Method for fabricating nitride-based compound semiconductor element
First Claim
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1. A method for fabricating a nitride-based compound semiconductor element, comprising the steps of:
- forming a nitride-based compound semiconductor layer on a base substrate;
forming a conductive film as an etching mask on part of the surface of the nitride-based compound semiconductor layer;
performing dry etching on the nitride-based compound semiconductor layer; and
performing wet etching on the nitride-based compound semiconductor layer by emitting electrons from the nitride-based compound semiconductor layer through the conductive film to the outside, the wet etching being performed without applying an external voltage to the conductive film and without radiating the nitride-based compound semiconductor layer with ultraviolet light,wherein in the step of performing dry etching, a damaged layer is created in the nitride-based compound semiconductor layer, andin the step of performing wet etching, the damaged layer is removed.
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Abstract
A method for fabricating a nitride semiconductor element according to the present invention comprises the steps of: forming a nitride semiconductor layer 13 on a base substrate 11; forming, on part of the upper surface of the nitride semiconductor layer 13, a conductive film 14 made of an electron emitting layer 14b and a dry etching mask layer 14a from bottom to top; performing dry etching on the nitride semiconductor layer 13; and performing wet etching on the nitride semiconductor layer 13 by emitting electrons from the nitride semiconductor layer 13 through the conductive film 14 to the outside.
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14 Claims
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1. A method for fabricating a nitride-based compound semiconductor element, comprising the steps of:
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forming a nitride-based compound semiconductor layer on a base substrate; forming a conductive film as an etching mask on part of the surface of the nitride-based compound semiconductor layer; performing dry etching on the nitride-based compound semiconductor layer; and performing wet etching on the nitride-based compound semiconductor layer by emitting electrons from the nitride-based compound semiconductor layer through the conductive film to the outside, the wet etching being performed without applying an external voltage to the conductive film and without radiating the nitride-based compound semiconductor layer with ultraviolet light, wherein in the step of performing dry etching, a damaged layer is created in the nitride-based compound semiconductor layer, and in the step of performing wet etching, the damaged layer is removed. - View Dependent Claims (3, 4, 8, 9, 10, 11, 12)
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2. A method for fabricating a nitride-based compound semiconductor element, comprising the steps of:
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forming a nitride-based compound semiconductor layer on a base substrate; forming, on part of the surface of the nitride-based compound semiconductor layer, a multilayer conductive film in which an uppermost layer is a dry etching mask layer and a layer lower than the dry etching mask layer is a layer for electron emitting; performing dry etching on the nitride-based compound semiconductor layer; removing the dry etching mask layer; and performing wet etching on the nitride-based compound semiconductor layer by emitting electrons from the nitride-based compound semiconductor layer through the layer for electron emitting to the outside, the wet etching being performed without applying an external voltage to the layer for electron emitting and without radiating the nitride-based compound semiconductor layer with ultraviolet light, wherein in the step of performing dry etching, a damaged layer is created in the nitride-based compound semiconductor layer, and in the step of performing wet etching, the damaged layer is removed. - View Dependent Claims (13)
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5. A method for fabricating a nitride-based compound semiconductor element, comprising the steps of:
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forming a nitride-based compound semiconductor layer comprising a multilayer whose uppermost layer is a n-type nitride-based compound semiconductor layer on a base substrate; forming, on part of the surface of the n-type nitride-based compound semiconductor layer, a conductive film as an electron emitting film for emitting electrons from the n-type nitride-based compound semiconductor layer to the outside; and performing wet etching on the n-type nitride-based compound semiconductor layer by emitting electrons from the n-type nitride-based compound semiconductor layer through the conductive film to the outside, the wet etching being performed without applying an external voltage to the conductive film while radiating the n-type nitride-based compound semiconductor layer with ultraviolet light, wherein the wet etching is performed on the n-type nitride-based compound semiconductor layer without performing dry etching. - View Dependent Claims (6, 7, 14)
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