Semiconductor light-receiving device
AssigneeNEC Corporation
InventorSawaki Watanabe
Life of this patent
Estimating the term…
Abstract
Disclosed is light-receiving device (1) comprising semiconductor substrate (101), a light-receiving layer arranged on semiconductor substrate (101), and filter layer (103) arranged between semiconductor substrate (101) and the light-receiving layer to absorb light other than reception light. First mesa (11) serving as the light-receiving layer is surrounded by third mesa (13) for absorbing at least light other than reception light. Consequently, even when filter layer (103) is too thin to sufficiently absorb light other than reception light, third mesa (13) absorbs the light, thereby preventing the light from reaching first mesa (11).
Claims18
A semiconductor light-receiving device, comprising:
- a semiconductor substrate;
- and
- a first conductive type semiconductor layer, a second conductive type semiconductor layer including at least a light absorption layer, a first conductive type electrode formed on the first conductive type semiconductor layer, and a second conductive type electrode formed on the second conductive type semiconductor layer, which are formed on the semiconductor substrate, and
- signal light incident from the semiconductor substrate being absorbed by the light absorption layer and converted into an electric signal,
- wherein the semiconductor light-receiving device comprises a filter layer arranged between the semiconductor substrate and the light absorption layer, and formed of a semiconductor layer having a shorter absorption edge wavelength than that of the light absorption layer,
- the second conductive type electrode is formed on a first mesa where a semiconductor layer on the filter layer is formed in a mesa structure, and
- the semiconductor light-receiving device comprises a third mesa surrounding the first mesa, disposed spaced apart from the first mesa, and absorbing disturbance light to the signal light to be received by at least the light absorption layer.
Dependencies are inferred from the claim text.