Fishing – trapping – and vermin destroying
Patent
1993-06-07
1995-05-09
Fourson, George
Fishing, trapping, and vermin destroying
437 93, 437 39, 437912, 437927, H01L 21338
Patent
active
054139473
ABSTRACT:
A compound semiconductor device is disclosed which comprises a crystally grown buffer layer formed on a semi-insulating semiconductor substrate provided with an insulating layer. The crystal growth characteristics are such that the insulating layer does not allow crystal growth on its upper surface. During its growth, the buffer layer makes reverse sloped side edges which join to form a void. A gate electrode formed above the void separates a channel from the substrate. In the .delta.-MESFET, side walls are formed at both sides of the gate electrodes and an N.sup.+ -well region is formed by using the side walls as an ion implanting mask. Accordingly, the void separates the channel from the semiconductor substrate, thereby preventing leakage current through the buffer layer, backgating effects in an integrated circuit, and completing crystal growth without an undue effort for lowering the impurity concentration of the buffer layer. Moreover, the ion implantation for forming the well region can be performed by utilizing the gate electrode and the side walls as a mask without an ion implantation mask, thus simplifying the manufacturing process.
REFERENCES:
patent: 4178197 (1979-12-01), Marinace
patent: 4546540 (1985-10-01), Ueyanagi et al.
patent: 5001077 (1991-03-01), Sakai
Chang-Tae Kim, et al., "A GaAs MESFET with Very Short Channel Length Fabricated . . . ", Extended Abstracts of the 1991 International Conference on Solid State Devices and Materials, Yokohama, 1991, pp. 399-401.
Kim Seok T.
Kim Yo J.
Kim Young S.
Donohoe Charles R.
Fourson George
Samsung Electronics Co,. Ltd.
Westerlund, Jr. Robert A.
Whitt Stephen R.
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