High performance hydrogen/oxygen terminated CVD single crystal diamond radiation detector
At a Glance
Section titled āAt a Glanceā| Metadata | Details |
|---|---|
| Publication Date | 2020-03-02 |
| Journal | Applied Physics Letters |
| Authors | Kai Su, Zeyang Ren, Jinfeng Zhang, Linyue Liu, Jincheng Zhang |
| Institutions | Wuhu Institute of Technology, Northwest Institute of Nuclear Technology |
| Citations | 22 |
Abstract
Section titled āAbstractāWe report the performance of a single crystal diamond radiation detector with gold films on hydrogen-terminated diamond as electrical contacts and oxygen-terminated diamond as surface isolation between electrodes. The origin-symmetric current-voltage characteristics showed excellent Ohmic contact behavior. An extremely low dark current value of 7.46 Ć 10ā13 A/mm2 was measured at an electric field of 1 V/Ī¼m. The charge collection efficiency and energy resolution of this detector were 99.01% and 1.5% for holes, and 98.6% and 1.7% for electrons under irradiation with 241Am Ī±-particles. Under 60Co Ī³-ray irradiation with a dose rate of 1.271 Gy/s, the gain factor, specific sensitivities, and signal-to-noise ratio were 49.46, 12.43 Ī¼C/GyĀ·mm3, and 1 Ć 106 at 200 V bias voltage (0.66 V/Ī¼m), respectively. A rise time of 347.4 ps of the response to a pico-second pulsed electron source was also measured. This research provides a possibility to improve the performance of the diamond radiation detector through diamond surface modification.