Carrier localization on surfaces of organic semiconductors gated with electrolytes.
Organic semiconductor single crystals gated with electrolytes exhibit a pronounced maximum in channel conductance at hole densities >10(13)   cm(-2). The cause is a strong decrease in the hole mobility with increasing charge density, which is explained in terms of a percolation model that incorporates trapping of holes by ions at the semiconductor-electrolyte interface. In the case of rubrene crystals, the peak channel conductance occurs at hole densities near 3 × 10(13)  cm(-2). The magnitude of the effect will be large for semiconductors with low dielectric constants and narrow bandwidths, and thus is likely to be a general phenomenon in organic semiconductors gated with electrolytes.
Xia
Yu
Y
Department of Chemical Engineering and Materials Science, University of Minnesota, Minneapolis 55455, USA.
Xie
Wei
W
Ruden
P Paul
PP
Frisbie
C Daniel
CD