| 摘要 |
The invention relates to a detector element for x-radiation, which can be used in particular in a flat dynamic x-ray detector (FDXD). In the detector element, a directly converting conversion layer ( 2 ) is arranged between an electrode layer ( 2 ) and a matrix of pixel electrodes ( 4 ), there also being a photoconductive separating layer ( 3 ) between the pixel electrodes ( 4 ) and the conversion layer ( 2 ). In the unilluminated state, the separating layer ( 3 ) acts as an electrical barrier for free charge carriers of the conversion layer ( 2 ), which have been produced by x-radiation and migrate in the electric field between the electrodes ( 1, 4 ). After readout of the charge transfers in the pixel electrodes ( 4 ), the separating layer ( 3 ) can be rendered conductive by illumination with reset light from a diode arrangement ( 6 ), so that charge accumulations at its interface can flow away. The separating layer ( 3 ) can prevent perturbing dark currents, while charge accumulation can at the same time be avoided by the repeated reset phases.
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