Thin film transistor and method for fabricating the same

Active solid-state devices (e.g. – transistors – solid-state diode – Field effect device – Having insulated electrode

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257332, 257347, 257401, 438149, 438230, 438270, H01L 2972

Patent

active

061076627

ABSTRACT:
A thin film transistor (TFT) and a method for fabricating the same utilize a sidewall spacer and a trench to improve the reliability of the device. The TFT includes a substrate, a trench formed in the substrate, and an active layer formed on the substrate and in the trench. A sidewall spacer is formed on the active layer along at least one side of the trench. A gate insulating film is formed over the sidewall spacer and the active layer. A gate electrode is formed on the gate insulating film in the trench. Source and drain electrodes are formed in the active layer or opposite sides of the gate electrode.

REFERENCES:
patent: 5298780 (1994-03-01), Harada
patent: 5334862 (1994-08-01), Manning et al.
patent: 5617502 (1997-04-01), Ort et al.
patent: 5736435 (1998-04-01), Venkatesan et al.
patent: 5763285 (1998-06-01), Yang
patent: 5780325 (1998-07-01), Lee
Hayden, J.D., Cooper, K.J., Roth, S.S., Kirsch, H.C., "A New Technical Toridal TFT Structure for Future Generation SRAMs," International Electron Devices Meeting Technical Digest, Dec., 1993.

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