Patent ID: 7732265
Filing Date: 2010-06-08
Classification: H01L

Abstract:
1. A method for manufacturing a bottom gate type thin film transistor having a gate electrode, a gate insulating film, an oxide semiconductor active layer, a source electrode and a drain electrode on a flexible plastic substrate of a supporting substrate, comprising: continuously forming the gate insulating film and the oxide semiconductor active layer on the flexible plastic substrate with the gate electrode inside a vacuum film formation chamber of a film formation apparatus, the apparatus being a type of continuously winding up the roll-shaped substrate, and the gate insulating film and the oxide semiconductor active layer formed without being exposed to air, arranging the flexible plastic substrate on a film formation roll in the vacuum film formation chamber, and forming the gate insulating film and the oxide semiconductor active layer on the film formation roll, wherein the gate insulating film and the oxide semiconductor active layer are formed in this order with the film formation roll rotated, wherein targets for the gate insulating film and targets for the semiconductor active layer respectively have a plurality of targets, and wherein the number of the targets for the gate insulating film is more than the number of the targets for the semiconductor active layer.