UNIFORMITY EVALUATION OF MESFET'S FOR GaAs LSI FABRICATION.

被引:0
|
作者
Matsuoka, Yutaka [1 ]
Ohwada, Kuniki [1 ]
Hirayama, Masahiro [1 ]
机构
[1] NTT, Atsugi Electrical Communication, Lab, Atsugi, Jpn, NTT, Atsugi Electrical Communication Lab, Atsugi, Jpn
关键词
INTEGRATED CIRCUITS; LSI; -; Manufacture;
D O I
暂无
中图分类号
TN [电子技术、通信技术];
学科分类号
0809 ;
摘要
Studies were made on GaAs MESFET I-V characteristic scattering using self-aligned FETs on semi-insulating substrates. Surface treatment before gate-metal evaporation was found to have a satisfactory effect on FET drain current. The two main factors of threshold-voltage scattering in self-aligned FETs were clarified. One is the lack of uniformity in gate lengths, and the other is substrate nonuniformity. An analytical method was proposed to distinguish between threshold-voltage dispersions attributed to the factors without direct measurement of the gate lengths. Threshold-voltage scattering due to crystal inhomogeneity was estimated for both LEC and HB substrates, and for both the entire area of a 2-in wafer and an area as small as 400 mu m**2.
引用
收藏
页码:1062 / 1067
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