2, Shizuoka University, Hamamatsu, , Japan
Pentacene is one of the most extensively studied semiconducting materials for organic thin-film transistors (OTFTs) and has been still a benchmark material in this research field. Understanding the bottlenecks of carrier transport in pentacene OTFT is therefore important to maximize the performance of OTFTs using not only this benchmark material but also any semiconducting small molecules. In this presentation, the reality of the carrier transport band and traps in practical polycrystalline organic thin films is explained by making pentacene into a representative case . The major topics included are as follows: grain morphology and crystal structure of pentacene thin films, energy barriers at grain boundaries, potential fluctuation in a grain, equations to express the overall carrier mobility in polycrystalline films, carrier traps at organic/insulator interface, and influence of surface chemical modification on the electronic structures.
 R. Matsubara et al.: Chapter 10, Mobility limiting factors in practical polycrystalline organic thin films in Electronic Processes in Organic Electronics: Bridging Nanostructure, Electronic States and Device Properties, ed. H. Ishii et al., pp. 185–225, Springer, 2014.