Towards the development of a self-powered vacuum ultraviolet photodetector based on calcium fluoride/gold interface
At a Glance
Section titled āAt a Glanceā| Metadata | Details |
|---|---|
| Publication Date | 2023-02-06 |
| Journal | Results in Optics |
| Authors | Tomoki Kato, Marilou CadatalāRaduban, Shingo Ono |
| Institutions | Massey University, The University of Osaka |
| Citations | 2 |
Abstract
Section titled āAbstractāA calcium fluoride (CaF2) single crystal with asymmetric gold (Au) and aluminum (Al) electrodes is investigated as a photovoltaic sensor of high-energy vacuum ultraviolet (VUV) radiation. A photocurrent of at least 0.13nA is obtained at zero bias voltage, indicating that the sensor may be self-powered and can be operated without an external voltage source. The sensor is responsive only to wavelengths shorter than 130 nm, corresponding to photon energies greater than 9.5 eV. The 130-nm cutoff wavelength aligns with the transmission edge of the crystal, allowing it to screen out unwanted background UV and visible light without having to use filters. The 5.36 Ī¼s (fall time) time response of the sensor is similar to that of a commercial diamond UV sensor (5.05 Ī¼s). When operated in reverse- and forward-bias with an applied bias voltage ranging from -9 V to 9 V, the sensor exhibits rectification. In reverse-bias operation, increasing then decreasing the bias voltage leads to hysteresis which is attributed to surface defects at the CaF2/Au interface. As a self-powered filterless VUV sensor with a sufficiently fast response speed, the CaF2 sensor would be attractive for applications requiring high-power VUV light sources to be monitored.
Tech Support
Section titled āTech SupportāOriginal Source
Section titled āOriginal SourceāReferences
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