Title :
Charge Collecting Properties of Proton Irradiated CdTe Detectors
Author :
Fraboni, Beatrice ; Cavallini, Anna ; Castaldini, Antonio
Author_Institution :
Bologna Univ., Bologna
Abstract :
We have investigated the effects of proton irradiation on the charge collecting properties of planar CdTe detectors. The spatial distribution of the charge collection and of the electric field inside the material has been studied by photocurrent spectroscopy and surface potential analyses. The results indicate that a localized damaged layer is formed under the irradiated electrode due to the presence of a high concentration of electron traps. The induced p+-type region affects the distribution of the electric field: after irradiation the field is no longer uniform inside the detector but it rapidly decreases to zero towards the damaged layer.
Keywords :
electrodes; electron traps; photoelectron spectra; proton effects; semiconductor counters; surface potential; charge collecting properties; electron traps; irradiated electrode; p+-type region affects; photocurrent spectroscopy; planar CdTe detectors; proton irradiation; spatial distribution; surface potential analyses; Cathodes; Electrodes; Electron traps; Gamma ray detection; Gamma ray detectors; Microscopy; Photoconductivity; Protons; Radiation detectors; Spectroscopy; Charge carrier transport; electric field distribution; proton irradiation effects; room temperature detectors;
Journal_Title :
Nuclear Science, IEEE Transactions on
DOI :
10.1109/TNS.2007.903814
