Epitaxial lift-off process with guided etching
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United States of America Patent
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Jan 9, 2018
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app pub date -
Feb 13, 2017
filing date -
Aug 28, 2015
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Abstract
A method for performing epitaxial lift-off allowing reuse of a III-V substrate to grow III-V devices is presented. A sample is received comprising a growth substrate with a top surface, a sacrificial layer on the top surface, and a device layer on the sacrificial layer. This substrate is supported inside a container and the container is filled with a wet etchant such that the wet etchant progressively etches away the sacrificial layer and the device layer lifts away from the growth substrate. While filling the container with the wet etchant, the sample is supported in the container such that the top surface of the growth substrate is non-parallel with an uppermost surface of the wet etchant. Performed in this manner, the lift-off process requires little individual setup of the sample, and is capable of batch processing and high throughput.
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