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Silicon p-n Junction Radiation Detectors

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4 Author(s)
Miller, G.L. ; Brookhaven Nat''l Lab., Upton, N.Y. ; Brown, W.L. ; Donovan, P.F. ; Mackintosh, I.M.

Silicon p-n junction particle detectors have been fabricated by diffusing phosphorus to various depths between 0.1 and 2.0 ?? into high resistivity p-type silicon. Various base material resistivities have been employed, ranging from 100 ?? cms to 13,000 ?? cms. Diffusions have been carried out both by the "gaseous" and the "paint-on" process. The devices produced have ranged in area from 1 mm2 to 1 cm2, with the majority of detectors having an area of ~.2 cm2. Using 5.5 mev ?? particles and a 5 ?? 5 mm device, the best line width that has been obtained Is 20 kev. It has been found that the 1 cm2 devices give line widths of ~ 50 kev. The effect of the thickness of the n layer forming the front surface of the junction has been investigated, and it has been shown that 0.1-?? diffusions give essentially "windowless" detectors. Other properties that have been examined are space charge generation of leakage current, charge collection efficiency as a function of bias and incident particle direction, and signal rise time.

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Nuclear Science, IRE Transactions on  (Volume:7 ,  Issue: 2-3 )