Venerdì 2 Dicembre 2022
Ore 14.30
Sala Seminari, Piano I, Edificio U5 – via Roberto Cozzi 55, Milano
Relatore: Dr. Michele de Bastiani – King Abdullah University of Science and Technology
Titolo: The new generation of multijunction solar cells: perovskite/silicon tandems
Abstract. The mainstream crystalline silicon photovoltaic technologies are approaching their practical limits. To further gain in performance, the best silicon technology can be coupled with other semiconductors to realize multijunction configurations with efficiencies beyond 30% for the residential and utility-scale market. Halide perovskites are a recent class of semiconductors with remarkable optoelectronic properties, such as steep absorption coefficient, low voltage losses, and bandgap tunability. The latter enabled the coupling with silicon heterojunctions for the realization of tandem solar cells with efficiency >31%. Unfortunately, the lack of stability of perovskites is currently the roadblock toward the commercialization of the tandem, which looks at the silicon standards of 25 years and more of warranties. In this talk, I will revise the materials, the processes, and the strategies that enabled record-efficient tandems with particular attention to the mechanisms that affect the stability of the performances, comparing lab experiments with more than a year of outdoor data.