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Ms Helen Springbett

Ms Helen Springbett
Room 0_033
Office Phone: +44 (0)1223 334368

Biography:

My research focuses on improving materials for blue single photon sources. The overall aim of the blue single photon source work in the Oliver group is to develop nitride quantum dot single photon sources from the early prototype stage towards a working quantum technology. On-demand photons are a necessity for applications such a quantum cryptography and quantum computing, and GaN offers the advantages of access to the blue and green spectral regions, tuneable emission, and higher operation temperatures. The wurtzite structure of GaN holds a spontaneous polarization and a large piezoelectric constant along the [0001] direction, which leads to polarity in strained c-plane quantum dot structures. This reduces the radiative recombination efficiency of devices grown along such directions via the quantum-confined Stark effect. For this reason, my work is currently focusing on structures grown along non-polar directions.

We conduct world leading research into nitride based III-V semiconductors: material quality, characterisation and device development.

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December 2017: Temperature and Bias Dependent Trap Capture Cross Section in AlGaN/GaN HEMT on 6-in Silicon With Carbon-Doped Buffer

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