Journal
ORGANIC ELECTRONICS
Volume 14, Issue 5, Pages 1383-1390Publisher
ELSEVIER
DOI: 10.1016/j.orgel.2013.02.032
Keywords
Conjugated-polymer nanofiber; Fullerene; Polymer photovoltaics; Morphology stability; Spatial confinement
Funding
- National Science Foundation through CAREER [CHE 0931466]
- National Science Foundation through MRSEC [1121252]
- USTAR program of the State of Utah
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [1121252] Funding Source: National Science Foundation
- Division Of Chemistry
- Direct For Mathematical & Physical Scien [0931466] Funding Source: National Science Foundation
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A stable morphology in the photoactive layer is a prerequisite for increasing the lifetime of organic solar cells. Intense research efforts focusing on this research topic have typically resorted to complicated synthetic methods to reach this goal. Herein, the authors present a facile approach to directly achieve efficient polymer solar cells with a remarkably enhanced thermally stable morphology by constructing densely distributed poly(3-hexylthiophene) (P3HT) nanofibers in the pristine composite films with PCBM ([6,6]-phenyl-C61-butyric acid methyl ester) from solution without any post treatments. Controlled experiments reveal that the presence of numerous preformed P3HT nanofibers in the pristine films, with much larger size than P3HT and PCBM molecules, provides a fixed and rigid network to spatially confine the diffusion of PCBM molecules during thermal annealing, thus preventing the formation of large-scale PCBM crystals. This simple method represents a one-step way to prepare high performance photovoltaic devices with thermally stable morphologies and no necessary post treatments. (C) 2013 Elsevier B. V. All rights reserved.
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