Halogenated hybrid perovskites : new semiconductors to meet the challenges of photovoltaics

Abstract

Halogenated hybrid perovskites, only marginally studied since the late 1990s, notably for their light-emitting properties, emerged spectacularly a decade ago in the context of photovoltaics. With sunlight conversion efficiencies now approaching those of silicon, these materials have opened up new potential for solar cell design.

The material's particular physical properties are at the root of this dazzling success. Fundamental studies of the material reveal that halogenated hybrid perovskites possess a set of favorable properties for photovoltaics, rarely present at the same time in other types of materials: a high absorption coefficient, low excitonic effects, a bandgap energy allowing good collection of photons coming from the Sun, good transport properties, high tolerance to defects. What's more, these physical properties can be modulated by chemical engineering, enabling perovskites to be optimized to meet the various challenges of photovoltaics, such as stability or multi-junction cells.

Biography

Emmanuelle Deleporte, a student at theÉcole normale supérieure Paris (ENS Paris) from 1986 to 1990, obtained her PhD in physics in 1992 for her work at the Laboratoire Pierre-Aigrain (LPA, formerly Laboratoire de physique de la matière condensée). After completing her thesis, she became a lecturer in the Physics Department at ENS Paris and continued her research at LPA, where she gained extensive experience in the optical properties of inorganic II-VI and III-V semiconductor heterostructures.
Emmanuelle Deleporte has been a professor at ENS Paris-Saclay (formerly ENS Cachan) since 2002, and carries out her research in the LuMIn (Light, Matter and Interfaces) Laboratory. She founded a multidisciplinary research team of physicists and chemists to study the optical properties of halogenated hybrid perovskites for optoelectronics, both in the context of photovoltaics and light emission. The main topics addressed concern nanoscale confinement effects, excitonic properties, carrier relaxation mechanisms, energy transfers between organic and inorganic parts, light-matter interaction in optical cavities containing perovskites. Since 2017, she has been director of the CNRS HPERO "Halide Perovskites" research group.