Journal
NANO LETTERS
Volume 11, Issue 3, Pages 1036-1039Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nl200056p
Keywords
Organic solar cell; polymer; bulk heterojunction; cross-section transmission electron microscopy; nanomorphology
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Funding
- National Science Foundation [NSF-DMR-0856060]
- Department of Energy [DOE-ER46535]
- Direct For Mathematical & Physical Scien [0856060] Funding Source: National Science Foundation
- Division Of Materials Research [0856060] Funding Source: National Science Foundation
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Bulk heterojunction (BIT) layers based on poly(3-hexyl.thiophene-2,5-diyl) (P3HT) and [6,6]-phenyl C61 butyric acid methyl ester (PCBM) were fabricated by two methods: codeposition of P3HT/PCBM from a common solvent (conventional BHJ) and by sequential, layer-by-layer deposition of P3HT/PCBM from separate solvents (layer-evolved BHJ). Thermally annealed layer-evolved BHJ solar cells show power conversion efficiencies and electron/hole mobilities comparable to conventional BHJ solar cells. The nanomorphology of both active layers is compared in situ by transmission electron microscopy (TEM) using a multilayer cross-sectional sample architecture. No significant difference is observed between the nanomorphology of the conventional BHJ and layer-evolved BHJ material implying that the bulk heterojunction forms spontaneously and that it is the lowest energy state of the two component system.
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