Relationship between the crystal structures and transistor performance of organic semiconductors

Abstract

Organic Field-Effect transistors (OFETs) have several advantages such as low cost, flexibility, and large-area fabrication. High performance of transistor means high mobility, large on/off ratio, low threshold voltage, and high stability. To achieve the high performance, the development of new organic semiconductors is essential. The performance is dependent on the crystal structures of organic semiconductors. The relationship between them is described here, giving a guideline for molecular design. In thin-film transistors, polycrystalline films are necessary for strong intermolecular interactions leading to highmobility. Two-Dimensional crystal structures are favorable for carrier transportation to reduce the grain boundary effects. Herringbone structures have an advantage of Two-Dimensional structures. In -stacking structures, two-dimensional structures are achieved by the formation of Two-Dimensional columns or using interheteroatom interactions.