Patent ID: 6080606
Filing Date: 2000-06-27
Classification: G02F,H01L

Abstract:
A method for producing thin film transistors, comprising the steps of:electrophotographically printing a negative source-drain pattern on a clean substrate in the form of toner, thereby initiating the formation of a stack;post-baking the toner;depositing an electrical conductor on the above;dissolving the toner with a solvent to lift off the portion of the conductor deposited on the toner;depositing amorphous silicon on top of the stack;depositing gate insulator on the top and passivation on the bottom of the stack;depositing photoresist on top of the stack;applying a negative gate toner pattern to the top of the stack;exposing the photoresist to ultraviolet light;developing the photoresist;depositing an electrical conductor on the top of the stack;lifting-off the conductor deposited over the toner and photoresist by exposing the stack to a stripper;applying photoresist to the top of the stack;applying to the top of the stack a positive toner pattern for contact hole opening and transistor separation;exposing the photoresist to ultraviolet light;developing the photoresist;etching the exposed gate insulator and amorphous silicon; andstripping the photoresist and toner to obtain the desired thin film transistors.