| 摘要 |
A semiconductor light-receiving device including (a) a semiconductor substrate, (b) a multi-layered including a first buffer layer having a first electrical conductivity and lying on the semiconductor substrate, a first clad layer having a first electrical conductivity and lying on the first buffer layer, a light-absorbing layer having a first electrical conductivity and lying on the first clad layer, a second clad layer having a second electrical conductivity and lying on the light-absorbing layer, and a second buffer layer having a second electrical conductivity and lying on the second clad layer, (c) a first electrode formed on the second buffer layer, and (d) a second electrode formed on a lower surface of the semiconductor substrate. The multi-layered structure has at least one portion which is inclined to a direction in which a light introduced into the device is directed. For instance, the multi-layered structure has opposite end portions inclined to the direction. A portion of the multi-layered structure making inclination with the direction provides the same advantageous effect as that a light-receiving area of a light-receiving layer of the multi-layered structure is effectively increased. Thus, the semiconductor light-receiving device could be readily coupled to other devices through optical fibers. In addition, there can be obtained a high coupling efficiency which is greater than 90%. Furthermore, the semiconductor light-receiving device provides a high quantum efficiency which is greater than 90%, and enables to accomplish high-speed response at a speed greater than 20 Gbps.
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