Patent ID: 8394705
Filing Date: 2013-03-12
Classification: G02B,G02F,H01L

Abstract:
1. A method of manufacturing a semiconductor device, comprising: providing a semiconductor substrate having a first region where a first optical device is to be formed and a second region where a waveguide is to be formed; forming a first buried oxide layer in the semiconductor substrate in the first region so that the semiconductor substrate in the first region is divided into a lower semiconductor layer and an upper semiconductor layer, while not forming the first buried oxide layer in the semiconductor substrate in the second region; defining an active portion by forming a trench in the semiconductor substrate in the second region; forming a capping semiconductor pattern over a top surface of the active portion and over a sidewall of the active portion; exposing a lower portion of the sidewall of the active portion; oxidizing the capping semiconductor pattern and the lower portion of the sidewall of the active portion to form an oxide layer surrounding a non-oxidized portion of the active portion; and forming a first optical device disposed in the upper semiconductor layer of the first region, wherein the non-oxidized portion of the active portion is configured to be a core of the waveguide through which optical signals pass, wherein the core is coupled to the first optical device, and wherein the forming of the capping semiconductor pattern comprises: wherein the capping semiconductor pattern extends to cover a top surface of the upper semiconductor layer in the first region, and wherein a portion of the capping semiconductor pattern over the upper semiconductor layer is oxidized by an oxidizing process, so that the oxide layer is formed over the upper semiconductor layer.