Symposium CT02—Halide Perovskites—From Lead-Free Materials to Advanced Characterization and Deposition Approaches
In the last few years, perovskite solar cells (PSCs) have emerged as a low-cost, thin-film technology with unprecedented efficiency gains from 3.8% in 2009 to 23.3% in 2018 challenging the quasi-paradigm that high efficiency photovoltaics must come at high costs. Perovskites can be processed via inexpensive solution-methods and have exceptional material properties (comparable to expensive, high-temperature processed materials such as GaAs, Si). The perovskite band gap can be tuned from 1 to 3 eV. Therefore, perovskites are at the center stage of current semiconductor research for applications in solar cells.
This symposium will focus on the fundamental questions that make perovskites so remarkable. We will give emphasis to advanced characterization techniques that help understand halide perovskites. We will have a session on the progress of deposition techniques, which will allow for accurate control of materials properties while remaining relevant for commercialization of these materials for different applications. This symposium will also draw together the interdisciplinary scientific community working on lead-free materials. The symposium will cover the fundamental understanding of the properties of the lead-halide perovskites that enable its high photoluminescence quantum yields and long diffusion lengths to be achieved despite high defect densities, from polarons to electronic-structure arguments. This will lead into work on developing design rules to identify candidate lead-free alternatives. Next, the symposium will cover the broad classes of perovskite-inspired materials that have been explored. These include (1) bismuth-, antimony-, tin- and germanium-based compounds, (2) double perovskites, (3) mixed anion compounds and (4) chalcogenides. This will focus on growth methods, theoretical investigations, and in-depth spectroscopic investigations into carrier kinetics. This section will also highlight state-of-the-art tools to accelerate materials discovery, such as combinatorial processing and machine learning. The final part of the symposium will focus on efforts to develop the new materials into devices, with particular emphasis on stability.