Synthèse par évaporation thermique de couches minces de pérovskites sans plomb pour les cellules solaires tandem pérovskites/silicium

Abstract

In the current energy and climate context, the use of solar energy for the photovoltaic industry is a viable and sustainable solution. However, most commercialized solar cells suffer from great losses in efficiency due to theoretical limits. One of the most studied solutions today are perovskite/silicon tandem solar cells. Although they’ve proven to have high efficiency, perovskites thin films suffer from instability when exposed to ambient conditions or to light. Also, they have a significant amount of highly soluble lead complexes, which greatly hinder their commercialization. In this work, we propose the use of thermal evaporation as a method for synthesizing stable AgxBiyIx+3y thin films. This method enables to precisely control the thickness, the crystallinity, the absorption, the energy bands, the morphology and mobility of the synthesized layers. We’ve also proven that depending on the evaporation mode, silver bismuth iodide films are stable during annealing in ambient conditions. Hence, this work opens the door to manufacturing stable lead-free perovskite thin film, which constitutes the first step towards stable lead-free perovskite/silicon tandem cells.

Date	8 Feb 2022
Original language	French
Awarding Institution	École de technologie supérieure
Supervisor	Ricardo Izquierdo (Supervisor)