Origin of the modified electronic properties of Au formed on pentacene

Abstract

A An film formed on a pentacene layer, as a model system of a metal contact on a pentacene-based field-effect transistor, has been investigated. Unexpected pentacene derivatives and coarse morphology depending on the An thickness are suggested as origins of the abnormal electronic structure of the An film and the poor reproducibility of organic-based devices. The morphology of the An film shows a strong dependency on the An coverage. At 600 A of Art, a lift of the pentacene layer is shown as a result of deformation of the cracked An film induced by a relaxation of the intergranular stresses accumulated during the growth process.