Toby Octon

Postgraduate Researcher (Metamaterials CDT 2014)


Telephone: 01392 724059

Extension: (Streatham) 4059

I worked at Southampton University in engineering for two summer placements in 2012 & 2013. These projects were on the manufacturing of synthetic thin veins using plastics and the creation of a microfludic separator to filter micron sized particles out of water which resulted in a publication.

In 2014 I received my MPhys degree from the University of Exeter studying metamaterial arrays acting as a high frequency cut off filters for ultrasound frequencies of 1 - 15 kHz..

After this, I was accepted onto the Centre of Doctoral Training at Exeter University which started in 2014. I started the PhD looking at two dimensional semiconductors for use in optoelectronics field effect transistors in the visible and NIR. Current silicon based technologies are heavily laterally scaled and have reached their limits dictated by quantum mechanics. By using two dimensional materials the hope is that we can laterally and vertically scale future electronics to make the smallest possible transistors to create better optoelectronics for everyday use. So far we have looked at one material in particular, MoTe2 which has a band gap of 1.1 eV and seen how it performs compared to silicon optoelectronics. despite only being nanometers thick, MoTe2 shows a large photoresponsivity in a field effect transistor configuration with a response speed of ~100 microseconds. Studies into how and why the transistors perform in ambient conditions have nbeen carried out too.

Future work will involve deterministically controlling the material parameters such as layer thicknesss, as well as using encapsulation techniques to isolate the MoTe2 from the atmosphere to improve the optoelectronic properties.