Characterization of 980-nm aged pump laser by using electrical and optical noise

Asaad, I.; Orsal, B.; Perez, Jean Philippe; Signoret, Philippe; Alabédra, R.; Pommiès, Matthieu; Bettiati, M.

doi:10.1117/12.503709

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2006

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“…Noise measurements also make it possible to investigate deep recombination traps and determine their type (n or p) [4]. It is possible to obtain a more realistic model of the defect levels comparing the results coming from different experimental techniques [5]. In this paper, the results of CdTe single crystal investigations conducted using transient photoconductivity and noise methods are presented.…”

Section: Introductionmentioning

confidence: 99%

Photoelectrical and noise processes in CdTe crystals

Virt¹,

Bilyk²,

Popovych³

et al. 2006

Phys. Status Solidi (c)

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Two types of cadmium telluride single crystals were investigated: undoped CdTe grown by Bridgeman method and highly doped CdTe:Cl obtained by STHM. Photoconductivity properties of CdTe crystals were studied by the transient photoconductivity method. Persistent photo response due to the polarization effect was revealed in undoped samples. Noise spectra have been measured over a wide range of frequencies, from below 1 Hz up to 1 MHz, and for voltages applied the samples from 0 up to 200 V. Two type of noise dominates in the range of voltages and frequencies under investigation, namely excess 1/f noise and generation-recombination (G-R) noise. Two-phase model were applied to explain noise experimental results, which consider the presence of precipitates.

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Section: Introductionmentioning

confidence: 99%