Starved source diffusion for avalanche photodiode

a photodiode and starved source technology, applied in the field of optical communication, can solve the problem of reducing the responsivity of the edge, and achieve the effect of reducing the edge gain, and improving the reliability of the method
US20060081874A1Inactive Publication Date: 2006-04-20II VI DELAWARE INC
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Patent Information

Authority / Receiving Office
US Β· United States
Patent Type
Applications(United States)
Current Assignee / Owner
II VI DELAWARE INC
Publication Date
2006-04-20
Estimated Expiration
Not applicable Β· inactive patent

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Abstract

Starved source diffusion methods for forming avalanche photodiodes (APDs) are provided for controlling the edge effect. The edge effect is controlled by reducing edge gain near the edges of an APD active region. This is accomplished by creating a sloped diffusion front near the edges of the active region. The sloped diffusion front is advantageously formed in a single doping step by using a patterned mask during doping. The patterned mask reduces the depth to which dopants diffuse in areas where it only partly covers the underlying layer. By covering more of the underlying layer nearer the edge and progressively less towards the center, the sloped diffusion front is formed. The shallower diffusion depth near the edge reduces the edge gain, and therefore the edge effect. As a result, an APD to fiber misalignment is less likely, and possibility of edge breakdown is greatly reduced.
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Description

BACKGROUND OF THE INVENTION

[0001] 1. The Field of the Invention

[0002] The present invention relates to the field of optical communications. More particularly, the present invention relates to the field of avalanche photodiodes.

[0003] 2. The Relevant Technology

[0004] Computer and data communications networks continue to develop and expand due to declining costs, improved performance of computer and networking equipment, the remarkable growth of the internet, and the resulting increased demand for communication bandwidth. Such increased demand occurs within and between metropolitan areas as well as within communications networks. Moreover, as organizations have recognized the economic benefits of using communications networks, network applications such as electronic mail, voice and data transfer, host access, and shared and distributed databases are increasingly used as a means to increase user productivity. This increased demand, together with the growing number of distributed co...

Claims

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