Radiant energy – Photocells; circuits and apparatus – Photocell controlled circuit
Reexamination Certificate
2005-05-17
2005-05-17
Luu, Thanh X. (Department: 2878)
Radiant energy
Photocells; circuits and apparatus
Photocell controlled circuit
C257S225000
Reexamination Certificate
active
06894267
ABSTRACT:
A photodiode is provided which can operate at a high rate and is suitable for optical communications. The photodiode with a pin-type configuration of an end surface incidence type includes a first photodiode unit having a first n-type blocking layer, a first light-absorbing layer constituted by an intrinsic semiconductor, and a first p-type blocking layer on a semiinsulating substrate; a second photodiode unit having layers of the same configuration formed thereon; a contact layer; a first electrode; and a second electrode, wherein the thickness of each light-absorbing layer is half that in a conventional monolayer photodiode. As a result, the maximum travel time of the carriers (electrons and holes) in each photodiode unit is reduced by half and the photodiode can operate at a rate higher than that of the conventional photodiode.
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Oki Electric Industry Co. Ltd.
Volentine Francos & Whitt PLLC
Yam Stephen
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