| 摘要 |
PROBLEM TO BE SOLVED: To solve the problems that, because of a wide light receiving sensitivity and the light detection in a wide range in general, it was difficult to respond to light wavelength-division multiplex optical communication, and that the contact capacitance between the electrode and a semiconductor was large to result in a poor high speed responsibility. SOLUTION: The semiconductor light receiving element comprises a buffer layer, a light absorptive layer and a window layer sequentially laminated on a substrate, a first electrode connected to the window layer, and a second electrode connected to the substrate. The window layer is formed with a plurality of layer having optical band gaps gradually increasing away from the light absorptive layer.
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