Signal development for saturated ultrafast sensors with impact ionization gain

A closed-form approximate expression is presented for the short time-frame development of silicon diode sensor signals in the context of high frame-rate detection of incident X-ray fluxes, in the limit that the X-ray absorption profile generates a longitudinally-uniform distribution of electron-hole...

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Bibliographic Details
Published in:Journal of instrumentation 2020-03, Vol.15 (3), p.P03006-P03006
Main Author: Schumm, B.A.
Format: Article
Language:English
Subjects:
Fluxes
Holes (electron deficiencies)
Instruments & Instrumentation
Ionization
PIN diodes
Sensors
Silicon diodes
X ray absorption
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Summary:A closed-form approximate expression is presented for the short time-frame development of silicon diode sensor signals in the context of high frame-rate detection of incident X-ray fluxes, in the limit that the X-ray absorption profile generates a longitudinally-uniform distribution of electron-hole pairs in the detector bulk. The expression represents the immediate time development of signals from diode sensors both with (LGAD) and without (PIN) gain, and presents a temporal scale associated with the onset of gain. Principles limiting the detection frame rate in the presence of electronic readout noise are discussed. Making use of an elemental simulation, the relative advantage of LGAD vs. PIN diode sensors is explored as a function of the effective electronic collection time. It is found that for an idealized LGAD sensor with a gain of 30, the gain provided by impact ionization yields an advantage relative to PIN diode sensors for frame rates as high as 10 GHz.
ISSN:1748-0221
1748-0221
DOI:10.1088/1748-0221/15/03/P03006