Description du poste
##### **12/11/2026**
**Function:** Internship
**Contract:** Internship agreement
**Starting date:** February 2027
**Duration:** 6 months
**Workplace:** IPVF – 18 bd Thomas Gobert, 91120 Palaiseau (France)
**Education:** M2 or Engineering school in Materials science, chemistry, physical chemistry
**Ref.:** PR-F-L-3-ST
**IPVF – Institut Photovoltaïque d’Île-de-France**
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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 **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.
**CONTEXT**
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Silicon solar cells are now close to their theoretical efficiency limit. Over the past decade, perovskite solar cells (PSCs) have emerged as a new generation of photovoltaic technology, reaching record efficiencies on par with silicon1, but their stability still lags far behind. Recombination at interfaces is a major obstacle to both efficiency and long-term stability, which makes effective passivation strategies essential2.
Passivation consists of depositing an ultra-thin layer of material or molecules directly on the perovskite to improve its surface properties. In recent years, passivation with ammonium and amidinium salts, which form a thin 2D layer in situ on the 3D absorber surface, has become widely adopted. 3D/2D heterostructures are now a leading configuration for PSCs: the 2D surface layer passivates defects in the 3D perovskite and improves both device efficiency and stability3. However, many challenges remain in building a well-controlled 3D/2D stack, such as controlling the phase purity and thickness of the 2D layer, ensuring its uniformity over large areas, and removing the excess ligand without damaging the underlying 3D perovskite.
At IPVF, we develop this type of passivation on wide-bandgap perovskites (1.68eV) deposited by slot-die coating, as a scalable technique that enables uniform deposition over large areas from liquid inks. This internship aims to optimize the slot-die deposition of the passivation layer, with a particular focus on solvents: those used to dissolve the organic salts, and those applied as a post-treatment to reorganize and recrystallize the interfacia