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SiC via fabrication for wide-band-gap high electron mobility transistor/microwave monolithic integrated circuit devices.
- Source :
- Journal of Vacuum Science & Technology: Part B-Microelectronics & Nanometer Structures; Mar/Apr2008, Vol. 26 Issue 2, p487-494, 8p, 4 Color Photographs, 6 Diagrams, 4 Graphs
- Publication Year :
- 2008
-
Abstract
- A process for achieving high yield of SiC through wafer via holes without trenching or micromasking and with excellent electrical connection after subsequent metal plating across full wafers was developed for use in high electron mobility transistors (HEMTs) and microwave monolithic integrated circuits (MMICs) using an inductively coupled plasma etch. Consideration was given to the choice of wafer platen, hard mask, gas chemistry, surface treatments, and plasma parameters in order to achieve an acceptable etch rate while at the same time minimizing trenching and micromasking that can harm via yield. In addition, the issue of wafer thickness variation and etch nonuniformity leading to punch through of Au pads at the bottom of the vias was addressed by the addition of a metal layer to the front side of the wafer. The etch rate achieved for 25% of a 2 in. diameter wafer is approximately 3800 Å/min while demonstrating acceptable levels of trenching and micromasking with little or no Au punch through. The final process has been demonstrated to achieve >95% yield across a full 2 in. diameter, 100 μm thick wafer with a high density of vias. [ABSTRACT FROM AUTHOR]
- Subjects :
- SILICON carbide
TRANSISTORS
SEMICONDUCTOR wafers
GOLD
PLASMA etching
Subjects
Details
- Language :
- English
- ISSN :
- 10711023
- Volume :
- 26
- Issue :
- 2
- Database :
- Complementary Index
- Journal :
- Journal of Vacuum Science & Technology: Part B-Microelectronics & Nanometer Structures
- Publication Type :
- Academic Journal
- Accession number :
- 31696230
- Full Text :
- https://doi.org/10.1116/1.2837849