Carrier Mobility Measurement

Various techniques will be discussed for the evaluation of the carrier mobility such as a time-of-flight method, a transient ient current observation, a surface potential decay method, galvanomagnetic effects and a breakdown time-lag measurement. Their applications to various materials, polymers, liquids, and liquid crystals will be pointed out. Especially, it has been revealed that the carrier mobility in polymers is strongly y dependent on both the measuring technique and the time range of interest: this is interpreted in terms of non-Gaussian carrier transport and severe influence of morphology and impurities. Effects of elongation, doping, and heattreatment also are discussed.