Method for the manufacture of a light emitting diode
First Claim
1. Method for manufacturing a light emitting diode with the following process steps:
- preparing a substrate;
producing on the substrate a series of layers which include a pn junction that generates light radiation;
depositing contact layers on an outer surface of the series of layers including the pn junction that generates the radiation and on a rear side of the substrate;
tempering the contact layers; and
wherein the outer surface of the layers including the pn junction that generates the light radiation is fine-frosted, whereby the luminous intensity of the light-emitting diode is increased, before deposition of the contact layers.
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Accused Products
Abstract
A method for manufacturing a light emitting diode with the following process steps. Preparation of a substrate; production on the substrate of a series of layers which include the pn junction, that generates the radiation; production of contact layers on the surface of the layers including the pn junction and generating the radiation, and on the rear side of the substrate; and tempering of the contact layers. The method is characterized by the surface of the layers including the pn junction and generating the radiation being frosted or roughened before the contact layers are deposited. Through frosting the front side, it is possible to increase the luminous efficiency of the diodes by about 25%. Since the frost-etching process is performed before the contact layers are produced, this method can be used when aluminum is to be used as the contact material. Since the frosting is restricted to the front side of the diodes and the electrically active pn junction emerges to the surface at the lateral areas, the life of the diodes is not adversely affected by the method.
14 Citations
13 Claims
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1. Method for manufacturing a light emitting diode with the following process steps:
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preparing a substrate;
producing on the substrate a series of layers which include a pn junction that generates light radiation;
depositing contact layers on an outer surface of the series of layers including the pn junction that generates the radiation and on a rear side of the substrate;
tempering the contact layers; and
wherein the outer surface of the layers including the pn junction that generates the light radiation is fine-frosted, whereby the luminous intensity of the light-emitting diode is increased, before deposition of the contact layers. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method of manufacturing a light emitting diode including the following steps in sequence:
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providing a semiconductor substrate;
forming a series of semiconductor layers including a pn junction which generates light radiation on a front surface of the substrate;
fine-frosting an outer surface of the series of layers, whereby the luminous intensity of the light emitting diode will be increased;
forming a first ohmic contact layer on the fine-frosted outer surface of the series of layers, and a second contact layer on a rear surface of the substrate; and
, tempering the first and second contact layers.- View Dependent Claims (9, 10, 11, 12, 13)
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Specification