBLOCK COPOLYMERS; EXCITON DIFFUSION; CHARGE; BLENDS; POLY(3-HEXYLTHIOPHENE); MORPHOLOGY; COMPATIBILIZERS;
D O I
10.1021/nl401420s
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
Organic electronic materials have the potential to impact almost every aspect of modern life including how we access information, light our homes, and power personal electronics. Nevertheless, weak intermolecular interactions and disorder at junctions of different organic materials limit the performance and stability of organic interfaces and hence the applicability of organic semiconductors to electronic devices. Here, we demonstrate control of donor acceptor heterojunctions through microphase-separated conjugated block copolymers When utilized as the active layer of photovoltaic cells, block copolymer based devices demonstrate efficient photoconversion well beyond devices composed of homopolymer blends. The 3% block copolymer device efficiencies are achieved without the use of a fullerene acceptor. X-ray scattering results reveal that the remarkable performance of block copolymer solar cells is due to self-assembly into mesoscale lamellar morphologies with primarily face on crystallite orientations. Conjugated block copolymers thus provide a pathway to enhance performance in excitonic solar cells through control of donor acceptor interfaces.
引用
收藏
页码:2957 / 2963
页数:7
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