Offres d’emploi

IPVF Post-doc: Development of a Perovskite/Silicon Two Terminal Tandem Device

Contract type: COD

Starting date: ASAP

Duration: 36 months

Working Place: IPVF – Palaiseau (Paris area) / Travel to CEA-INES (Bourget-du-Lac) expected

Education: PhD in Materials Science (or other relevant field)

Salary: Profil dependant

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.

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).


CEA-INES in brief

INES, National Institute for Solar Energy is a global leader in R&D and education for advanced photovoltaic solar technologies, their integration into electrical systems and smart energy management. Its R&D facilities are operated by CEA and integrates laboratories from the CEA and joint research units from the University of Savoie Mont Blanc & CNRS.

 With its 500 talents and with Best-in-class equipment, INES brings expertise to the industry, from proof of concept to technology transfer.

 The French Alternative Energies and Atomic Energy Commission (CEA) is a key player in research, development and innovation in four main areas:

  • defense and security,
  • low carbon energies (nuclear and renewable energies),
  • technological research for industry,
  • fundamental research in the physical sciences and life sciences.

 ​According to Reuter’s rankings, the CEA is one of the world’s most innovative public research organisation. That’s the conclusion of Reuters’ “Top 25 Global Innovators – Government”, a list that identifies and ranks publicly funded institutions.

Job context

The efficiency of the silicon technology – that represents 90 % of the market – comes closer and closer to its theoretical limit (c.a. 29%). In order to further improve the photovoltaic (PV) conversion efficiency significantly, technological breakthroughs are needed. A promising pathway towards higher efficiencies is to combine the crystalline silicon solar cells with a material that converts more efficiently the most energetic part of the solar spectrum (i.e. UV-visible region). This technology, called tandem solar cell, consists in stacking two difference systems to push the theoretical efficiency limit from 29% up to 42%.

Among the different materials available to fabricate the top cell of the tandem device, hybrid perovskites are particularly promising candidates. These materials have been recently applied to PV with a first proof of concept in 2009. Since then, a massive worldwide research effort has allowed to reach, in ten years only, efficiencies up to 25.2 % in single junction and up to 29% in tandem with silicon. These impressive performances have been obtained on small-scale surface cells and the tendency is now to develop up-scalable processes. 


IPVF and CEA-INES are dedicating strong research efforts at high-level that have resulted in a consolidated expertise in the development of perovskite-based solar cell technologies. For instance, CEA-INES has recently been able to build mini-modules showing efficiencies higher than 20% on 11 cm2. Besides, IPVF reached 15% perovskite mini-modules on 16 cm2. Finally, CEA possesses strong assets in PV as the European leader in the development of heterojunction silicon solar cells with demonstrated efficiencies up to 24.6 %.

In this context, IPVF and CEA-INES are mutualizing research efforts in order to develop a two terminals Perovskite on Silicon tandem device based on the Heterojunction technology developed at CEA-INES. This collaboration particularly focuses on the development of a two-step deposition process combining the growth of an inorganic precursor by evaporation layer followed by its transformation into Perovskite compound by a wet method.


Main missions

The candidate will directly report to the Deputy Programs Director of IPVF and will work in strong collaboration with CEA-INES lab.

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

The post doc will be hosted at IPVF (70 % of the time) and CEA – INES (30 %) and will be in charge of the exchanges between these two institutes.


The postdoctoral researcher will be in charge of:

  • Optimizing the perovskite top-cell fabrication by evaporation and wet processes.
  • Integrating the developed perovskite into a 2T tandem structure.
  • Characterizing the opto-electrical properties of the materials and devices.

Sought profile


      • Materials science and/or physics/chemistry of semiconductors.
      • Vacuum-based deposition.
      • Advanced characterization.


  • Hands-on experience with materials deposition by evaporation processes.
  • Proficiency in perovskite-based solar cell is a plus.
  • Work experience in cleanroom environment is an asset.
  • Strong analysis skills.

Self-management skills

  • Rigorous and team player.
  • Autonomous
  • Excellent organizational and collaborative skills.
  • Results-oriented.


Cover letter and CV to be sent to:, and
Specify the title and reference of the offer in the subject line of the email