Séminaires CINaM

jeudi 30 Janvier 2020 à 14H00

CINaM - Salle Raymond Kern

Laurent Pedesseau

Institut FOTON (UMR 6082) – INSA Rennes

From unusual semiconductors at the atomic scale to potentially promising devices

The climate change and its impacts are nowadays well established and cannot be ignored [1]. The international community agrees to have a fast energy transition, which translates in developing more efficient photovoltaic cells, light emitting and photocatalytic devices.

Halide perovskites have captivated the research community over the past 7 years mainly in the photovoltaic field. These materials have first emerged as a new generation of absorber materials for high-efficiency and low-cost solar cells [2], [3]. Indeed, unusually good optoelectronic properties for materials grown at low temperatures are associated to excellent absorbing capabilities yielding highly efficient photovoltaic devices. Nowadays, halide perovskite single junction solar cells have reached power conversion efficiency (PCE) higher than 25% [3]. Moreover, halide perovskites exhibit attractive potential for others optoelectronic applications such as Lasers, Light Emitting Devices (LEDs), Photodetectors, Photocatalysis. Nevertheless, despite promising low manufacturing costs, short payback time and abundant material resources, the potential industrial use of halide perovskites is actively debated. Major potential concerns have been raised in the initial period about the presence of Pb atom which leads to toxicity issue, the long term materials and device stability and the device upscaling.

Researchers are also working on finding alternative materials such as perovskite-like structures [4], non-perovskite structures (rudorfittes [5]) or even double perovskites [6] which may tackle simultaneously these 3 issues. Additionally, recent theoretical studies based on Density Functional Theory to predict thermodynamic, electronic and optical properties will be presented.

The ab initio simulations have been performed on HPC resources of CINES and TGCC under the allocation 2019-[x2019096724] made by GENCI (Grand Equipement National de Calcul Intensif).

 

[1] B. Obama. The Irreversible Momentum of Clean Energy. Science 2017, 355 (6321), 126–129.

[2] A. Kojima, et al., Organometal Halide Perovskites as Visible-Light Sensitizers for Photovoltaic Cells. J. Am. Chem. Soc. 2009, 131, 6050−6051.

[3] Best research-cell efficiencies; https://www.nrel.gov/pv/assets/images/efficiency-chart.png (accessed Nov 3, 2019).

[4] N. K. Noel, et al., Lead-free organic-inorganic tin halide perovskites for photovoltaic applications. Energy Environ. Sci. 2014, 7 (9), 3061–3068.

[5] I. Turkevych, et al., Photovoltaic Rudorffites: Lead‐Free Silver Bismuth Halides Alternative to Hybrid Lead Halide Perovskites. ChemSusChem 2017, 10 (19), 3754–3759.

[6] G. Volonakis, G. et al., Cs2InAgCl6: A New Lead-Free Halide Double Perovskite with Direct Band Gap. J. Phys. Chem. Lett. 2017, 8 (4), 772–778.

Invitation : J.-L. Lazzari - Entrée libre