Pentacene-based OFETs' Materials And Device

Organic Thin Film transistors (OFETs) are transistors device using organic semiconductor materials as active layers, and have got various interesting from scientist and industry. Compared with common inorganic transistors, because of the relatively low mobility of the organic semiconductor layers, OFETs cannot rival the performance of FETs based on single-crystalline inorganic semiconductors, such as Si and Ge, which have charge carrier mobilities (μ) about three orders of magnitude higher, though OFETs are not suitable for use in applications requiring very high switching speeds, but they have two distinct advantages: low cost over a large area and low temperature fabrication on a flexible substrate, these suggest that they can be competitive for existing or novel thin-film-transistor applications requiring large-area coverage, structural flexibility, low-temperature processing, and, especially, low cost, such as flexible flat panel displays, electronic papers, radio frequency identification tags, sensors and smart cards. Thin film transistors (TFTs) based on hydrogenated amorphous silicon (a-Si:H) currently dominate these low-cost, large-area electronics market, however, high performance a-Si:H TFTs require process temperatures>200°C and therefore have limited compatibility with polymeric substrates, on the other hand, OFETs offer an attractive low-temperature alternative.This thesis review recent progress in materials, fabrication processes, device designs, and applications related to OFETs, and introduce the theory of OFETs including carriers transport mechanics, carriers' injection theory and so on. The principle simulation gives some interest results. This thesis report the synthesis and characterization of pentacene, report the investigation of the pentacene thin films affected by the deposition rate and substrates temperature, and the pentacene OFETs device fabrication, and the p-Si/pentacene/Al diode structure device fabrication. This thesis also review the novel pentacene related materials, and introduce our principle solution fabrication strategy of pentacene films. At the end, we give a shortly prospect of future work.