ABSTRACT
This chapter provides a comprehensive summary of previous morphological studies, including the origin of morphology difference, correlations between the film morphology and processing conditions, and correlations between the film morphology and physical properties of polymer thin films. It discusses some fundamental aspects regarding how the processing conditions could change the polymer morphology. The chapter presents a general discussion on how the film morphology would affect the electrical and optical properties of the polymer thin films. It also discusses use of dilution effects to improve the device performance. Conjugated polymers are semiconductors with the optical and electrical properties similar to the traditional inorganic semiconductors. The polymer materials can be dissolved in ordinary organic solvents and deposited on to substrates as thin films through simple coating techniques such as spin-coating, ink-jet printing, and screen printing.
