EXPERIMENTAL STUDY OF THE CURRENT NOISE SPECTRAL DENSITY VERSUS DARK CURRENT IN CdTe: Cl AND CdZnTe DETECTORS

Asaad, I.; Orsal, B.; Alabédra, R.; Arques, M.; Montémont, G.; Vergès, Loïck

doi:10.1142/9789812811165_0076

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“…The 1/f noise is dominant in a low frequency range. The noise properties of CdTe crystals were only rarely reported [3][4][5][6][7][8]. The studies found that 1/f noise dominates at low frequencies [4] and some studies show that 1/f noise dominates over 105 Hz [5].…”

Section: Introductionmentioning

confidence: 99%

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Investigation of excess 1/fnoise in CdTe single crystals

Andreev

Grmela

Moravec

et al. 2010

Semicond. Sci. Technol.

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Experimental studies of noise characteristics of CdTe crystals, prepared using the travelling heater method, have been carried out. Three types of basic material were used: low-ohmic n-type with n = 5 × 10 15 cm −3 , semi-insulating n-type with n = 1.5 × 10 9 cm −3 and low-ohmic p-type with holes concentration p = 7 × 10 14 cm −3 . The noise measurements show that the dominant noise is 1/f n noise with parameter n in range from 0.9 to 1.5 and often very close to 1. The experimental value of 1/f noise is always much higher than the theoretical value which corresponds to the total value of free carriers in the sample. The voltage noise spectral density of 1/f noise depends on the quantity of free carriers in the sample. Free carriers are distributed uniformly throughout the homogenous part of the sample. But within the depleted region there is very low concentration of free carriers which increases exponentially in the direction from the contact area to the homogenous part of the sample. Analysis shows that the excess 1/f noise is caused by the low carrier concentration within the depleted region at the metal-semiconductor junction.

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Section: Introductionmentioning

confidence: 99%

“…The noise properties of CdTe crystals were only rarely reported [3][4][5][6][7][8]. The studies found that 1/f noise dominates at low frequencies [4] and some studies show that 1/f noise dominates over 105 Hz [5]. This paper investigates the sources of excess 1/f noise in CdTe crystals.…”

Section: Introductionmentioning

confidence: 99%