Time:16:00-17:00

Place:TPOC-3, Nobel str., Blue Building, Room 408

Speaker: Dr. Moneim Ismail, senior research scientist with the Center for Electrochemical Energy Storage Title: Under the Spotlight: The Rise of Organic-Inorganic Perovskite Solar Cells

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Abstract: The power conversion efficiency of organic-inorganic perovskite Solar cells (PVKs) has soared from 3.8% in 2009 to a current world record of 22.7%. Perovskite materials not only show exceptional optoelectronic properties (such as tunable direct bandgaps, high optical absorption, and long charge carrier diffusion lengths), but they are also very attractive because of their easy processability from solution and large availability of their chemical components. Perovskite materials are a true alternative for silicon but still have to pass the long-term stability test. My talk will cover the rise of perovskite photovoltaics, and possible pathways to stabilize perovskite devices. In the last part of the talk, I will present our results of efficient n-i-p and p-i-n PVKs using interface-related approaches. By using metal oxide and new organic semiconducting interlayers, we fabricated PVK devices with power conversion efficiencies exceeding 17.

Abstract: Oxygen deficient perovskite oxides ABO₃-δ are mixed ionic and electronic conductors (MIEC) and represent a playground to discover new catalysts for high temperature oxygen electrocatalysis and room temperature ORR/OER in alkaline medium. For example, SrCoO₃-δ based perovskites Sm_0.5Sr_0.5CoO₃-δ, SrCo_0.8Fe_0.2O₃-δ, La_0.6Sr_0.4Co_0.2Fe_0.8O₃-δ, Ba_0.5Sr_0.5Co_0.8Fe_0.2O₃-δ, and SrNb0.1Co0.9O3-δ exhibit high activity in intermediate temperature solid oxide fuel cells. Moreover, Ba_0.5Sr_0.5Co_0.8Fe_0.2O₃-δ (BSCF) was reported as an efficient OER catalyst in water electrolysis. In this presentation, key insights of activity descriptors and reaction mechanisms for water electrolysis will be discussed.