Job Description

Perovskite/silicon tandem solar cells are a very promising technology to achieve >30% power conversion efficiency target. Despite this technology features promising efficiency potential, several challenges need to be overcome prior to possible industrial applications. A particular challenge relates to the fact that to maximize the light coupling into the bottom cells, the tandems require so-called random-pyramid textured bottom cells (with a feature size of several microns. Whereas flat substrates have enormous reflection losses, textured substrates enable improved light coupling into the silicon wafers.

Textured silicon solar cells are the industrial state-of-the-art, and there is likely little incentive to develop processes on expensive mirror-polished wafers. However, due to the characteristics of textured surfaces, which present irregularities and low-wetting properties, conventional solution techniques cannot be used to deposit the perovskite or the extraction layers. From this, it can be readily understood that the top cell fabrication needs to rely on scalable and conformal deposition methods, with a high degree of uniformity and reproducibility. 

For these reasons, we aim in this project to develop scalable vacuum-based techniques aiming champion perovskite/silicon tandem solar cells.

Why thermally evaporated perovskites?

  • Scalability: vacuum based deposition techniques are a well-established technique in several industrial processes.
  • Reproducibility: thermal evaporation process of perovskite absorbers is not affected by the multitude of uncontrollable parameters typical for solution-processed perovskites.
  • Uniformity: unlikely solution deposition, evaporation enables uniform deposition, independently from the substrate type.
  • Low thermal budget: thermal evaporation is a low-temperature process and the substrate can be eventually further cooled to room temperature.
  • Environmentally benign: evaporation does not involve toxic solvents.
  • Process flexibility: different perovskite composition can be obtained by evaporation, according to the desired application.


In this project, the candidate will perform thermal evaporation of perovskites constituents and finalize the conversion of the layers by solution-based methods. Later, the candidate will finalize the device and characterize the fabricated devices with world-class facilities of KPV-LAB and KSC.

At the end of the internship period, the candidate will learn how to fabricate and optimize high-efficiency perovskite/silicon tandem solar cells.

The candidate will have a chance to contribute to scientific publications.

  • USD 1000 Monthly Stipend
  • Free housing during the stay (Private Bedroom/Bathroom)
  • Visa And Airfare Fees (two-way tickets)
  • Health Insurance
  • Social And Cultural Activities
  • Access to KPV-LAB, KSC and Core laboratories, and major research and community facilities

To apply this project, please send email to Prof. Stefaan De Wolf via

In your email, please make sure that you mentioned the information below and uploaded the required documents.

  1. Which internship program do you want to apply to?
  2. Which project do you want to apply? (Please write the full name of the project)
  3. How long you would like to stay for internship?
  4. Please upload your current curriculum vitae (CV)
  5. Please upload your cover letter (briefly describing your previous experience and future research interests/plans)
  6. Please upload contact information of three references
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Job Features

  • Location:


  • Job Type:
    Visiting Student Internship (VS), Visiting Student Research Program (VSRP)
  • Education:

    BSc, BEng, and MSc in the field of Physics, Materials Science and Engineering, Electrical and Electronics Engineering, Mechanical Engineering or related.

  • Experience:

    The candidate should have basic knowledge about the physics of the solar cells