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Poor Man’s High Performance Semiconductors: The Incredible Perovskites.

Department of Materials Science & Engineering
Tuesday March 3, 2020
9:45 – 10:45AM ~ Ferris Hall 502
Please join us for refreshments at 9:40

"Poor Man’s High Performance Semiconductors: The Incredible Perovskites."

Speaker: Dr. Mercouri Kanatzidis, Professor 
Charles E. and Emma H. Morrison Professor of Chemistry 
Department of Materials Science & Engineering
Northwestern University-Chicago, IL

How did the recent revolution in the science of halide perovskites begin? The chemical versatility and structure diversity in the class of hybrid organic inorganic main metal halides is astounding. The interplay of weak covalent and ionic bonding in the inorganic framework allows the formation of an amazingly broad variety of structures, most of which can be divided into two larger classes: three-dimensional (3D) and 2D perovskites. Both have undeniably remarkable characteristics for next-generation photovoltaics, which deserve to be better understood. The 2D metal halide perovskites have become highly promising semiconductors for tunable optoelectronic devices. They have a general formula of (A’)2(A)n-1MnX3n+1, where A = Cs+, CH3NH3+ (MA), HC(NH2)2+ (FA), M = Ge2+, Sn2+, Pb2+ and X = Cl-, Br-, I-, are the perovskite components and A’+ = RNH3 is an organic spacer. There are three kinds of 2D organic inorganic hybrid perovskites so far: Ruddelsden-Popper, Cation-ordered and Jacobson-Dion. These vary from one another in the ways the inorganic slabs stack and the way the spacer cations interact with the inorganic slabs. Generally, 2D perovskites form from solution via the bottom-up self-assembly of individual semiconducting perovskite sheets having an adjustable slab thickness of up to a few nanometers & separated by insulating bulky organic molecules. As a result, they behave as natural multiple quantum wells (QWs) with the semiconducting perovskite layers representing the wells and the insulating organic spacers representing the barriers. The width of the barrier is fixed and depends only on the length of the A’ cation, while the width of the well can be adjusted by varying the thickness of perovskite slabs, which is defined by the n variable in (A’)2(A)n-1MnX3n+1. Finally, the so-called “hollow” perovskites are a new form which lies between the conventional 3D and 2D perovskites. While the overall network is 3D there are massive vacancies in it that give the materials different properties. The chemical and structural aspects of these materials will be presented and devices made from them will be described.

Faculty Host: Dr. Bin Hu

Mercouri G Kanatzidis was born in Thessaloniki Greece in 1957. He has a Bachelor of Science degree from Aristotle University in Greece. He received his PhD degree in chemistry from the University of Iowa in 1984. He was a postdoctoral fellow at the University of Michigan and Northwestern University from 1985 to 1987. He currently is a Charles E and Emma H Morrison Professor in Chemistry at Northwestern University.  

Kanatzidis has been named a Presidential Young Investigator by the National Science Foundation, an Alfred P Sloan Fellow, a Beckman Young Investigator, a Camille and Henry Dreyfus Teaching Scholar, a Guggenheim Fellow and in 2003 was awarded the Alexander von Humboldt Prize. In 2014 he received the Einstein Professor Award: Chinese Academy of Sciences, the International Thermoelectric Society Outstanding Achievement Award; and the MRS Medal. In 2016 he also won the Samson Prime Minister's 1M Prize for Innovation in Alternative Fuels for Transportation, 2016 American Chemical Society’s James C. McGroddy Prize for New Materials, American Chemical Society’s Award in Inorganic Chemistry and in 2015 the ENI Award for the "Renewable Energy Prize" and Royal Chemical Society’s De Gennes Prize.  American Institute of Chemistry Chemical Pioneer Award 2018. He is a Fellow of the Royal Society of Chemistry. 2018 - American Institute of Chemistry Chemical Pioneer Award.  2019 - DOE Ten at Ten Scientific Ideas Award for the first demonstration of all-solid-state solar cells using halide perovskite materials.

Tuesday, March 3, 2020 at 9:45am to 10:45am

Ferris Hall, 502
1508 Middle Drive, Knoxville, TN 37996

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Materials Science and Engineering


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