IPVF Post-doc: Development of High-Efficiency CIGS/Silicon Tandem Solar Cells

Contract type: Fixed term

Starting date: September, 2020

Duration: 36 months

Working Place: Palaiseau

Education: PhD in materials science (or other relevant field)

Salary: Salary grid

IPVF in brief

Become an actor of the Energy Transition by joining a team driven by innovation and impact to address today’s most decisive challenges.

IPVF – Institut Photovoltaïque d’Île-de-France, is a global Research, Innovation and Education center, which mission is to accelerate energy transition through science & technology.

Gathering industrial PV leaders (EDF, Total, Air Liquide, Horiba and Riber) and world-renowned academic research teams (CNRS, Ecole Polytechnique), multi-disciplinary and international IPVF teams conduct research for clean energy technologies.

Supported by the French State, IPVF is labelled Institute for Energy Transition (ITE).

IPVF at a glance:

  • An ambitious Scientific and Technological Program: from tandem solar cell technologies to economy & market assessment, state-of-the art characterization, photocatalysis and concepts breakthrough.
  • A state-of-the-art technological platform: more than 100 tools, located in cleanrooms (advanced characterization, materials deposition, prototypes for fabrication, modelling…).
  • A high-standard Education program (M.S. and PhD students).

Job context

As part of its Program VI (proof of concepts for PV innovation breakthrough), IPVF is studying the construction of tandem cells combining a silicon back cell and a CIGS front cell. This innovative approach has the advantage of combining two established technologies, silicon technology and thin film technology, currently used in their monojunction form.

The chosen approach is to directly develop the CIGS cell on top of the silicon one, also serving as a growth substrate. The goal is to achieve tandem cells with more than 30% efficiency. For this it is necessary that the two cells have a yield of around 20% monojunction.

IPVF Research Program Involved: https://ipvf.fr/jean-francois-guillemoles-and-nathanaelle-schneider-introducing-programme-6-proof-of-concept-for-pv-innovation-breakthrough/

Main missions

The candidate will directly report to the Deputy Programs Director of IPVF.

She/he will integrate a dynamic and talented team driven by innovation and results.

The CIGS cells are deposited in one or several stages by coevaporation or annealing of metal layers previously deposited under a sulfur or selenium atmosphere. The silicon substrate is functionalized to optimize the growth of CIGS epitaxially (which increases the optoelectronic quality) and to allow ohmic electrical contact during tandem operation. Tandem devices will be elaborated with operating silicon bottom cells from mainstream technologies completed by inserting a tunnel junction. The forecasted device structure will be p+ contact/p type Si/ n type Si/ tunnel junction n+p+/ P type CIGS/n type buffer layer/ n type ZnO.

An in-depth study of the properties of materials, interfaces and devices will aim at understanding and optimizing photovoltaic performances.

Program’s partner labs: https://www.cnrs-imn.fr/index.php/en/scientific-groups/inorganic-materials-for-optics-photovoltaic-and-storage-miops-group

Expected profile


  • Physics of semiconductors.
  • Materials Science.


  • Elaboration of thin films by vacuum processes.
  • Experience in photovoltaics or optoelectronics.
  • Proficiency in CIGS will be an asset.

Self-management skills

  • Curious and entreprising.
  • Autonomous and rigorous.
  • Organizational and collaborative skills.
  • Demonstrate initiative and ability to integrate a research group.
  • Results-oriented.


Cover letter and CV to be sent to : daniel.lincot@cnrs.fr
Specify the title of the offer in the subject line of the email

Need a direct line?

Feel free to contact us for more information about our offers.

  • +33(0)1 69 86 58 60
  • contact@ipvf.fr