Thin
Films of Highly Planar Semiconductor Polymers
Exhibiting Band-like Transport at Room Temperature
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Abstract
We
report the observation of band-like transport from printed polymer
thin films at room temperature. This was achieved from donor-acceptor
type thiophene-thiazole copolymer that was carefully designed to enhance
the planarity of the backbone and the resulting transfer integral
between the macromolecules. Due to the strong molecular interaction,
the printed polymer film exhibited extremely low trap density comparable
to that of molecular single crystals. Moreover, the energy barrier
height for charge transport could be readily reduced with the aid
of electric field, which led formation of extended electron states
for band-like charge transport at room temperature