Patent ID: 6027953
Filing Date: 2000-02-22
Classification: H01L

Abstract:
A process for forming an X-ray imaging device, comprising:providing a wafer of P-type silicon having an upper and a lower surface;through a mask having an array of openings, bombarding the wafer with properly aligned thermal neutrons for a period of time, thereby converting to N-type all silicon located below said openings and thereby forming an array of P-type regions surrounded by N-type material;wholly within each P-type region, forming an N+ region that extends downwards from said upper surface;on the upper surface, wholly with each of said regions of N+ silicon, forming first negatively biased contacts;on the upper surface, wholly within each of the P-type regions and outside the N+ regions, forming second negatively biased contacts more positive than the first negatively biased contactson the lower surface, centrally located within each P-type region and underlying each region of N+ silicon, forming first positively biased contacts; andon the lower surface, underlying the second negatively biased contacts, forming second positively biased contacts more negative than the first positively biased contacts.