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Direct evidence of gate oxide thickness increase in tungsten polycide processes

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4 Author(s)
Hsu, S.L. ; Taiwan Semicond. Manuf. Co., Hsin-Chu, Taiwan ; Liu, L.M. ; Lin, M.S. ; Chang, C.Y.

The increase of the effective gate oxide thickness for W-polycide processes is studied. The samples with as-deposited and annealed W polycide were analyzed by secondary ion mass spectrometry, transmission electron microscopy (TEM), and high-frequency CV measurements. The TEM cross section shows that the gate oxide thicknesses are approximately 244 and approximately 285 AA for as-deposited and 1000 degrees C annealed samples, respectively. The TEM results agree with those from CV measurements. The TEM analyses provide direct physical evidence of an additional oxide thickness ( approximately 41 AA) during the W-polycide annealing.<>

Published in:

Electron Device Letters, IEEE  (Volume:12 ,  Issue: 11 )

Date of Publication:

Nov. 1991

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