Properties of TaNxfilms as diffusion barriers in the thermally stable Cu/Si contact systems
作者:
Mayumi Takeyama,
Atsushi Noya,
Touko Sase,
Akira Ohta,
Katsutaka Sasaki,
期刊:
Journal of Vacuum Science&Technology B: Microelectronics and Nanometer Structures Processing, Measurement, and Phenomena
(AIP Available online 1996)
卷期:
Volume 14,
issue 2
页码: 674-678
ISSN:1071-1023
年代: 1996
DOI:10.1116/1.589155
出版商: American Vacuum Society
关键词: THIN FILMS;COPPER;SILICON;INTERFACES;TANTALUM NITRIDES;ATOM TRANSPORT;DIFFUSION;CHEMICAL COMPOSITION;THERMODYNAMIC PROPERTIES;ANNEALING;TEMPERATURE DEPENDENCE;TEMPERATURE RANGE 0400−1000 K;TaNx;Cu;Si
数据来源: AIP
摘要:
The properties of Ta2N and TaN compound films as a diffusion barrier between Cu and Si have been investigated by examining compositional depth profiles obtained by Auger electron spectroscopy. The use of a Ta2N barrier is effective for improving the thermal stability of the contact system by raising the silicide formation temperature as compared with the use of a Ta barrier. The contact system of Cu/TaN/Si is fairly stable due to annealing for 1 h even at 750 °C. This is interpreted by the stability of the TaN compound, which is chemically inert to Si as well as Cu at this temperature. Eliminating the grain growth of TaN due to annealing is also effective for suppressing the physical diffusion through the barrier.
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