Patent ID: 7148551

Claim:
A semiconductor energy detector, comprising: a semiconductor substrate comprised of a semiconductor of a first conductivity type, into which an energy ray of a predetermined wavelength range is incident from an incident surface thereof, wherein a plurality of diffusion regions of a second conductivity type comprised of a semiconductor of a second conductivity type and a diffusion region of the first conductivity type comprised of a semiconductor of the first conductivity type higher in impurity concentration than said semiconductor substrate are provided on a surface opposite to the incident surface of said semiconductor substrate; wherein a pn junction is formed at an area of interface between said semiconductor substrate and each of said diffusion regions of the second conductivity type, and each first conductivity type semiconductor substrate side of the pn junction formed at the area of interface between said semiconductor substrate and each of said diffusion regions of the second conductivity type, is commonly connected; and wherein said diffusion region of the first conductivity type has a plurality of portions surrounding each perimeter of the plurality of diffusion regions of the second conductivity type one by one, the plurality of portions being electrically connected to each other.