Semiconductor Nanocrystal Optoelectronics: from colloidal Quantum Dots to Wells
Hilmi Volkan Demir a b
a Department of Electrical and Electronics Engineering, Department of Physics, and UNAM–Institute of Materials Science and Nanotechnology, Bilkent University, Ankara 06800, Turkey.
b NTU Singapore – Nanyang Technological University, School of Electrical Engineering, School of Physical and Mathematical Sciences, School of Materials Science andEngineering, Singapore
Proceedings of Internet Conference for Quantum Dots (iCQD)
Online, Spain, 2020 July 14th - 17th
Organizers: Quinten Akkerman, Raffaella Buonsanti, Zeger Hens and Maksym Kovalenko
Invited Speaker, Hilmi Volkan Demir, presentation 055
Publication date: 3rd July 2020

Solution-processed semiconductor nanocrystals have been attracting increasingly greater interestin photonicsincluding spectrally pure color conversion and enrichment in quality lighting and display backlighting [1,2]. These nanocrystals span different types and structures of semiconductors in the forms of colloidal quantum dots and rods to a more recently developing class of colloidal quantum wells. In this talk, we will introduce the emerging field of nanocrystal optoelectronics using solution-processed, efficient, quantum emitters: through the journey of colloidal quantum dots to wells. In particular, we will present a new concept of all-colloidal lasers developed by incorporating nanocrystal emitters as the optical gain media, intimately integrated into fully colloidal cavities [3]. In the talk, we will then focus on our recent work on the latest rising star of tightly-confined atomically-flat nanocrystals, the quasi-2D colloidal quantum wells (CQWs), also popularly nick-named ‘nanoplatelets’. Among various extraordinary features of these CQWs, we will present our most recent discovery that the CQWs uniquely enable record high optical gain coefficients among all colloids [4]. In addition, we will show our results on the controlled stacking and assemblies of these nanoplatelets, which provides us with the ability to tune and master their excitonic properties [5], present the first accounts of doping them for high-flux solar concentration and precise wavefunction-engineered magnetic properties [6], and our record high-efficiency LEDs [7]. Given their current accelerating progress, these solution-processed quantum materials hold great promise to challenge their epitaxial thin-film counterparts in semiconductor optoelectronics in the nearfuture.

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