The response of polycrystalline diamond detectors to low-energy x-ray beams is presented. Diamond metal/semiconductor/metal vertical structures have been realized to investigate the influence of the electric field in the dark and under x-ray irradiation. Nonlinear contributions to the current, compatible with field-assisted thermal ionization of trapped charges, have been evidenced, as well as the presence of defect-related electronic states acting as traps has been confirmed by subband-gap photoconductivity measurements. Moreover, correlations have been evidenced among irradiation time, variation of the current in the dark, and photoconductive response of the devices to the x-ray beam. An evaluation of the minority-carrier mobility-lifetime product, at the end of the activation process, has led to a value of 9.210−7 cm2 /V. Two orders of magnitude linear response to the beam intensity variations have been evaluated after removal of the bremsstrahlung radiation contribution on a 43-um-thick device.
CONTE G, ROSSI M.C., SALVATORI S., ASCARELLI P., & TRUCCHI D. (2004). Thin Polycrystalline Diamond for Low Energy X-Ray Detection. JOURNAL OF APPLIED PHYSICS, 96, 6415.
Titolo: | Thin Polycrystalline Diamond for Low Energy X-Ray Detection | |
Autori: | ||
Data di pubblicazione: | 2004 | |
Rivista: | ||
Citazione: | CONTE G, ROSSI M.C., SALVATORI S., ASCARELLI P., & TRUCCHI D. (2004). Thin Polycrystalline Diamond for Low Energy X-Ray Detection. JOURNAL OF APPLIED PHYSICS, 96, 6415. | |
Abstract: | The response of polycrystalline diamond detectors to low-energy x-ray beams is presented. Diamond metal/semiconductor/metal vertical structures have been realized to investigate the influence of the electric field in the dark and under x-ray irradiation. Nonlinear contributions to the current, compatible with field-assisted thermal ionization of trapped charges, have been evidenced, as well as the presence of defect-related electronic states acting as traps has been confirmed by subband-gap photoconductivity measurements. Moreover, correlations have been evidenced among irradiation time, variation of the current in the dark, and photoconductive response of the devices to the x-ray beam. An evaluation of the minority-carrier mobility-lifetime product, at the end of the activation process, has led to a value of 9.210−7 cm2 /V. Two orders of magnitude linear response to the beam intensity variations have been evaluated after removal of the bremsstrahlung radiation contribution on a 43-um-thick device. | |
Handle: | http://hdl.handle.net/11590/149249 | |
Appare nelle tipologie: | 1.1 Articolo in rivista |