Skip to main content Skip to navigation

Quantum Devices Group

The Quantum Devices group at Warwick is interested in semiconductor devices fabricated using narrow bandgap III-V compound semiconductor materials. We are a rapidly growing group concerned with the practical challenges of fabricating devices in indium antimonide (InSb) and other closely related materials. InSb has already shown great promise for mid-wave infrared and ultra-high speed devices, with its extreme electrical properties also enabling the possibility of novel spin-based and ballistic devices. The Quantum Devices group is interested in realising the potential of InSb devices, both in the laboratory and in industrial manufacture.


Nanoantenna structures on a semiconductor wafer

Nano-antenna test patterns under the microscope



Our activities are currently focused on infrared optoelectronic devices, material interfaces and epitaxial growth techniques. We are aiming to improve infrared LEDs and photodetectors by using nano-antenna structures to improve optical coupling. By better understanding interfaces, good dielectric layers can be formed, reducing leakage currents. Our growth work aims to improve the quality of epitaxially grown layers, expand the range of materials available and improve compatability with silicon substrates.



Our activities involve extensive use of the School of Engineering’s 'Science City' cleanroom facility, as well as epitaxial growth and device characterisation facilities in other departments at Warwick. The Science City cleanroom is a state-of-the-art process engineering facility, featuring a wide array of fabriation tools and test equipment.



A selection of publications by group members.


Head of Lab: Professor Tim Ashley

Device array in simulation software

Infrared device array in simulation








Device array under optical microscope

Infrared device array under optical microscope








Device array in SEM

Infrared device array viewed using scanning electron microscope (SEM)








Feature Array in XPS

Composition imaging using X-ray photoelectron spectrometry (XPS)