ABSTRACT
This chapter outlines how the analysis of the capacitance of organic devices as function of applied bias, frequency, and modulation intensity can be used to obtain useful material parameters. Organic semiconductors (OSCs) are an appealing class of materials because they are solution processable and can be deposited by means of cost-effective printing methods, thus having the possibility to address large areas and flexible substrates. OSCs can be classified as single small molecules, oligomers and polymers. The condition of constant mobility is highly idealized and is rarely encountered in OSCs: carrier mobility is very often found to depend both on the carrier density and on the electric field. The chapter considers the case of a Schottky contact between a metal and a semiconductor, and assumes that a depleted space charge region exists close to the metal/semiconductor interface. It reviews the main applications of capacitive techniques in the field of organic semiconductors.
