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Apr18
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The Chemical and Biological Engineering Department is pleased to present a seminar by Prashant V. Kamat from the University of Notre Dame as part of our ChBE Seminar Series.
Dr. Kamat will be presenting a seminar titled "Ion Migration in Metal Halide Perovskites: Implications for Solar Cell Stability."
ABSTRACT:
The ability to tune the bandgap of metal halide perovskites through compositional alloying of the halide ion is of interest in designing tandem solar cells and light emitting displays. However, photoinduced migration of halide ions can significantly affect the device performance. One such property is photoinduced phase segregation in mixed halide perovskites (MHP), which forms bromide rich and iodide-rich domains. These domains act as charge carrier traps and lower the efficiency of perovskite-based devices. The thermodynamic and redox properties of halide perovskites provide a strong driving force for hole trapping and oxidation of iodide species. Thus, the mobility of halides and their susceptibility to hole-induced oxidation play a crucial role in determining the long-term stability of metal halide perovskite solar cells.
When Ruddlesden-Popper 2D mixed-halide perovskite films with spacer cations such as butylammonium are introduced into three-dimensional (3D) perovskite films, they can stabilize them against moisture-induced degradation at room temperature. While such passivation of 3D perovskites using 2D perovskites has been reported widely, the instability of the 2D/3D interface during long term solar cell operation can be problematic. The cation migration under light and heat can significantly alter the 2D/3D interface, thus affecting the solar cell performance. Thus, suppression of halide ion migration as well as cation migration remains a key factor in achieving long term stability and improving efficiency of perovskite solar cells and light emitting devices.
Prashant V. Kamat is a Rev. John A. Zahm, C.S.C., Professor of Science in the Department of Chemistry and Biochemistry and Radiation Laboratory at the University of Notre Dame. He is also a Concurrent Professor in the Department of Chemical and Biomolecular Engineering. Professor Kamat has for more than four decades worked to build bridges between physical chemistry and material science to develop advanced nanomaterials that promise cleaner and more efficient light energy conversion. He has published more than 500 scientific papers that have been well recognized by the scientific community. Thomson-Reuters has featured him as one of the most cited researchers each year since 2014 (2014 -2023). He received Porter Medal in Photochemistry (2022) ACS National Storch Award (2024). He is a Fellow of ACS, MRS, ECS and AAAS. He is also a Pravasi Fellow of the Indian National Science Academy. He is currently serving as the Editor-in-Chief of ACS Energy Letters. (URL:Kamatlab.com)
Suggested Readings:
DuBose, J. T.; Kamat, P. V. Hole Trapping in Halide Perovskites Induces Phase Segregation, Accounts of Materials Research 2022, 3, 761-771.
DuBose, J. T.; Kamat, P. V. Energy Versus Electron Transfer: Managing Excited-State Interactions in Perovskite Nanocrystal–Molecular Hybrids, Chemical Reviews 2022, 122, 12475–12494.
Chakkamalayath, J.; Hiott, N.; Kamat, P. V. How Stable Is the 2D/3D Interface of Metal Halide Perovskite under Light and Heat?, ACS Energy Letters 2023, 8, 169-171.
Szabó, G.; Kamat, P. V., How Cation Migration across a 2D/3D Interface Dictates Perovskite Solar Cell Efficiency ACS Energy Letters 2024 9 (1), 193-200
Bagels and coffee will be provided at 9:30am, and the seminar will start at 9:40am. Please plan to arrive on time to grab a bagel and mingle!
*Please note that there will be no Zoom option for seminars this year.
TIME Thursday, April 18, 2024 at 9:30 AM - 10:45 AM
LOCATION LR4, Technological Institute map it
CONTACT Olivia Wise olivia.wise@northwestern.edu EMAIL
CALENDAR McCormick-Chemical and Biological Engineering (ChBE)
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Jan6
EVENT DETAILS
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TIME Monday, January 6, 2025
CONTACT Office of the Registrar nu-registrar@northwestern.edu EMAIL
CALENDAR University Academic Calendar