Ions play a major role in performance and stability of perovskite solar cells.in this talk, I will explore the role of ions, and how to reliably estimate their densities and mobilities in CsPbBr3 solar cells. I will show that ion densities typically measured are vastly overestimated because of the effect of organic heterojunction layers and the use of layers that block ions from interacting with organic HTL layers can yield reliable measurements of ion densities. As an alternative, also one can use gold Schottky barriers to collect ions.

Author biography: Dr. Dalal is a Distinguished Professor of Engineering at Iowa State University in the U.S. He has taught at Iowa State for 38 years. He got his BE(Electrical) from VJTI in 1964 and Ph.D. In EE from Princeton University in 1969. He is a Fellow of IEEE,APS and AAAS. He has successfully mentored 42 Ph.D. Students and 65 M.S. Students. He has published extensively in the field of photovoltaics and semiconducting materials and devices and he holds 13 U.S. patents.