Method for manufacturing nuclear radiation detector with deep diffused junction
AssigneeGeneral Electric Company
InventorRobert N. Hall
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Abstract
Germanium radiation detectors are manufactured by diffusing lithium into high purity p-type germanium. The diffusion is most readily accomplished from a lithium-lead-bismuth alloy at approximately 430.degree. C. and is monitored by a quartz half cell containing a standard composition of this alloy. Detectors having n-type cores may be constructed by converting high purity p-type germanium to n-type by a lithium diffusion and subsequently diffusing some of the lithium back out through the surface to create a deep p-n junction. Coaxial germanium detectors comprising deep p-n junctions are produced by the lithium diffusion process.
Claims15
A method for manufacturing deep junctions in germanium bodies comprising:
- forming a body of high purity p-type germanium having an initial acceptor concentration and
- diffusing lithium, from a precalculated concentration of lithium, deep into said body, in the absence of electrolytic processes within said body, to form a junction of high purity n-type germanium and high purity p-type germanium within said body.
A method for manufacturing deep junctions in a germanium body comprising:
- forming a body of high purity p-type germanium having an initial acceptor concentration and
- first diffusing lithium, from a precalculated concentration of lithium, deep into said body and
- subsequently diffusing lithium outward from the surface of said body, to form a junction of high purity p-type germanium and high purity n-type germanium deep within said body.
Dependencies are inferred from the claim text.