Postdoc in Ultraviolet Vertical-Cavity Surface-Emitting Lasers

As the successful candidate you will play an essential role in the development of a new semiconductor laser with ultraviolet emission that has potential applications in water purification, medical analysis and treatment, UV curing etc. You will be given the opportunity to work in one of the world-leading groups in the area and combine device design and numerical simulations with device processing and characterization in close collaboration with other Universities who are experts on epitaxial growth.

Information about the Photonics Laboratory
The Photonics Laboratory at the Department of Microtechnology and Nanoscience (MC2), with about 30 members, conducts research in optoelectronics, ultrafast optics and fiber optical communication. Research in optoelectronics, with an emphasis on semiconductor lasers, started at Chalmers in the early 1980's. Today we have the expertise and an infrastructure that covers most parts in vertical-cavity surface-emitting laser (VCSEL) development, i.e. design and simulation, laser fabrication, and material and device characterization. Realizing VCSELs from AlGaN-materials with emission in the ultraviolet (UV) is associated with challenges such as achieving efficient electrical pumping due to the low electrical conductivity of those materials and realizing high quality mirrors in combination with good control of the resonator length. Over the past three years we have developed a new thin-film lift-off process to be able to combine AlGaN-material with high-quality mirrors based upon electrochemical etching. This have enabled us to demonstrate the world's shortest emission wavelength from an optically pumped VCSEL at 310 nm and the first thin-film flip-chip UVB LEDs using this technology. With a recent research grant from the European Research Council we are now expanding our team to push the emission wavelength even shorter and to develop the world's first electrically injected deep-UV VCSEL.

Major responsibilities
As a postdoc in our group, your major responsibility will be to develop electrically injected VCSELs from III-nitride materials emitting in the ultraviolet wavelength regime. You will be exploring different tunnel junction concepts and further develop the electrochemical etch technique to be compatible with doped laser structures. Your work will be mainly experimental with a focus on device fabrication using state-of-the-art equipment in our clean room as well as characterization of fabricated devices in our new measurement laboratory. In addition, you will have access to our in-house-developed VCSEL simulation tools for laser design and modeling. The work will be conducted in close collaboration with external partners who develop and grow the epitaxial material.

Position summary
Full-time temporary employment. The position is limited to a maximum of two years (1+1).

Qualifications
By the starting date in Oct.-Dec. 2020, you must have a PhD degree, with knowledge in III-nitride device fabrication and characterization. Hands-on experience from electrochemical etching of III-nitrides will be a strong merit, as well as implementations of tunnel junctions for blue or ultraviolet light-emitting diodes and lasers. Knowledge on device simulations or epitaxial growth of III-nitrides is also regarded as an asset. Important personal qualities are enthusiasm, ability to drive and conclude projects independently, creativity and problem-solving ability. Good cooperation and social abilities are also appreciated. Excellent communication skills in spoken and written English are necessary. 

Chalmers continuously strives to be an attractive employer. Equality and diversity are substantial foundations in all activities at Chalmers.

Our offer to you
Chalmers offers a cultivating and inspiring working environment in the dynamic city of Gothenburg. 
Read more about working at Chalmers and our benefits for employees.

Application procedure
The application should be marked with Ref 20200324 and written in English. The application should be sent electronically and be attached as pdf-files, as below:

CV: (Please name the document as: CV, Surname, Ref. number) including:
• CV, include complete list of publications
• Previous teaching and pedagogical experiences
• Two references that we can contact.

Personal letter: (Please name the document as: Personal letter, Family name, Ref. number)
1-3 pages where you:
• Introduce yourself
• Describe your previous research fields and main research results
• Describe your future goals and future research focus

Other documents:
• Attested copies of completed education, grades and other certificates.

Please use the button at the foot of the page to reach the application form. The files may be compressed (zipped).

Application deadline: 14 August, 2020

For questions, please contact:
Professor Åsa Haglund, Photonics Laboratory
E-mail: asa.haglund@chalmers.se
Phone: +46(0)31-7721592

*** Chalmers declines to consider all offers of further announcement publishing or other types of support for the recruiting process in connection with this position. *** 
   



Chalmers University of Technology conducts research and education in engineering sciences, architecture, technology-related mathematical sciences, natural and nautical sciences, working in close collaboration with industry and society. The strategy for scientific excellence focuses on our six Areas of Advance; Energy, Health Engineering, Information and Communication Technology, Materials Science, Production and Transport. The aim is to make an active contribution to a sustainable future using the basic sciences as a foundation and innovation and entrepreneurship as the central driving forces. Chalmers has around 11,000 students and 3,000 employees. New knowledge and improved technology have characterised Chalmers since its foundation in 1829, completely in accordance with the will of William Chalmers and his motto: Avancez!