Method for fabricating LED chip comprising reduced mask count and lift-off processing
View Patent ↗A method for fabricating a light emitting diode chip is provided. In the method, a half-tone mask process, a gray-tone mask process or a multi-tone mask process is applied and combined with a lift-off process to further reduce process steps of the light emitting diode chip. In the present invention, some components may also be simultaneously formed by an identical process to reduce the process steps of the light emitting diode chip. Consequently, the fabricating method of the light emitting diode provided in the present invention reduces the cost and time for the fabrication of the light emitting diode.
1. A method for fabricating a light emitting diode chip, comprising:
forming a semiconductor layer and a conductive layer sequentially on a substrate, wherein a first type semiconductor material layer, a light emitting material layer and a second type semiconductor material layer form the semiconductor layer;
forming a first patterned photoresist layer on the conductive layer, wherein the first patterned photoresist layer comprises a first photoresist block and a second photoresist block, and a thickness of the first photoresist block is thinner than a thickness of the second photoresist block;
removing a portion of the conductive layer and a portion of the semiconductor layer with the first patterned photoresist layer as a mask to form a semiconductor device layer and a current spreading layer;
reducing a thickness of the first patterned photoresist layer until the first photoresist block is removed completely, wherein the remaining second photoresist block exposes a portion of the semiconductor device layer and a portion of the current spreading layer;
forming an electrode material layer entirely; and
removing the remaining second photoresist block to strip the electrode material layer thereon and form a plurality of electrodes, wherein the plurality of electrodes are electrically connected with the semiconductor device layer and the current spreading layer.
2. The method for fabricating the light emitting diode chip as claimed in claim 1 , wherein the step of forming the first patterned photoresist layer comprises performing a half-tone mask process, a gray-tone mask process or a multi-tone mask process.