Polycrystalline diamond UV-triggered MESFET receivers

Abstract

Optically triggered UV sensitive receivers were fabricated on polycrystalline diamond as surface channel MESFETs. Opaque gates with asymmetric structure were designed in order to improve charge photogeneration mainly within the gate-drain region. Photogenerated holes contributed to the channel charge by assistance of the local electric field, in such a way improving the current signal at the drain contact. The sensitivity to UV light is demonstrated by using 3 ns wide laser pulses at 193 nm, well over the diamond bandgap. The receiver transient response to such laser pulses shows that the photogeneration process is only limited by the pulse rise time and charge collection at the drain contact completed in a time scale of a few nanoseconds. Such opaque gate three-terminal devices are suitable for application in emerging photonic technologies, for power-management system optical receivers, where copper wires and EM shielding can be replaced by lightweight optical fibers.

Impact of Laser Wavelength on the Optical and Electronic Properties of Black Diamond

“…Just to mention a few of them, diamond detectors for ionizing radiation and particles represent a well‐established technology in the world of experimental high‐energy physics, due to extremely high resistance to radiation damage. Moreover, diamond‐based electronic devices show outstanding performance for high‐power and high‐frequency applications, due to the high breakdown field, the low dielectric constant, and the high carrier mobility . Finally, the possibility of achieving negative electron affinity (NEA) by surface hydrogenation makes diamond unique among the materials suitable for the fabrication of efficient thermionic converters …”

A diamond gammavoltaic cell utilizing surface conductivity and its response to different photon interaction mechanisms

“…Comparison must also be drawn to work by Conte et al [68], in which MESFETS based on hydrogen-terminated diamond were triggered by UV pulses, which turned the devices on via photogenerated holes. By this comparison, our DGV can be considered a "Comptonenhanced" device, much as these MESFETs were "UV-triggered".…”

A Highly Versatile X-ray and Electron Beam Diamond Dosimeter for Radiation Therapy and Protection

“…High-quality “electronic-grade” diamond samples with an impurity concentration three orders of magnitude lower than natural diamond are now available at a relatively low cost, thanks to the optimization of the chemical vapor deposition (CVD) technique. Dosimeters based on CVD diamond are, indeed, widely used for EBRT [ 14 , 15 , 16 , 17 , 18 ] and IORT [ 19 , 20 , 21 ], as well as for soft X-rays [ 22 , 23 , 24 ], UV light [ 25 , 26 ], charged particles [ 27 , 28 , 29 ], and neutrons [ 30 , 31 , 32 ].…”