PERovkite Stability and Optoelectronic Properties Assessment at the Steady State

Informations projet

PERSOPASS

N° de convention de subvention: 893194

DOI

10.3030/893194

Projet clôturé

Date de signature de la CE 29 Avril 2020

Date de début 10 Septembre 2020

Date de fin 9 Septembre 2022

Financé au titre de

• EXCELLENT SCIENCE - Marie Skłodowska-Curie Actions

Coût total

€ 184 707,84

Contribution de l’UE

€ 184 707,84

Coordonné par

CENTRE NATIONAL DE LA RECHERCHE SCIENTIFIQUE CNRS
France

Periodic Reporting for period 1 - PERSOPASS (PERovkite Stability and Optoelectronic Properties Assessment at the Steady State)

Période du rapport: 2020-09-10 au 2022-09-09

Résumé du contexte et des objectifs généraux du projet

Halide Perovskites are an emerging material family with astonishing optoelectronic properties. They have become promising materials for high-performance solar cells, shown by the fact that they might reach the efficiencies of traditional silicon in less than 15 years of research. However, for their widespread application, two main issues remain. Firstly, they must be stable on the timescale of years and, secondly, their chemistry must be rationalized to have full control of their properties. PERSOPASS aims to tackle these issues by studying the relation between the chemistry and the optoelectronic properties of halide perovskites. This should provide novel strategies for obtaining stable and reproducible samples for long-lasting applications.
With reliable perovskite solar cell production, Europe could revolutionize the photovoltaic market by being able to produce photovoltaic panels locally. This could lead to new supply chains being created and Europe shedding its dependance on Asian partners. Knowing how to manage and stabilize the perovskites is a key element not only for research but also for industries that want to develop reliable products with low overheads.
The strategy pursued in PERSOPASS focused on studying the chemistry of the perovskites at thermodynamic equilibrium (which is by definition the most stable state point of the system). This should be reachable thanks to the self-healing properties of halide perovskites. Strategies for the recuperation of damaged perovskite solar panels have been assessed and may finally permit a long-term use of the halide perovskite technology for solar energy applications.

Travail effectué depuis le début du projet jusqu’à la fin de la période considérée dans le rapport et principaux résultats atteints jusqu’à présent

PERSOPASS investigated the thermodynamic equilibria that halide perovskites can establish. Each of them is set by a particular combination of chemical compounds that can co-exist with the perovskite (without reacting with it). PERSOPASS determined which equilibria can be established, the dynamics of their establishment, and the properties of the perovskites in the different equilibria. Various treatment to manipulate the fine chemistry of perovskites, including influencing their doping and defect density, have been investigated. The resulting materials were then studied with a variety of optical and electronic techniques. Complete phase and stability diagrams have been realized for some compositions providing insight into the degradation mechanisms taking place inside perovskites and strategies for their recovery (either by self-healing or by dedicated treatments).
The results of PERSOPASS are being evaluated for patenting by a commission involving EDF and TOTAL the main electricity and oil companies of France, which are interested in the renewable effort.
The results of PERSOPASS have been partially published (some publications are on the way) in prestigious peer-review journals and presented in multiple international conference in Europe and the United States. Some of the concepts investigated in PERSOPASS are in publications in an important French popular science magazine.

Progrès au-delà de l’état des connaissances et impact potentiel prévu (y compris l’impact socio-économique et les conséquences sociétales plus larges du projet jusqu’à présent)

The chemical knowledge obtained during PERSOPASS allowed the identification of relevant equilibria, degradation pathways and recovery process in perovskites. It also allowed defining strategies to recover damaged perovskite layers, facilitating the extension of the lifespan of perovskite layers. The methods have potential to cause a change of paradigm in terms of the production of perovskite thin film solar cells and in turn convince large industries to invest in the technology. The results of PERSOPASS could impact European industry by creating new solar cell production centers in Europe. This could offer flexibility and resilience to current Silicon supply chains which are increasingly being called into question.

Photodamaging and self-healing in perovskites.

Conceptual map of the relation between self-healing, chemical equilibrium and defect density

Stability and Phase diagram of the chemical species related to CsPbBr3, the simplest perovskite