Journal
CHEMISTRY OF MATERIALS
Volume 26, Issue 12, Pages 3747-3756Publisher
AMER CHEMICAL SOC
DOI: 10.1021/cm501251n
Keywords
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Funding
- University of New Mexico
- NSF [IIA-1301346]
- Center for Functional Nanomaterials - U.S. Department of Energy, Office of Basic Energy Sciences [DE-AC02-98CH10886]
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A novel methodology of precisely constructing stable and controllable conjugated polymer (CP)/fullerene nanostructures is presented. By building in noncovalent interactions between CP nanofibers (NFs) and fullerene derivatives, supramolecular polymer/fullerene composite NFs are obtained in solution for the first time. Specifically, a conjugated block copolymer having poly(3-hexylthiophene) (P3HT) backbone selectively functionalized with polar isoorotic acid (IOA) moieties, P1, is used as the building block. Self-assembly of P1 in mixed solvents leads to well-defined NFs decorated with IOA groups on the periphery, onto which phenyl-C61-butyric acid methyl ester (PCBM) molecules are subsequently attached noncovalently. Formation of such complex structures are studied in detail and confirmed by UV-vis absorption spectroscopy, transmission electron microscopy (TEM), atomic force microscopy (AFM), and X-ray scattering measurements. Application of these composite NFs in organic photovoltaic (OPV) devices not only leads to superior performance but also much improved thermal stability and better defined and controllable morphology, when compared with conventional bulk heterojunction (BHJ) devices.
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