Nano Letters · 2005 · 1.5K citations · 27 references
Natural SciencesMaterials EngineeringMaterials ScienceElectronic MaterialsSemiconductor MaterialsThin FilmsConducting PolymersConductive PolymersOrganic Electronic MaterialsOrganic SemiconductorsPhotovoltaic DevicesSolar CellsBulk Heterojunction Solar CellsCrystalline StructureEnergy Conversion EfficiencyFilm MorphologyNanocomposite FilmsPower ConversionPower Conversion EfficiencyTransmission Electron Diffraction
Transmission electron microscopy and electron diffraction are used to study the changes in morphology of composite films of poly(3-hexylthiophene) (P3HT) and a methanofullerene derivative (PCBM) in bulk heterojunction solar cells. Thermal annealing produces and stabilizes a nanoscale interpenetrating network with crystalline order for both components. P3HT forms long, thin conducting nanowires in a rather homogeneous, nanocrystalline PCBM film. Both the improved crystalline nature of films and increased but controlled demixing between the two constitutes therein after annealing explains the considerable increase of the power conversion efficiency observed in these devices.
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Hybrid Nanorod-Polymer Solar Cells
Wendy U. Huynh, Janke J. Dittmer, A. Paul Alivisatos · Science · 2002 · 5K citations
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