Journal
ACS NANO
Volume 8, Issue 1, Pages 243-249Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nn4060539
Keywords
organic semiconductor; X-ray scattering; conjugated polymer; organic solar cell; crystalline polymer
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Funding
- U.S. Department of Energy, Basic Energy Sciences, at the Center for Functional Nanomaterials
- Materials Sciences and Engineering Division [DE-AC02-98CH10886]
- Energy Laboratory Research and Development Initiative at Brookhaven National Laboratory
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Nanostructured grating surfaces with groove widths less than 200 nm impose boundary conditions that frustrate the natural molecular orientational ordering within thin films of blended polymer semiconductor poly(3-hexlythiophene) and phenyl-C-61-butyric acid methyl ester, as revealed by grazing incidence X-ray scattering measurements. Polymer interactions with the grating sidewall strongly inhibit the polymer lamellar alignment parallel to the substrate typically found in planar films, in favor of alignment perpendicular to this orientation, resulting in a preferred equilibrium molecular configuration difficult to achieve by other means. Grating surfaces reduce the relative population of the parallel orientation from 30% to less than 5% in a 400 nm thick film. Analysis of in-plane X-ray scattering with respect to grating orientation shows polymer backbones highly oriented to within 10 degrees of parallel to the groove direction.
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