Diamond-based transistors, a milestone breakthrough!

Recently, David Moran, Professor at the James Watt School of Engineering at the University of Glasgow, led a research team in collaboration with the Royal Melbourne Institute of Technology in Australia and Princeton University in the United States to complete a study. Their research results, 'Extreme Enhancement-Mode Operation Accumulation Channel Hydrogen-Terminated Diamond FETs with Vth <−6V and High on-Current', were published in the journal Advanced Electronic Materials.

The achievement uses diamond as the basis for transistors that are off by default. This advance is crucial for ensuring the safety of devices that carry large amounts of current when turned on, and may help create a new generation of diamond transistors for high-power electronics.

Diamond has an inherently wide bandgap that enables it to handle much higher voltages than silicon before electrical breakdown, making it particularly attractive for high-power electronic applications such as power grids or electric vehicles.

'The challenge in power electronics is that a switch needs to be designed to stay firmly closed when not in use to ensure it meets safety standards, but it also has to deliver very high power when turned on,' Moran said. 'Previous state-of-the-art diamond transistors have typically been good at one at the expense of the other - the switches were good at staying closed but not so good at delivering current on demand, or vice versa. What we've been able to do is design a diamond transistor that excels at both, which is a significant advance.'

The Watt Nano Center team at the University of Glasgow used surface chemistry to improve the performance of diamond, coating it with hydrogen and then with aluminum oxide. The new diamond transistor requires 6 volts to turn on, has high current, and doubles the efficiency. When it is turned off, the resistance is extremely high, the noise is below the background, and there is almost no current leakage, which is crucial for high-power applications.

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Diamond-based transistors, a milestone breakthrough!

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