Ultrathin Ta2O5 film growth by chemical vapor deposition of Ta(N(CH3)2)5 and O2 on bare and SiOxNy-passivated Si(100) for gate dielectric applications

被引:40
作者
Son, KA [1 ]
Mao, AY
Kim, BY
Liu, F
Pylant, ED
Hess, DA
White, JM
Kwong, DL
Roberts, DA
Vrtis, RN
机构
[1] Univ Texas, Ctr Mat Chem, Dept Chem & Biochem, Austin, TX 78712 USA
[2] Univ Texas, Ctr Microelect Res, Dept Elect & Comp Engn, Austin, TX 78712 USA
[3] Schumacher, Carlsbad, CA 92009 USA
来源
JOURNAL OF VACUUM SCIENCE & TECHNOLOGY A-VACUUM SURFACES AND FILMS | 1998年 / 16卷 / 03期
关键词
D O I
10.1116/1.581140
中图分类号
TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
We investigated Ta2O5 films grown by chemical vapor deposition of Ta(N(CH3)(2))(5) and O-2 both bare and SiOxNy-passivated Si(100) using x-ray photoelectron Spectroscopy, time-of-flight secondary-ion-mass spectroscopy (TOF-SIMS), and electrical measurements. The SiOxNy-passivated layer was formed by nitric oxide exposure to the Si substrate. Chemical composition of the Ta2O5 films is strongly dependent on the oxygen flow rate during film deposition; lower carbon levels and higher O/Ta ratios are observed for the films grown at higher O-2 flow rates. A corresponding leakage current decrease is observed for the films grown at a high O-2 flow rate. Compared to Ta2O5 films deposited on bare Si(100), the films deposited on SiOxNy-passivated layers show better electrical properties; with smaller equivalent thickness (Delta t(eq) similar to 6 Angstrom) one order of magnitude lower leakage current was measured. TOF-SIMS data indicate that SiOxNy layers (similar to 9 Angstrom) incorporate some oxygen during Ta2O5 deposition; however, regions where x=2, y=0 were not detected. Postdeposition annealing of Ta2O5/SiOxNy samples results in displacement of N by O in SiOxNy layers and oxidation of the Si substrate, forming SiO2. (C) 1998 American Vacuum Society.
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页码:1670 / 1675
页数:6
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