Abstract
The present manuscript demonstrates the hole transport mechanism in an organic/inorganic hybrid system based on in-situ grown cadmium telluride (CdTe) nanocrystals in a poly(3-hexylthiophene) (P3HT) matrix. The increase of hole current in the hybrid system is correlated with the formation of a host-guest (P3HT-CdTe) charge transfer complex duly supported by photoluminescence quenching. The hole transport mechanism in P3HT is governed by a space charge limited current with temperature, carrier density, and field dependent mobility. Incorporation of CdTe nanocrystals in a polymer matrix results in enhancement in the value of trap density H(b) from 2.8 x 10(18) to 5.0 x 10(18) cm(-3) and reduction in activation energies from 52 meV to 11 meV. At high trap density, trap potential wells start overlapping; this results in decrease of activation energies. (C) 2011 American Institute of Physics. [doi:10.1063/1.3594647]