Dr. Kuno Masaru - Professor of Chemistry and Biochemistry, University of Notre Dame
Understanding anion and cation migration in hybrid perovskite solar cells
Hybrid perovskites are popular materials for realizing low cost, third generation solar cells. Certified power conversion efficiencies of laboratory scale devices now exceed 20%. Despite engineering advances, which have led to these advances, hybrid perovskites are still plagued by instabilities. The best known relate to moisture instabilities. Less, however, is understood about intrinsic limitations of these materials, stemming from both anion [1,2] and cation migration under illumination or under bias. Understanding the microscopic origin of these instabilities as well as suppressing them represents one of the last major open scientific questions, preventing their commercialization. In this talk, I therefore summarize what is known about anion and cation migration and discuss results from microscopic, spatially-resolved optical measurements we have conducted on both thin films and solar cells.
E. T. Hoke et. al. “Reversible photo-induced trap formation in mixed-halide hybrid perovskites for photovoltaics”, Chem. Sci. 1, 613, (2015) S. Draguta et al. “Rationalizing the light-induced phase separation of mixed halide organic-inorganic perovskites”, Nature Commun. 8, 200, (2017)
Dr. Masaru Kuno earned his PhD in Physical Chemistry at the Massachusetts Institute of Technology. He is Professor of Chemistry and Biochemistry at the University of Notre Dame.
Friday, November 8 at 1:00pm to 2:00pm