Keywords: 
• 有机场效应晶体管 /
• CuI/Al双层源漏电极 /
• 电子转移

Abstract: An organic field-effect transistor based on pentacene semiconductor with CuI/Al bilayer electrode is investigated.The CuI layer,directly contacting the organic semiconductor layer,serves as the hole-injection layer.The overcoated metal layer is responsible for the reduction in contact barrier.Compared with the device with a single metal （Al,Au） layer used as the source-drain electrode,the device with CuI/Al electrodes considerably improves the hole mobility and the on/off current ratio and greatly reduces the threshold voltage.Results of X-ray photoelectron and ultraviolet/visible absorption studies reveal that the reduction in the contact barrier can be attributed to an electron transfer from pentacene and Al to CuI.