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Keywords
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scherrer formula, single crystal, nanofiber, P3HT, crystallite,photovoltaic cell
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Abstract
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Scherrer formula was verified for the single crystals and nanofibers prepared from poly(3-hexylthiophene)(P3HT)-based homopolymers (non-hairy) and
block copolymers (hairy) with polystyrene, poly(methyl methacrylate), and poly(ethylene glycol) in toluene, xylene, and anisole. Despite the factthat he single crystals
were grown in very thicker dimensions (57-139 nm) compared to the nanofibers
(2-8 nm), the data obtained in the hexyl chains direction from atomic force microscopy and grazing wide angle X-ray scattering using Scherrer formula had a high
consistency for both hairy and non-hairy single crystals and nanofibers grown from
toluene. This adaption was detected only in toluene for the single crystals, however,
in toluene and xylene for the nanofibers. In a better solvent employed in the growth
environment, both single crystals and nanofibers were composed of lower number
of discrete crystallites in their thickness and longitude. The other effective parameters on the crystallite sizes inside the single crystals and nanofibers in both (100)
and (020) directions were the crystallization temperature, the molecular weight of
rigid P3HT block, and the end coily blocks. The longer P3HT backbones reflected the
thinner and shorter crystallitesassembled inside the single crystals (25-87 nm in hexyl chains and 48-166 nm in -stacking directions)
and nanofibers (2-7 nm in hexyl chains and 2-25 nm in -stacking directions). Finally, thin films of pre-developed structures were
employed as active layers in P3HT:phenyl-C71-butyric acid methyl ester (PC71BM) photovoltaic cells, and the device characteristics
were investigated.
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