Energy-Level Alignment Governs Doping-Related Fermi-Level Shifts in Polymer Films
Fengyang Hu,
Melissa Berteau-Rainville,
Hannes Hase
et al.
Abstract:In thin films of doped organic semiconductors, the position
of
the Fermi level (E
F) within the semiconductor
fundamental gap depends not only on the dopant loading but also on
the energy-level alignment with the substrate. We show that the energy-level
alignment of the prototypical conjugated polymer poly(3-hexylthiophene)
(P3HT) with the common electrode material indium–tin oxide
puts E
F far from the midgap and close
to the highest occupied molecular orbital (HOMO) level of P3HT already
for undoped films, w… Show more
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