Halide Perovskites



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par abergonzoni -

Laboratory name : Laboratoire d’Electrochimie et Physicochimie des Matériaux et des Interfaces, UMR 5279

Adress : Bâtiment Hélios, 60 avenue Lac Léman, Campus Savoie Technolac 73376 Le Bourget du Lac

Contact : Emilie PLANES, Emilie.planes univ-smb.fr

Topics :

Although overwhelmingly supported by public opinion, the PV industry needs to reduce its production costs in order to be deployed on a large scale, while increasing the performance and lifetime of the devices. A large part of the studies at the global scale concerns these issues, with very different approaches. Our work has first focused on organic cells and now on perovskite solar cells, which have the potential to overcome the performance limitations of current technologies, while having low cost and high versatility. Our joint project with the CEA focuses on the development of stable and efficient 3rd generation photovoltaic devices. Different works have been carried out with main objectives : the optimization of interfaces in encapsulated photovoltaic devices, the increase of the intrinsic stability of perovskite solar cells, the development, and the study of the stability of semi-transparent perovskite cells for single junction and tandem application. Currently a study concerning the stability of tandem silicon/perovskite cells is also being conducted. More recently, our team is carrying out more fundamental work concerning the development of a new technology based on electrodeposition for the industrial development of these cells (MESR thesis grant). Since 2019, we are also interested in 2 projects, one European and the other international in collaboration with Solaronix and the Fraunhofer Institute, in a new type of perovskite cells consisting of a printed structure of porous metal oxides with a carbon counter electrode. Contrary to conventional perovskite architectures, the perovskite is formed in situ through the porous monolithic architecture and only during the final step of the process. In order to reach maximum photovoltaic performances, these devices generally require a maturation step. Our first concern is to bring some understanding on this essential step, to better control it and eventually improve it or reduce its duration in order to optimize the industrial process. A second part consists in the study and elucidation of the degradation mechanisms within these photovoltaic devices when they are subjected to various stress conditions (temperature, humidity, illumination, voltage, ...). Recently, in the framework of the UNITA project call, which aims to create collaborations in Europe, we have obtained a PhD grant with Spanish colleagues from the University of Zaragoza for the development and stability of hybrid solar cells based on perovskite and nanocrystalline additives.
Through these different projects, we have developed very strong skills in the field of performance and stability evaluation of perovskite-based PV devices. An essential part of our studies concerns the stability of these solar cells and to provide sufficient understanding, it was necessary to develop dedicated characterization tools (LBIC, PL imaging), measurement protocols and innovative reflection approaches such as the study of partial stacks in order to be able to correlate the functional properties of a solar cell and the intrinsic properties of the different layers constituting it as well as its interactions with others. Some of our activities concern solar cell manufacturing processes, but this only concerns innovative processes for industrial and large area applications.

Experimental means / theoretical tools :
J(V) measurements, PL/EL imaging, LBIC, PL spectroscopy, UV-Vis spectroscopy, impedance spectroscopy, profilometry, SEM, AFM, Raman and FTIR spectroscopies