Patent ID: 6232159
Filing Date: 2001-05-15
Classification: H01L

Abstract:
A method for fabricating a compound semiconductor device, comprising the steps of:a) depositing a first compound semiconductor layer over a substrate;b) depositing a second compound semiconductor layer on the first compound semiconductor layer, the second compound semiconductor layer being made of a compound with etch properties different from those of a compound for the first compound semiconductor layer;c) forming an etching mask on the second compound semiconductor layer, the etching mask having a first opening;d) anisotropically dry-etching the second compound semiconductor layer selectively with respect to the first compound semiconductor layer through the etching mask, thereby forming a second opening in the second compound semiconductor layer; ande) isotropically dry-etching the second compound semiconductor layer selectively with respect to the first compound semiconductor layer through the etching mask, thereby side-etching a side of the second opening and making the second opening greater in size than the first opening, wherein the steps d) and e) are performed by using an etching system which includes a reaction chamber and a substrate-side electrode provided in the reaction chamber,wherein in the steps d) and e), the substrate is mounted on the substrate-side electrode,wherein in the step d), radio frequency power is applied to the substrate-side electrode, andwherein in the step e), radio frequency power is not applied to the substrate-side electrode.