MAT Seminar: Atomically-flat colloidal semiconductor nanocrystals

MAT Seminar: Atomically-flat colloidal semiconductor nanocrystals


Speaker: Yusuf Kelestemur  from ETH Zürich

Title: Atomically-flat colloidal semiconductor nanocrystals: from synthesis to application

Date/Time: July 29, 2019  /  13.40-14.30

Place: FENS 2019

Abstract: Colloidal semiconductor nanocrystals (NCs) have become an exciting class of materials for niche applications ranging from optoelectronics and energy harvesting to biology. In this talk, I will present the recent class of semiconductor NCs: colloidal quantum wells. These atomically-flat nanocrystals enable to access unique optoelectronic characteristics with their quasi-two-dimensional structure, resembling epitaxially-grown quantum wells. They exhibit narrower emission linewidth, larger absorption cross-section, giant oscillator strength, and suppressed Auger recombination as compared to spherically shaped NCs. In the first part of my talk, I will discuss the advanced heterostructures of colloidal quantum wells obtained by designing their three-dimensional structure, tuning their composition and engineering their band alignment. In the second part of my talk, I will focus on the specially designed core/shell heterostructures of colloidal quantum wells for the fabrication of highly efficient light-emitting devices.


BIO: Yusuf Kelestemur received his B.S. degree in Metallurgical and Material Engineering from Middle East Technical University (METU) in 2010, and his M.S. and Ph.D. degrees in Materials Science and Nanotechnology department from Bilkent University in 2012 and 2017, respectively. He has been working as a postdoctoral researcher at ETH Zürich since 2017. His research interests cover the colloidal semiconductor nanocrystals, including their synthesis, characterization, surface engineering, and optoelectronic applications. During his Ph.D. studies, he was awarded with the Optics and Photonics Education Scholarship by SPIE in 2015. He was the recipient of the Marie Curie Individual Fellowship in 2018.

Contact: Emre Erdem / Canan Atilgan