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Wavelength dependence on the space charge collection in CdZnTe detectors

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6 Author(s)
Washington, Aaron L. ; Savannah River National Laboratory, Aiken, South Carolina 29808, USA ; Teague, Lucile C. ; Duff, Martine C. ; Burger, A.
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The distribution of the internal electric field in Cd1-xZnxTe (CZT) materials has significant effects on the charge collection ability. Light exposure at various wavelengths is a relatively unexplored process that alters charge collection at the anode contact. The use of multiple wavelengths can target charge carriers at various trap energies and positions throughout the crystal. The controlled illumination increases charge collection by releasing trapped electron and hole carriers in the crystal despite differences in light energy. Our study presents the results from our investigation of the effect of external illumination of CZT on the internal electric field via the Pockels effect. The space charge collection is further analyzed based on location and intensity relative to the specific wavelength of illumination.

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Journal of Applied Physics  (Volume:111 ,  Issue: 11 )