PhD Position: Advanced numerical modeling and characterization of doping in semiconducting devices

Fluxim logo with colorful dots and a blue circle with 'zhaw' and 'spin off' written inside.

THE COMPANY

Fluxim provides device simulation software and measurement hardware to the display, lighting and photovoltaics community. We develop and commercialize simulation tools, as well as measurement equipment for all-in-one electro-optical device characterization and for device stability assessment. Our R&D tools are used worldwide in industrial and academic research labs for device and material optimization as well as for the study of device physics. Leading manufacturers and academic institutes rely on our tools for electro-optical simulation and characterization of emerging semiconductor technology.

THE POSITION

Fluxim is seeking applicants to take part in the European Marie Skłodowska-Curie Doctoral Training Network program FADOS. The successful candidate will join a cohort of 17 students scattered among 16 research groups in Europe and the UK.

  • Program: MSCA Doctoral Network FADOS

  • Focus: drift-diffusion modeling of electronic and ionic doping in organic semiconductors; C++ implementation in Setfos

  • Host: Fluxim (Switzerland) | Enrollment: University of Heidelberg (Germany)

  • Secondments: Spain, Germany, UK

  • Start: 1 February 2026 (flexible) | Contract: 36 months | Apply by: 15 October 2025

ABOUT FADOS

FADOS, Fundamentals and Applications of Doped Organic Semiconductors, is a consortium composed of eight universities, four research institutes, and four companies from EU countries, the UK, and Switzerland. The mission of FADOS is to achieve targeted modification of semiconductor properties through electronic doping to control and modify its electronic characteristics. The project’s goal is to develop fundamental understanding and innovative fabrication processes to solve urgent problems in organic electronic devices and enable new components with sustainable functionalities. Collaboration with industry partners will enhance the translation of research into real-world applications.

The 17 Doctoral candidates recruited for this international project will receive training at the forefront of research and innovation in organic electronics. Moreover, the network will provide Doctoral candidates with exposure to academic and commercial working environments through a balanced secondment plan, and access to a complete training program complementing scientific skills with personal and entrepreneurial skills, including communication to various audiences, career development, intellectual property, and startup-funding.

The doctoral candidates will form a strong cohort through participation in seven network-wide events as well as secondments and collaborations, which entail travel to several different EU countries.

YOUR MAIN RESPONSIBILITIES

In the framework of the FADOS project, we look for a computational scientist to carry out a PhD project (physicists and chemists with experience in semiconductors and with a strong programming background are also welcome to apply). The PhD student will develop novel, generalized models of doping in semiconductors, based on the drift-diffusion framework of Fluxim’s simulation software Setfos.

The PhD project involves the following responsibilities:

· Develop, implement and test models of doping and trapping phenomena, including electronic and ionic transport processes in organic semiconductors and beyond

· Extend capabilities to simulate electro-thermal behavior in a variety of semiconducting devices

· Test and validate the developed models and simulation tools, including comparison with experimental data

· Contributing to the development of software prototypes, testing procedures, and documentation.

· Collaborating closely with international project partners from the FADOS network.

· Three international secondments (Spain, Germany, and UK) on comparing simulations of charge transport using different levels of theory and collaborating with experimental groups to validate the developed models

· Writing scientific publications and giving presentations at scientific conferences.

With the outcome of the project, the student will help guide Fluxim’s efforts in providing high-end R&D solutions to industries including photovoltaics, LED and displays, and thermoelectrics.

QUALIFICATIONS AND ELIGIBILITY

The ideal candidate has a university master’s degree in computational science, physics, or chemistry and is passionate about analytical and numerical modeling and about the development of simulation tools. Prior research experience in semiconductor physics, numerical methods, and programming in C++ is highly desirable. We are looking for a motivated scientist who enjoys working in a dynamic and international setting and who is keen on advancing the understanding and the potential of simulations in the field of (opto)electronics and semiconductors. Willingness and the ability to travel both within the Schengen region, the UK, and abroad to conduct research (including secondments) and attend conferences and network activities are a requirement. Proficiency in written/spoken English is mandatory.

ADDITIONAL ELIGIBILITY FOR FADOS PROGRAM

· At the time of recruitment, the applicant must be in the first four years of their research career and have not been awarded a doctoral degree.

· Mobility rule: the applicant must not have resided or carried out their main activity (work, studies, etc.) in Switzerland for more than 12 months in the 3 years immediately prior to the recruitment. Compulsory national service, short stays such as holidays, and time spent as part of a procedure for obtaining refugee status under the Geneva Convention are not taken into account.

· The applicant can be of any nationality.

OUR OFFER

We offer an exciting PhD position in a dynamic working environment within a highly motivated team. Besides the academic research associated with the project, this position offers the opportunity to work in an industrial environment and actively contribute to future versions of the commercial simulation software Setfos and Laoss. The position is embedded in an international project consortium with 16 other PhD candidates, offering regular scientific exchange, collaboration, and training opportunities. The PhD candidate will officially be registered at the University of Heidelberg in Germany.

Start date: 1st February 2026, with some flexibility

Duration of work contract: 36 months (probation period: 3 months)

APPLICATION

Applications including the below listed information/documents shall be sent to phd-job25@fluxim.com by the 15th October 2025.

· Certified copies of the Bachelor's and Master's degree certificates. Official translations into English (if the original documents are in a language other than English)

· Curriculum Vitae/CV.

· List of publications (if any) including a description of your contribution to the publication.

· References: Contact details of at least 2 referees included in the CV.

· Motivation letter: maximum 1 page where you introduce yourself, present your qualifications and describe why you are motivated for this specific position. Please emphasize your future goals career-wise.

· Nationality.

In case your application with us is not successful, we can offer to contact other partners in the consortium that may be interested in your profile. If you wish us to do so, please state this in your Motivation letter. For more information, please visit www.fluxim.com and contact Dr. Davide Moia (davide.moia@fluxim.com) phone +41 44 500 4770.