Patent ID: 8716696

Claim:
A thin film transistor, comprising: a buffer layer directly on and contacting a surface of a single-layered glass substrate, the buffer layer formed of an inorganic insulating material or an organic insulating material and comprising a flat top surface; source and drain electrodes on the buffer layer, the source and drain electrodes being spaced apart from each other such that a portion of the buffer layer is exposed to a space between the source and drain electrodes; a small molecule organic semiconductor layer on the source and drain electrodes and contacting the exposed portion of the buffer layer; a gate insulating layer formed of an organic insulating material on the small molecule organic semiconductor layer; a gate electrode on the gate insulating layer; a passivation layer on the gate electrode and comprising a drain contact hole exposing the drain electrode; and a pixel electrode on the passivation layer and contacting the drain electrode through the drain contact hole, wherein the gate insulating layer, the small molecule organic semiconductor layer, and the gate electrode have substantially a same size in lateral dimension, wherein the inorganic insulating material for the buffer layer includes silicon oxynitride (SiO x N y ), wherein the source and drain electrodes includes poly ethylene dioxy thiophene: poly styrene sulfonate (PEDOT:PSS), wherein the small molecule organic semiconductor layer is a p-type semiconductor, wherein the organic insulating material for the gate insulating layer includes polyimide, and wherein the buffer layer provides a desirable surface roughness such that the small molecule organic semiconductor layer has a desirable crystallization characteristic.