Patent ID: 9257589
Filing Date: 2016-02-09
CPC Classification: H01L

Claim Text:
1. A single photon avalanche diode (SPAD), comprising: a first semiconductor layer of a first conductivity type; a second semiconductor layer of a second conductivity type implanted under the first semiconductor layer, in which the second conductivity type is opposite to the first conductivity type; a third semiconductor layer of the second conductivity type, which surrounds the first semiconductor layer; an epitaxial layer of the second conductivity type, which is formed on a substrate, a first contact connected to the first semiconductor layer via a conducting layer of the first conductivity type; and a second contact connected to the second semiconductor layer via a conducting layer of the second conductivity type, wherein the second semiconductor layer is buried in the epitaxial layer and the second semiconductor layer is fully depleted when a bias voltage is applied between the first contact and the second contact.