CEA-INES/IPVF Postdoc: Characterization and Stability Assessment of Silicon-Perovskite Tandem Photovoltaic Devices

Contract type: Fixed term

Starting date: January, 2021

Duration: 36 months

Working Place: CEA-INES, Le Bourget-du-Lac (close to Chambery)

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

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.

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

The efficiency of the silicon technology that represents 90 % of the market comes closer and closer of its theoretical limit. In order to significantly further improve the efficiency of the PV conversion technological breakthroughs have to be proposed. One of them is the tandem technology that combines the crystalline silicon solar cells with a material which converts more efficiently the most energetic part of the solar spectrum, i. e. the blue part. This stacking of two different technologies allow to push the theoretical efficiency limit from 29 to 42%. Among the different material candidates available to fabricate the top cell of the tandem device, halogenated perovskites are particularly promising. These materials have just been recently applied to the PV conversion with a first proof of concept in 2009. Since then a massive worldwide research effort has allowed to reach in only ten years efficiencies up to 25.2 % in single junction and up to 29 % in tandem with silicon. This impressive performances have been obtained with small surface cell and now the development of upscalable processes is needed. In parallel of these developments, stability aspect should be taken into account to develop vialable technology for industrial transfer.

IPVF and CEA-INES dedicated for more than four years research efforts to the development of peroskite based solar cell resulting in a consolidated expertise in this field. For example CEA-INES has recently been able to build mini-modules showing an efficiencies higher than 20 % on 11 cm2. On its part, IPVF reached 15 % on 16 cm2. Moreover, today the CEA is the European leader in the development of heterojunction silicon with the reach of efficiency about 25 %.

Main missions

In this context, these two institutes are now mutualizing research efforts in order to develop a stable two terminals Perovskite on Silicon tandem device based on the heterojunction technology. This collaboration particularly focuses on the stability assessment (mainly under temperature, illumination, humidity, and electrical stress) of this technology. IPVF and CEA-INES open a 36 month post-doctoral position to identify degradation mechanism and optimize the architecture of the tandem to reach high stability. The post doc will be hosted at CEA INES (70 % of the time) and IPVF (30 %). He/She will be integrated in a pluri-disciplinary international dynamic team, made of 20 people.

Expected profile


  • PhD in Physics of semiconductor or Materials Sciences
  • A first experience in the perovskite based solar cell would be appreciated


  • Cleanroom environment
  • Experimental and strong analysis skills

Self-management skills

  • Rigorous
  • Team player


Cover letter and CV to be sent to : solenn.berson@cea.fr and jean.rousset@edf.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