Abstract
This chapter evaluates the basic electric parameters of several kinds of organic thin films by in situ field-effect measurement. The effects of thermal treatment and introducing oxygen gas on the electrical properties are also investigated. A marked change in the electrical parameters corresponding to the adsorption and desorption of oxygen molecules was observed and the variation of the electrical properties strongly depended on the molecular structure and the growth conditions of the films. These results demonstrate that the influence of atmospheric gases is significant for organic device applications and the in situ field-effect measurement is a powerful method to investigate the fundamental properties of organic materials. In situ field-effect measurement is a promising method for the evaluation of conduction type (p or n), carrier mobility (μ), electrical conductivity (σ), and carrier concentration (N) of evaporated films.
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