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PhD student position in Diamond Semiconductor Physics


About This PhD Project

Project Description

Project description: The attractive material properties of diamond such as high band gap, high carrier mobilities, high thermal conductivity, high breakdown field strength, radiation hardness, etc., make it a very interesting semiconductor material. Recently, diamond has received great attention for applications in spintronics and valleytronics. This is because of the unique quantum mechanical properties of diamond, as well as the presence of defects, e.g. the N-V center, with extremely long spin coherence time.

Diamond is considered to be a unique material for future high power, high frequency, high temperature devices like high-power Schottky diodes, MESFETs etc for applications in power electronics, fast switching transistors and for spintronics. Designs and fabrication techniques different from conventional methods have to be employed to realize electronic devices based on thin film single crystalline chemical vapour deposited (SC-CVD) diamond. Diamond also has a huge potential to be used as detectors in high energy physics, detectors for UV and far UV radiation, radiation sensors for radiotherapy, neutron detectors etc.

Qualifications: We are looking for a strong candidate with a Masters degree in semiconductor physics or material physics with some experience in one or more of:

Solid state physics
Semiconductor device physics
Semiconductor material characterisation
Micro/Nano structures & technology

We also require high level of proficiency in English.

The proposed work consists of:
Fabrication and characterization of spin- and valleytronic test devices in diamond using state-of-the-art optical and electrical characterization techniques, modelling and computer simulations of devices and also material characterization of CVD diamond by various characterization techniques and improving methods for studying transport processes in diamond.

PhD positions in Sweden are usually of 4-5 years duration. The student will have the opportunity to attend courses from the graduate curriculum within the fields of Solid state physics, Semiconductor device technology, Material physics, etc. PhDs are also expected to do some teaching, in Swedish or English, approximately 20% of full time.

Rules governing PhD students are set out in the Higher Education Ordinance chapter 5, §§ 1-7 and in Uppsala University’s rules and guidelines http://regler.uu.se/?languageId=1.

Uppsala University strives to be an inclusive workplace that promotes equal opportunities and attracts qualified candidates who can contribute to the University’s excellence and diversity. We welcome applications from all sections of the community and from people of all backgrounds.

Scope of employment: 100 %

References

1. J. Isberg, J. Hammersberg, E. Johansson, T. Wikström, D.J. Twitchen, A.J. Whitehead, S.E. Coe, and G.A. Scarsbrook, High carrier mobility in single-crystal plasma-deposited diamond, Science 297, 1670 (2002).
2. J. Isberg, M. Gabrysch, J. Hammersberg, S. Majdi, K. K. Kovi and D. Twitchen, Generation, transport and detection of valley polarized electrons in diamond, Nature Materials 12, 760–764 (2013).
3. S. Majdi, M. Gabrysch, K.K. Kovi, N. Suntornwipat and J. Isberg. Low Temperature Conduction-Band Transport in Diamond, Applied Physics Letters 109, 162106 (2016).
4. N. Suntornwipat, M. Gabrysch, S. Majdi, D. J. Twitchen and J. Isberg. Magnetotransport study of valley-polarized electrons in synthetic diamond, Physical Review B 94, 035408 (2016).
5. S. Majdi, M. Gabrysch, N. Suntornwipat, F. Burmeister, R. Jansson, K. K. Kovi, A. Hallén, High-temperature deep-level transient spectroscopy system for defect studies in wide-bandgap semiconductors, Review of Scientific Instruments 90, 063903 (2019)
6. N. Suntornwipat, S. Majdi, M. Gabrysch, I. Friel, J. Isberg, "Observation of transferred-electron oscillations in diamond", Applied Physics Letters 115, 192101, 2019

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