Hole Transport In Films Research Articles

Room-temperature nondispersive hole transport in a discotic liquid crystal

The authors report on room-temperature nondispersive hole transport in films of a discotic liquid crystalline hexa-peri-hexabenzocoronene derivative studied by the time-of-flight technique. Hole mobilities in the order of 10−3cm2∕V−1s−1 have been determined and results of field- and temperature-dependent measurements could be well explained within the concept of charge transport by hopping in a one-dimensional manifold of transport sites formed by the columns of the discotic liquid crystal.

Non-dispersive Hole Transport in a Soluble Poly(p-phenylene vinylene)

Understanding the relationship between charge transport and morphology is critical for improving the efficiency of conjugatcd polymer-based devices. Time of flight measurements are used here to examine hole transport in films of poly(2-methoxy-5-(2'-ethylhexoxy)-1,4,-phenylene) (MEH-PPV). Films cast from three different solvents, toluene, p-xylene. and chlorobenzene, are investigated. It is shown that the MEH-PPV films can exhibit either nondispersive or dispersive transport. depending on the solvent used.

Structure and Carrier-Transport in a-Si:H, a-Si(Ge): H Films Prepared by Chemical Annealing

AbstractThe stability and opto-electric properties of a-Si:H films fabricated by “chemical annealing (CA)” with excited states of He (He*) were systematically investigated. The films made by the CA mode showed a high photoconductivity due to a low level of defect density, 2×1015cm-3, and improvement in the stability against light soaking. A marked improvement was also found in the hole-transport in films fabricated by the CA. The structural relaxation on the growing surface was also enhanced by addition of a small amount of Ge.