In this paper we analyze in detail a peculiar behavior of CdTe detectors, namely the fact that in conjunction with a typical resistive electrical characteristic in which the current is proportional to the externally applied biasing voltage through an equivalent detector resistance, the detector shows a noise level well above the corresponding Johnson noise and close to the shot noise of the standing current. By using a correlation spectrum analyzer, a careful and extensive experimental analysis of the current noise behavior of CdTe detectors for X and (gamma) ray has been performed. The current noise spectra have been measured over a wide range of frequencies, from below 1Hz up to 100kHz and operating points from 0V up to 150V. In addition to a strong 1/f component, a white noise is present at the level of the shot noise of the standing current and extending in frequency for a limited range related to the carriers transit time across the detector.

Experimental analysis of current noise spectra in CdTe detectors

BERTUCCIO, GIUSEPPE;FERRARI, GIORGIO;SAMPIETRO, MARCO;
1999-01-01

Abstract

In this paper we analyze in detail a peculiar behavior of CdTe detectors, namely the fact that in conjunction with a typical resistive electrical characteristic in which the current is proportional to the externally applied biasing voltage through an equivalent detector resistance, the detector shows a noise level well above the corresponding Johnson noise and close to the shot noise of the standing current. By using a correlation spectrum analyzer, a careful and extensive experimental analysis of the current noise behavior of CdTe detectors for X and (gamma) ray has been performed. The current noise spectra have been measured over a wide range of frequencies, from below 1Hz up to 100kHz and operating points from 0V up to 150V. In addition to a strong 1/f component, a white noise is present at the level of the shot noise of the standing current and extending in frequency for a limited range related to the carriers transit time across the detector.
1999
9780819432544
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11311/665737
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