IPVF Internship – Confocal time-resolved microscopy to study semiconductor absorbers 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). Down-conversion, also known as quantum cutting, is a process by which a high-energy photon is transformed into two or more lower energy photons. For photo-voltaic applications, down-conversion is used to generate multiple e-h pairs from a single incoming photon.

In this internship, we propose to develop and optimize a confocal luminescence microscopy experiment that will allow, by performing lateral scans, to map the local luminescence properties of the material. Thanks to a photon counting technique (Time-Correlated Single Photon Counting TCSPC), we will be able to measure the kinetics of photon emission to deduce the lifetime of the charge carriers in the studied material. By going a step further in the study of the emission statistics, it will also be possible to study the quantum events of emission by photonic conversion (or down-conversion) during which two photons are emitted almost simultaneously. This phenomenon is promising for photovoltaics because it allows, in certain experimental configurations, to limit the losses by phonon emission (inducing heat) usually present in solar 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: geraud.delport@cnrs.fr

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
Contact us