Laser Induced Transient Current Pulse Shape Formation in (CdZn)Te Detectors

Praus, Petr; Belas, E.; Bok, J.; Grill, R.; Pekárek, Jakub

doi:10.1109/tns.2015.2503600

Cited by 15 publications

(18 citation statements)

References 13 publications

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“…The positive space charge appearing in this setup could be created due to the variation of carrier density induced by slightly blocking cathode or injecting anode gold contacts. Such effect is hourly observed in Au/n-CdZnTe/Au radiation detectors [30]. Weak undulations at the waveforms are partly due to sample inhomogeneity and also caused by the adjoint electronics [30].…”

Section: B Transient Current Measurementmentioning

confidence: 88%

“…Such effect is hourly observed in Au/n-CdZnTe/Au radiation detectors [30]. Weak undulations at the waveforms are partly due to sample inhomogeneity and also caused by the adjoint electronics [30].…”

Section: B Transient Current Measurementmentioning

confidence: 88%

“…The laser-induced transient current technique (L-TCT) is a powerful tool for investigation of principal electronic properties of semi-insulating materials determining the electric field profile in semiinsulating semiconductors by analysing the current waveform (CWF) shape [26,27,[30][31][32][33]. It is common in CdZnTe radiation detectors, that the space charge is induced by blocking contacts ensuring low dark current and carrier depletion.…”

Section: Transient Currents In Case Of Inhomogeneous Space Charge Dis...mentioning

confidence: 99%

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Space-Charge-Limited Photocurrents and Transient Currents in (Cd,Zn)Te Radiation Detectors

et al. 2020

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We combined steady-state photoconductivity and laser-induced transient current measurements under above-band-gap illumination to study the space charge formation in CdZnTe. Analytical as well as numerical models describing space charge limited photocurrents were developed and an excellent agreement with measured data was obtained especially with the Drift-diffusion model. Linear rise of photocurrent at low bias was observed and ascribed to the trapping of injected holes at the region close to the cathode side. Influence of space charge formation, photoconductive gain, contribution of shallow and deep levels to photocurrent-voltage characteristics were numerically simulated. According to the measurements and calculations, recent principles used at the evaluation of detector properties, mainly the mobility-lifetime product, via the photoconductivity are critically assessed.

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Section: B Transient Current Measurementmentioning

confidence: 88%

Section: B Transient Current Measurementmentioning

confidence: 88%

Section: Transient Currents In Case Of Inhomogeneous Space Charge Dis...mentioning

confidence: 99%

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Space-Charge-Limited Photocurrents and Transient Currents in (Cd,Zn)Te Radiation Detectors

et al. 2020

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“…Photo-generated electrons created near the cathode drift toward the anode and induce transient current whilst holes are immediately collected at the cathode and their effect may be neglected. The signal was amplified and recorded by a digital sampling oscilloscope at the frequency bandwidth 3 GHz [13]. Laser and bias pulses are time-correlated according the scheme outlined in Fig.…”

Section: Methodsmentioning

confidence: 99%

Space charge formation in chromium compensated GaAs radiation detectors

Belas¹,

Grill²,

Pipek³

et al. 2020

J. Phys. D: Appl. Phys.

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Space charge formation in chromium-compensated GaAs sensors is investigated by the laserinduced transient current technique applying pulsed and DC bias. Formation of non-standard space charge manifested by an appearance of both negatively and positively charged regions in DC biased sensors was revealed during 5 ms after switching bias. Using Monte Carlo simulations of current transients we determined enhanced electron lifetime τ = 150 ns and electron drift mobility μd = 3650 cm 2 /Vs. We developed and successfully applied theoretical model based on fast hole trapping in the system with spatially variable hole conductivity.

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“…Convenient methods to study the charge dynamics including the polarization phenomena in biased detectors are the transient charge technique (TChT) [ 14 ], transient current technique (TCT) [ 15 ], and laser-induced transient current technique (L-TCT) [ 16 , 17 , 18 , 19 ]. Among these, the L-TCT excited with the above-bandgap laser pulses has several advantages.…”

Section: Introductionmentioning

confidence: 99%

In and Al Schottky Contacts Comparison on P-Type Chlorine-Doped CdTe

Vasylchenko

Grill

Betušiak

et al. 2021

Sensors

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The performance of the CdTe radiation detectors heavily relies on the method of contact preparation. A convenient research method addressing this problem is the laser-induced transient current technique. In this paper, we compare the performance of two CdTe crystals which underwent different metallization processes. We showed that appropriately designed Au/Al contacts induce much less bulk polarization than commercial Pt/In electrodes under the same working conditions and can thus provide a convenient alternative to the industry standard. The comparison was based on the monitoring of the time-dependent sensor polarization measuring transient currents excited by above-bandgap laser illumination complemented by the Am 241 gamma spectroscopy. The theoretical analysis of current waveforms and radiation spectra enabled us to determine the charge carrier mobility, mobility-lifetime products of electrons and holes, and temporal and bias dependence of the space charge formation.

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Laser Induced Transient Current Pulse Shape Formation in (CdZn)Te Detectors

Cited by 15 publications

References 13 publications

Space-Charge-Limited Photocurrents and Transient Currents in (Cd,Zn)Te Radiation Detectors

Space-Charge-Limited Photocurrents and Transient Currents in (Cd,Zn)Te Radiation Detectors

Space charge formation in chromium compensated GaAs radiation detectors

In and Al Schottky Contacts Comparison on P-Type Chlorine-Doped CdTe

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