Accession Number : AD0289009

Title :   SOLID STATE CHARGED PARTICLE SILICON DETECTORS

Corporate Author : RCA VICTOR CO LTD MONTREAL (QUEBEC)

Personal Author(s) : HALLAM,J.W. ; WILLIAMS,R.L.

Report Date : AUG 1962

Pagination or Media Count : 1

Abstract : Research concerns the Li ion drift method of making wide depletion layer solid state nuclear particle detectors. Li ions, drifting in the field of a reverse biased Si diode at temperatures in the 100 to 140 C range, compensate to a high degree the original impurities of a pellet. With a suitably drifted unit, a voltage of 100 v or less will extend the depletion layer completely across a compensated region a few mm deep. Li atoms were diffused through a surface which had been diffused previously with P. The P diffusion provides a high conductivity surface layer necessary for the formation of good electrical diodes. As a high surface concentration of Li atoms is not required, only sufficient quantities need be diffused into the Si pellet as are required for compensation of original impurities. Al alloy layers were used for contacting to the back of the wafer. This contact was found not to give rise to excessive currents when the depletion layer is extended to the back of the pellet. If Li ions are accumulated in this alloy layer the diode current rises excessively. The excess of Li ions can be removed by changing the polarity of the drifting current which drifts the excess back into the pellet. Spectra taken using Cs-137 beta and gamma rays are presented along with a Po spectrum. (Author)

Descriptors :   *ALPHA COUNTERS, *BETA COUNTERS, *ELECTRON COUNTERS, *GAMMA COUNTERS, *PROTON COUNTERS, *RADIATION MEASURING INSTRUMENTS, *SILICON, *SOLID STATE PHYSICS, DIODES, ENCAPSULATION, IONIZATION, LITHIUM, RADIATION MEASUREMENT SYSTEMS COMPONENTS, SEMICONDUCTORS

Distribution Statement : APPROVED FOR PUBLIC RELEASE