CNRS Internship – Photothermal spectroscopy to evaluate non-radiative losses in perovskite semiconductors for photovoltaics


Function: Master student

Contract Type: Internship

Starting Date: March 2022

Working Place: Palaiseau, France (Paris-Saclay technology cluster)

Duration: 6 months

Education: Master 2




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, TotalEnergies, Air Liquide, Horiba and Riber) and world-renowned academic research organizations (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 (6 programs divided in 24 work packages): from tandem solar cell technologies to economy & market assessment, state-of-the art characterization, photocatalysis and breakthrough concepts.
• State-of-the-art technological platform (8,000m²): more than 100 cutting-edge equipments worth €30M, located in cleanrooms (advanced characterization, materials deposition, prototypes for fabrication, modelling…).
• High-standard Education program (M.S. and PhD students).





The characterization team of IPVF develops advanced characterization tools to study light absorbing semiconductors in photovoltaic. Among the most widely used, photoluminescence (PL) spectroscopy and microscopy allow to evaluate the emission efficiency (i.e. radiative) of the material or the lifetime of the charge carriers (electrons, holes).

In this internship, we propose to complete these methods with measurements of the non-radiative losses of the material that generate excess heat in the semiconductor. The intern will be in charge of setting up a photothermal detection experiment of this heat via an acoustic detection (as in a microphone) based on piezoelectrics. We will then be able to measure the intensity of these non-radiative losses as a function of the energy of the photons with which we illuminate the samples, which will allow us to better understand the energy levels associated with the losses and in particular via the levels of traps located in the spectral range of the band gap of the semiconductor and which prevent the carriers from being extracted from the material. This method will be applied to the new hybrid perovskite materials which are promising for the realization of high efficiency thin film photovoltaic cells.





  • Physics
  • Material sciences


  • Strong experimental and analysis skills


Self-management skills

  • Strong teamwork skills
  • Proactive and Autonomous




Cover letter, CV and last academic transcripts to be sent to:

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