TITLE

Molecular-weight-dependent mobilities in regioregular poly(3-hexyl-thiophene) diodes

AUTHOR(S)
Goh, Chiatzun; Kline, R. Joseph; McGehee, Michael D.; Kadnikova, Ekaterina N.; Fréchet, Jean M. J.
PUB. DATE
March 2005
SOURCE
Applied Physics Letters;3/21/2005, Vol. 86 Issue 12, p122110
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
We have investigated the transport properties in the direction perpendicular to the substrate of regioregular poly(3-hexyl-thiophene) of different molecular weights (MW) in a diode geometry. In these devices, which exhibit space-charge-limited behavior, we find that the mobility values at room temperature increase from 1.33×10-5 cm2/V s to 3.30×10-4 cm2/V s as the MW is increased from 2.9 to 31.1 kg/mol. The mobility is found to be field independent for high MW films, but field dependent for the low MW films. The current–voltage characteristics of the diodes are also studied as a function of temperature from 160 K to 300 K. The activation energy for carrier transport, extracted from the Arrhenius plot, is found to decrease gradually from 143 meV to 126 meV as the MW is increased.
ACCESSION #
16581672

 

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