Function: Master student
Contract Type: Internship
Starting Date: March/April 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).
Perovskite solar cells have irrupted in the PV world achieving high efficiencies in a small span of time. The combination of the perovskite on top of the silicon wafers allows the formation of perovskite-silicon tandem solar cells which are promising candidate to surpass Shockley Queisser single-junction efficiency limitation. This is why IPVF gathers many talents among its partners (EDF, TOTAL, CNRS, Ecole Polytechnique, Air Liquide, Horiba and Riber), and from outside, to fulfill its ambitious technological roadmap.
However, the stability is still the Achilles ankle of perovskite solar devices. One of the most detrimental degradation mechanisms is linked to ion migration . Deeper understanding on how the ions affect the perovskite performance is necessary[1-4]. In this context, the modeling of photovoltaic devices including ion migration is a crucial tool to significantly contribute to research efforts to improve PV cell efficiency and device stability. Within IPVF, several laboratories are involved in a project focused on the modeling of PV materials and devices for the development of adequate simulation tools. This work is done in a strong interaction with the characterization team.
 Detrimental effects of ion migration in the perovskite and hole transport layers on the efficiency of inverted perovskite solar cells. Y. Huang, P. López-Varo, J.B. Puel et al. Journal of Photonics for Energy 10(2):024502, 2020.
 Dynamic Phenomena at Perovskite/Electron-Selective Contact Interface as Interpreted from Photovoltage Decays. R. Gottesman, P. López-Varo et al. Chem 1(5):776-789, 2016.
 Coupled Ionic-Electronic Equivalent Circuit to Describe Asymmetric Rise and Decay of Photovoltage Profile in Perovskite Solar Cells. Ebadi, F., Aryanpour, M., Mohammadpour, R. et al. Sci Rep 9, 11962 (2019).
 Assigning ionic properties in perovskite solar cells; a unifying transient simulation/experimental study. Mathias Fischer, David Kiermasch, Lidon Gil-Escrig, Henk J. Bolink, et al. Sustainable Energy Fuels, 2021, 5, 3578–3587.
The mission will be focused on assessing ionic properties in perovskite solar cells by a combination of modelling and experimental study of open circuit voltage decay (OCVD). This technique allows to characterize the electronic and ionic conductivity and properties in perovskite solar cells[2-4]. The main mission will be to adapt a previously developed home-made code to perform OCVD. The second mission will be to extract ionic properties (ionic concentration and diffusion) by interpreting experimental OCVD. This second part will be done in close collaboration with the experimental and characterization teams.
Taking into account specific models of physico-chemical properties involved in perovskite solar cells is crucial to develop more predictive solar cell models. In addition, deep understanding of OCVD can give us access to study electrical properties (surface and bulk recombination) which will help to characterize the fabricated perovskite solar cells. This work will potentially allow the writing of a paper.
The application can include: cover letter, resume, names and contact details of 2-3 references (name, relation to candidate, e-mail and telephone number), ex of computer program developed. To be sent to: Pilar.LOPEZ-VARO@ipvf.fr
Feel free to contact us for more information about our offers.