Microstructural study of Au-Pd-Zn ohmic contacts to p-type InGaAsP-InP |
| |
Authors: | P. Jian D. G. Ivey R. Bruce G. Knight |
| |
Affiliation: | (1) Department of Mining, Metallurgical and Petroleum Engineering, University of Alberta, T6G 2G6 Edmonton, Alberta, Canada;(2) Bell Northern Research, Ltd, Station C, PO Box 3511, K1Y 4H7 Ottawa, Ontario, Canada |
| |
Abstract: | A detailed microstructural study has been done on Au-Pd-Zn ohmic contacts to p-type InGaAsP epitaxially grown on InP. The doping level in the InGaAsP was 1.0 × 1019 to 1.5 × 1019 cm–3 near the surface with the Zn concentration graded to a value of 7 × 1018 cm–3 at the InGaAsP-InP interface. Metal layers (10 nm Pd,3 nmZn, 25 nm Pd and 50 nm Au) were deposited sequentially by electron beam evaporation. Contact resistances less than 10–4 cm2 were achieved for all annealing temperatures studied (380–440 C) and a minimum contact resistance of 2 × 10–6 cm2 was obtained for an anneal at 400 C for 20 s. Comparisons were made to similar metallizations on p-type InP. Lower contact resistances were achieved for the quaternary material compared with the binary material, however, contact stability and uniformity were worse. |
| |
Keywords: | |
本文献已被 SpringerLink 等数据库收录! |
|