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The effects of oxidation temperature on the capacitance–voltage characteristics of oxidized AlN films on Si

J. Kolodzey, E. A. Chowdhury, G. Qui, J. Olowolafe, C. P. Swann, K. M. Unruh, J. Suehle, R. G. Wilson, J. M. Zavada
1997 Applied Physics Letters  
The thermal oxidation of AlN thin films produces a high quality insulator which exhibits the gate voltage-controlled charge regimes of accumulation, depletion, and inversion on Si surfaces. The temperature dependence of oxidation is important for device processing. We report on the composition, structure, and electrical properties of the AlN versus the oxidization temperature. AlN layers 500 nm thick were deposited by rf sputtering on p-type Si ͑100͒ substrates, followed by oxidation in a
more » ... xidation in a furnace at temperatures from 800 to 1100°C with O 2 flow. An oxidation time of 1 h produced layers of Al 2 O 3 with small amounts of N having a thickness of 33 nm at 800°C, and 524 nm at 1000°C. Electrical measurements of metal-oxide-semiconductor capacitors indicated that the dielectric constant of the oxidized AlN was near 12. The best layer had a flatband voltage near zero with a net oxide trapped charge density less than 10 11 cm Ϫ2 . These results show that oxidized AlN has device-grade characteristics for the gate regions of field effect transistors, and for optoelectronic applications.
doi:10.1063/1.120510 fatcat:kbtvvcj2kzerto4lz2syicdywq