A deep UV photodetector with Metal/Diamond/Vacuum (MDV)-type structure has been developed on CsI coated polycrystalline diamond film. The device operation is based on the simultaneous collection of both photogenerated carriers by internal drift and photoelectrons emitted in the vacuum. The performance of the detectors have been analyzed by measuring the total photosignal obtained when only an anode voltage is applied. The spectral distribution of such a photosignal reflects both the photoemission and photocurrent characteristics, which are combined together. In a simple model, the principle of operation of such device has been described in terms of two capacitors connected in series, with the applied anode voltage partitioned between the diamond film and the vacuum, depending on their dielectric constant and thickness values. It will be shown that photomodulation of the diamond surface voltage is able to add the spectral characteristics of photocurrent signal to those of photoemission and to increase the device responsivity with respect to conventional detector structures.
Rossi, M.C., Spaziani, F., Conte, G., Ralchenko, V. (2005). Metal/Diamond/ Vacuum-type photodetector for ultraviolet radiation. DIAMOND AND RELATED MATERIALS, 14, 552-555 [10.1016/j.diamond.2004.12.048].
Metal/Diamond/ Vacuum-type photodetector for ultraviolet radiation
ROSSI, Maria Cristina;CONTE, Gennaro;
2005-01-01
Abstract
A deep UV photodetector with Metal/Diamond/Vacuum (MDV)-type structure has been developed on CsI coated polycrystalline diamond film. The device operation is based on the simultaneous collection of both photogenerated carriers by internal drift and photoelectrons emitted in the vacuum. The performance of the detectors have been analyzed by measuring the total photosignal obtained when only an anode voltage is applied. The spectral distribution of such a photosignal reflects both the photoemission and photocurrent characteristics, which are combined together. In a simple model, the principle of operation of such device has been described in terms of two capacitors connected in series, with the applied anode voltage partitioned between the diamond film and the vacuum, depending on their dielectric constant and thickness values. It will be shown that photomodulation of the diamond surface voltage is able to add the spectral characteristics of photocurrent signal to those of photoemission and to increase the device responsivity with respect to conventional detector structures.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
