Title : Engineering of Photophysical Properties in Halide Perovskite Materials for Optoelectronic Applications
Speaker: Dr. Ibrahim Dursun, Department of Electrical Engineering, Penn State University
Date : May 25th, 2021, Tuesday
Time : 17:30
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Meeting ID: 729 064 5404
Halide perovskites have attracted the attention of a broad segment of the optoelectronics field, owing to their outstanding optical and electrical properties, simple low-temperature solution processing, low-cost raw materials, and tunable bandgaps. This talk’s main objective is to engineer the materials’ properties of halide perovskites – their crystallinity, composition, and dimensionality – to understand the fundamental photophysical processes leading to their extraordinary behavior to translate this understanding into optoelectronic applications. In the first part of this talk, I will discuss the synthesis and characterization of Cs-Pb-Br-based perovskite-related single crystals to elucidate the origin of the materials’ emission properties. After that, I will present perovskite nanocrystals (NCs) as a color converter in solid-state lighting and visible light communication. Perovskites NCs’ converted white light (with a high color rendering index of 89 and a color correlated temperature of 3236 K) exhibits an extraordinary modulation bandwidth of 491 MHz and a data transmission rate of 2 Gbit/s. For the second part of the talk, I will focus on developing a facile synthesis method for perovskite microwires and demonstrate efficient photon recycling in those microwires with conclusive spectroscopic evidence. Subsequently, I will present our investigated hot charge carriers in halide perovskites solar cells by a combination of laser spectroscopy and density functional modeling.
Ibrahim Dursun received his undergraduate studies in physics at Izmir Institute of Technology in 2011. After that, Ibrahim obtained his master’s degree in optics and photonics engineering from Aix-Marseille University in France and the Karlsruhe Institute of Technology in Germany, 2013 with the prestigious Erasmus Mundus scholarships provided by the European Union. Recently, Ibrahim has completed his PhD degree from the Material Science and Engineering department at King Abdullah University of Science and Technology (KAUST), Saudi Arabia. Ibrahim authored 28+ publications in peer-reviewed journals, including Nature Communications, JACS, Advanced Energy Materials, ACS Energy Letters, ACS Photonics, Chemistry of Materials, and Applied Physics Letters. He has been working as a postdoctoral researcher at the Electrical Engineering department at Penn State University since June 2019. Currently, he focuses on low refractive index OLEDsfor practical high-efficiency outcoupling and up-conversion as well asthe lasing of halide perovskite materials. Ibrahim was selected as a young scientist in Physics to participate in the Lindau yearly meeting with the Nobel Laureates in 2019. Last year, he was awarded as an outstanding reviewer in 2019 for Light: Science & Applications journal.