A comprehensive understanding of the organic semiconductor material pentacene is meaningful for organic field effect transistors (OFETs).Thin films of pentacene are the most mobile molecular films known to date.This paper reported that the pentacene sample was successfully synthesized.The purity of pentacene is up to 95%.The results of a joint experimental investigation based on a combination of infrared absorption spectra,mass spectra (MS),element analysis,x-ray diffraction (XRD) and atom force microscopy (AFM).The authors fabricated OFET with the synthesized pentacene.Its field effect mobility is about 1.23cm2/(V·s) and on-off ratio is above 106.