Charge carrier mobility in an organic-inorganic hybrid nanocomposite

Choudhury, Kaushik Roy; Winiarz, Jeffrey G.; Samoc, Marek; Prasad, Paras N.
January 2003
Applied Physics Letters;1/20/2003, Vol. 82 Issue 3, p406
Academic Journal
Organic-inorganic hybrid materials are media for electronic and optoelectronic applications. We present a study of the electronic transport in such a model nanoparticle-sensitized hybrid organic-inorganic photorefractive host system, consisting of poly(N-vinylcarbazole) doped with quantum dots of cadmium sulfide, using standard time-of-flight techniques. The photocurrent transients exhibit features typical of dispersive transport in an amorphous semiconductor. The hole mobility depends strongly on the electric field and temperature indicating Poole-Frenkel-like activated hopping transport; a thickness dependence of the mobility is observed. The presence of nanoparticles does not lead to increased trapping of holes. Conversely, a surprising result is observed: the mobility actually increases with the increase of nanoparticle concentration even though it is well below the percolation limit.


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