Charge carrier mobility in amorphous organic semiconductors

An understanding of the mechanisms that control the mobility of charge carriers is central to the operation of organic semiconductor devices such as organic light-emitting diodes, field-effect transistors and solar cells. As an introduction into this research area, we present first a critical overview on experimental techniques available to measure charge carrier mobilities under various conditions. This is followed by a description of the pertinent theoretical concepts, illustrated by using representative experimental results. Finally we discuss current approaches taken to improve charge carrier mobility by controlling thin film morphologies.