期刊
NANO LETTERS
卷 14, 期 9, 页码 5238-5243出版社
AMER CHEMICAL SOC
DOI: 10.1021/nl502209s
关键词
Morphology; Hierarchical Assembly; Polymer Nanoparticles; Organic Photovoltaics; Random Assembly; Aqueous Dispersions
类别
资金
- U. S. National Science Foundation MRSEC on Polymers [DMR-0820506]
- U. S. National Science Foundation [MRI-0923105]
- Polymer-Based Materials for Harvesting Solar Energy (PHaSE), an Energy Frontier Research Center - U. S. Department of Energy, Office of Science, Basic Energy Sciences [DE-SC0001087]
We address here the need for a general strategy to control molecular assembly over multiple length scales. Efficient organic photovoltaics require an active layer comprised of a mesoscale interconnected networks of nanoscale aggregates of semiconductors. We demonstrate a method, using principles of molecular self-assembly and geometric packing, for controlled assembly of semiconductors at the nanoscale and mesoscale. Nanoparticles of poly(3-hexylthiophene) (P3HT) or [6,6]-phenyl-C-61-butyric acid methyl ester (PCBM) were fabricated with targeted sizes. Nanoparticles containing a blend of both P3HT and PCBM were also fabricated. The active layer morphology was tuned by the changing particle composition, particle radii, and the ratios of P3HT:PCBM particles. Photovoltaic devices were fabricated from these aqueous nanoparticle dispersions with comparable device performance to typical bulk-heterojunction devices. Our strategy opens a revolutionary pathway to study and tune the active layer morphology systematically while exercising control of the component assembly at multiple length scales.
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