Experimental Characterization of Charge and Exciton Transport in Organic Semiconductors

This chapter describes experimental approaches for determining the key charge and exciton transport properties in organic semiconductors. Relevant theories are developed in terms of measureable, experimental quantities, revealing the underlying connections between nanoscopic charge and exciton transfer and the mesoscopic behavior observed in organic semiconductors. Even though the fundamental particles are different, accurately describing both charge and exciton transport requires an understanding of how the nature of the sample and the magnitude of the desired transport property affect proper technique selection and data interpretation. Furthermore, a quantitative description of both charge and exciton transport properties is required for each organic layer in order to develop accurate models for organic photovoltaic (OPV) and organic light-emitting diode (OLED) device operation. Combining detailed descriptions and comparisons for the most common measurement techniques with specific case studies allows for a broad working knowledge of exciton and charge transport.