STAGE – IPVF – Advanced Characterization of Multijunction Devices: Impedance Spectroscopy measu[...]

L’institut Photovoltaïque D’île-De-France (IPVF); Gif-sur-Yvette; Sur place; EUR 40 000 - 60 000; Temps partiel

Résumé du poste

A leading solar technology research institute in Gif-sur-Yvette is looking for an Intern to focus on the advanced characterization of perovskite solar cells using impedance spectroscopy. This 6-month internship requires an M2 level in engineering related to optics or material science. You will adapt and model the impedance spectroscopy setup for tandem devices, contributing significantly to research aimed at improving solar cell efficiency. Ideal candidates will have skills in instrumentation and data processing, and knowledge in impedance spectroscopy is a plus.

Qualifications

• Required M2 level in relevant engineering fields.
• Familiarity with modeling tools like Matlab and Python.
• Experience with data processing techniques.

Responsabilités

• Adapt the IS setup at IPVF for tandem devices.
• Model the IS in tandem devices and interpret the data.

Connaissances

Instrumentation

Modeling (Matlab, Python)

Data processing

Knowledge in impedance spectroscopy

Formation

M2, Engineering school in optics, material science, physical science

Description du poste

INTERNSHIP – IPVF – Advanced Characterization of Multijunction Devices: Impedance Spectroscopy measurements and modeling

Function: Intern (M/F)

Contract: Internship agreement

Starting date: As of February 2, 2026 (to be defined)

Duration: 6 months

Education: M2, Engineering school in optics, material science, physical science

Ref.: PR-CM-2-ST

IPVF – Photovoltaic Institute of Île-de-France

IPVF is a scientific and technical pole dedicated to the research and development of solar technologies. It permanently hosts its own staff, as well as the employees of its partners and external companies. IPVF aims to become one of the world's leading centers for research, innovation, and training in the field of energy transition.

IPVF’s primary objective is to improve the performance and competitiveness of photovoltaic cells and develop breakthrough technologies by relying on four levers:

• Ambitious research program.
• The hosting of more than 200 researchers and their laboratories on its Paris-Saclay site.
• A state-of-the-art technology platform (8,000 m²) open to the photovoltaic industry actors, with more than 100 state-of-the-art equipment units located in clean rooms.
• A training program mainly based on a master's degree, the supervision of PhD students, and continuing education.

Brief history:

The IPVF was founded in 2013 on the initiative of the French government, EDF, TotalEnergies, Air Liquide, CNRS, Ecole Polytechnique, Horiba and Riber. Bringing together more than 150 researchers, our 8,000 square meter Paris-Saclay platform is a unique platform for all types of deeptech research and innovation.

• World leader in photovoltaic-related R&D by federating the best French teams in the field, in partnership with major international institutes.
• Leader in the development of photovoltaic technology bricks in line with market trends.
• Reference in sending the most promising R&D concepts to the industry.

INTERNSHIP CONTEXT

Perovskite solar cells have been disrupted in the PV world achieving high efficiencies in a short span of time. The combination of the perovskite cells on top of the silicon wafers allows the formation of perovskite‑silicon tandem solar cells which are promising candidates to surpass Shockley‑Queisser single‑junction efficiency limitation. However, stability remains the Achilles heel of perovskite solar devices. One of the most detrimental degradation mechanisms is linked to ion migration. Deeper understanding of the various degradation mechanisms, especially the locations within the device where they occur, and how ions affect perovskite performance is necessary. In this context, the characterization and modeling of perovskite solar cells, including ion migration and degradation mechanisms, is a crucial tool to significantly contribute to research efforts to improve cell efficiency and device stability.

Impedance spectroscopy (IS) is a powerful technique to study the different electronic recombination and ionic‑electronic dynamics within perovskite‑based devices and shed light on the mechanisms occurring. Recently, we have successfully interpreted IS data by using numerical drift‑diffusion (DD) simulations. In‑situ IS during degradation tests was also implemented at IPVF during Juan Pablo Flechas Medina’s PhD. In this work, we would like to go one step further and implement IS in perovskite‑based tandem devices. The IS signal of perovskite‑based tandems is much more complex than that of single junction perovskite devices, with overlapping signals complicating the physical interpretation. Last year, the first all‑perovskite tandem device was measured by IS from Stranks group. In Geeps, there is already a huge experience on IS measurement in tandem thanks to the PhD thesis of Cyril Léon. The idea is to extend this work to the measurement of perovskite‑based tandem devices.

MAIN MISSIONS

In this work, there will be two main parts:

• Adapt the IS setup at IPVF to its application on tandem devices by using selective excitation spectrum. In Geeps, admittance spectroscopy measurements can be done.
• Model the IS in tandem devices to interpret the IS data. Samples will be obtained at IPVF and from international partner labs from EU projects. This work will help characterize and discover metastability on the fabricated perovskite solar cells and tandems.

PROFILE

Skills

• Instrumentation
• Modeling (Matlab, Python)
• Data processing
• Knowledge in impedance spectroscopy is a plus

Feel free to contact us for more information about our offers.