Methods for making light emitting diodes and optical elements
First Claim
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1. A method for making a light emitting diode, comprising steps of:
- providing a substrate having a first surface;
forming a first semiconductor layer, an active layer, and a second semiconductor pre-layer on the first surface;
electrically connecting a first electrode with the first semiconductor layer and a second electrode with the second semiconductor pre-layer; and
applying a patterned mask layer on a second semiconductor pre-layer surface away from the active layer, wherein the patterned mask layer comprises a plurality of linear walls aligned side by side, and a groove is defined between each adjacent linear walls to form an exposed portion of the second semiconductor pre-layer; and
etching the exposed portion of the second semiconductor pre-layer surface and removing the patterned mask layer to form a plurality of three-dimensional structures, wherein during the step of etching the exposed portion of the second semiconductor pre-layer surface, the patterned mask layer remains;
the plurality of three-dimensional structures are linear protruding structures, and a cross-section of each linear protruding structure is an arc, the step of etching the exposed portion of the second semiconductor pre-layer surface is carried out in a microwave plasma system capable of producing a reactive atmosphere, the reactive atmosphere comprises chlorine gas and argon gas, a chlorine input flow rate is lower than an argon input flow rate, and the chlorine input flow rate is in a range from about 4 standard-state cubic centimeters per minute to about 20 standard-state cubic centimeters per minute, and the argon input flow rate is in a range from about 10 standard-state cubic centimeters per minute to about 60 standard-state cubic centimeters per minute.
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Abstract
A method for making a LED comprises following steps. A substrate having a surface is provided. A first semiconductor layer, an active layer and a second semiconductor pre-layer is formed on the surface of the substrate. A first electrode and a second electrode are formed to electrically connect with the first semiconductor layer and the second semiconductor pre-layer respectively. A patterned mask layer is applied on a surface of the second semiconductor pre-layer. A number of three-dimensional nano-structures are formed on the second semiconductor pre-layer and the patterned mask layer is removed. A method for making an optical element is also provided.
8 Citations
11 Claims
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1. A method for making a light emitting diode, comprising steps of:
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providing a substrate having a first surface; forming a first semiconductor layer, an active layer, and a second semiconductor pre-layer on the first surface; electrically connecting a first electrode with the first semiconductor layer and a second electrode with the second semiconductor pre-layer; and applying a patterned mask layer on a second semiconductor pre-layer surface away from the active layer, wherein the patterned mask layer comprises a plurality of linear walls aligned side by side, and a groove is defined between each adjacent linear walls to form an exposed portion of the second semiconductor pre-layer; and etching the exposed portion of the second semiconductor pre-layer surface and removing the patterned mask layer to form a plurality of three-dimensional structures, wherein during the step of etching the exposed portion of the second semiconductor pre-layer surface, the patterned mask layer remains;
the plurality of three-dimensional structures are linear protruding structures, and a cross-section of each linear protruding structure is an arc, the step of etching the exposed portion of the second semiconductor pre-layer surface is carried out in a microwave plasma system capable of producing a reactive atmosphere, the reactive atmosphere comprises chlorine gas and argon gas, a chlorine input flow rate is lower than an argon input flow rate, and the chlorine input flow rate is in a range from about 4 standard-state cubic centimeters per minute to about 20 standard-state cubic centimeters per minute, and the argon input flow rate is in a range from about 10 standard-state cubic centimeters per minute to about 60 standard-state cubic centimeters per minute. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method for making a light emitting diode, comprising steps of:
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providing a substrate having a first surface; forming a first semiconductor layer, an active layer and a second semiconductor pre-layer on the first surface of the substrate, wherein the step of forming the first semiconductor layer comprises the sub-steps of; applying a first semiconductor pre-layer on the first surface of the substrate; and forming a plurality of second three-dimensional structures on a first semiconductor pre-layer surface of the first semiconductor pre-layer away from the substrate; electrically contacting a first electrode with the first semiconductor layer; electrically contacting a second electrode with the second semiconductor pre-layer; and applying a patterned mask layer on a second semiconductor pre-layer surface away from the active layer, wherein the patterned mask layer comprises a plurality of linear walls aligned side by side, and a groove is defined between each adjacent linear walls to form an exposed portion of the second semiconductor pre-layer surface; and etching the exposed portion of the second semiconductor pre-layer surface along a first direction and a second direction to form a plurality of three-dimensional structures and removing the patterned mask layer by dissolving the patterned mask layer in a stripping agent, wherein during the step of etching the exposed portion of the second semiconductor pre-layer surface, the patterned mask layer remains;
the first direction is perpendicular to the second semiconductor pre-layer surface, and the second direction is paralleled to the second semiconductor pre-layer surface. - View Dependent Claims (10, 11)
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Specification