Conjugated Block Copolymer Photovoltaics with near 3% Efficiency through Microphase Separation
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- 作者：Changhe Guo ; Yen-Hao Lin ; Matthew D. Witman ; Kendall A. Smith ; Cheng Wang ; Alexander Hexemer ; Joseph Strzalka ; Enrique D. Gomez ; Rafael Verduzco
- 刊名：Nano Letters
- 出版年：2013
- 出版时间：June 12, 2013
- 年：2013
- 卷：13
- 期：6
- 页码：2957-2963
- 全文大小：345K
- 年卷期：v.13,no.6(June 12, 2013)
- ISSN：1530-6992
文摘
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鈥揳cceptor 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鈥揳cceptor interfaces.