Drilled, diffused radiation detector

Claim 1

A radiation detector, said detector comprising (a) a target of single crystal semiconductor material, said target having first and second major opposed substantially parallel surfaces and an outer peripheral edge area interconnecting said major surfaces and a target axis, said target axis passing through the centroid of said target substantially perpendicular to said major surfaces, the distance along said target axis between said major surfaces being the predetermined thickness of said target; (b) an array of a plurality of diodes therethrough, each said diode comprising, in combination, a high-aspect-ratio hole through the thickness dimension of said target and a semiconducting region of generally uniform cross-section substantially concentric with said hole, each said hole having apertures lying in the planes of said major surfaces, an inner hole surface interconnecting said apertures and a hole axis passing substantially through the center of each aperture, each said hole axis intersecting and forming a predetermined angle with said target axis at a predetermined distance away from said upper surface, each said region having a conductivity type opposite to that of said target and being bounded by the inner surface of said hole and a junction with the material of said target, said junction being substantially concentric with said hole and extending between said major surfaces.