Patent ID: 8673664
Filing Date: 2014-03-18
Classification: G02B,H01L

Abstract:
1. A method to manufacture a photodiode with a waveguide structure, comprising steps of: preparing a pin structure by growing, on a primary surface of a semiconductor substrate, a p-type contact layer, an i-type absorption layer, an n-type cladding layer; etching a portion of the pin structure to form a mesa stripe extending along a first direction; burying the mesa stripe by a waveguide region including a lower cladding region, a core region, and an upper cladding region selectively grown on the primary surface of the substrate exposed by the etching, the lower cladding region abutting against a side of the p-type contact layer, the core region abutting against a side of the i-type absorption layer, the upper cladding region abutting against a side of the n-type cladding layer; etching a portion of the lower cladding region, the core region, and the upper cladding region concurrently with an etching of the i-type absorption layer, and the n-type cladding layer by the p-type contact layer as an etching stopper layer to form a waveguide mesa in the waveguide region and an active mesa in the pin structure, the waveguide mesa extending along a second direction substantially in perpendicular to the first direction, the active mesa including the p-type contact layer, the i-type absorption layer, and the n-type cladding layer; and forming an electrode on the active mesa and another electrode on the p-type contact layer, wherein the p-type contact layer contains aluminum (Al).