Intergrating a silicon photonics photodetector with CMOS devices
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United States of America Patent
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May 19, 2015
Grant Date -
Jul 3, 2014
app pub date -
Jan 2, 2013
filing date -
Jan 2, 2013
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Abstract
A method of forming an integrated photonic semiconductor structure having a photonic device and adjacent CMOS devices may include depositing a first silicon nitride layer over the adjacent CMOS devices and depositing an oxide layer over the first silicon nitride layer, wherein the oxide layer conformally covers the first silicon nitride layer and the underlying adjacent CMOS devices to form a substantially planarized surface over the adjacent CMOS devices. A second silicon nitride layer is then deposited over the oxide layer and a region corresponding to forming the photonic device. A germanium layer is deposited over the oxide layer and the region corresponding to forming the photonic device. The germanium layer deposited over the adjacent CMOS devices is etched to form a germanium active layer within the photonic region, whereby the oxide layer and the second silicon nitride layer protect the adjacent CMOS devices during the etching of the germanium.
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