Patent ID: 7883911

Claim:
A method for fabricating a photodiode which has a conductive film having an aperture and periodic surface irregularities that takes said aperture as center, and a semiconductor layer joined to said conductive film at a position of a bottom of said aperture, in an optical interconnection module comprising: said photodiode for receiving incident light emitted from a first medium in which light propagates to generate a first signal; a light source for generating a signal light that is irradiated into a second medium in which light propagates; and a mounting board on which said photodiode and said light source are arranged, wherein said first signal is supplied to an LSI chip, and light source generates the light in accordance with a second signal from said LSI chip, the method comprising the steps of: defining and forming said semiconductor layer such that a region for carrying out photoelectric conversion is limited to a position corresponding to the bottom of said aperture; forming said conductive film; and forming said aperture and said surface irregularities in said conductive film such that said aperture and said surface irregularities are matched to said region.