Please use this identifier to cite or link to this item: https://hdl.handle.net/10356/165211
Title: Gradient type‐II CdSe/CdSeTe/CdTe core/crown/crown heteronanoplatelets with asymmetric shape and disproportional excitonic properties
Authors: Shabani, Farzan
Martinez, Pedro Ludwig Hernandez
Shermet, Nina
Korkut, Hilal
Sarpkaya, Ibrahim
Baruj, Hamed Dehghanpour
Delikanli, Savas
Isik, Furkan
Durmusoglu, Emek Goksu
Demir, Hilmi Volkan
Keywords: Engineering::Materials::Nanostructured materials
Issue Date: 2023
Source: Shabani, F., Martinez, P. L. H., Shermet, N., Korkut, H., Sarpkaya, I., Baruj, H. D., Delikanli, S., Isik, F., Durmusoglu, E. G. & Demir, H. V. (2023). Gradient type‐II CdSe/CdSeTe/CdTe core/crown/crown heteronanoplatelets with asymmetric shape and disproportional excitonic properties. Small, 19(11), 2205729-. https://dx.doi.org/10.1002/smll.202205729
Project: M21J9b0085 
RG62/20 
Journal: Small 
Abstract: Characterized by their strong 1D confinement and long-lifetime red-shifted emission spectra, colloidal nanoplatelets (NPLs) with type-II electronic structure provide an exciting ground to design complex heterostructures with remarkable properties. This work demonstrates the synthesis and optical characterization of CdSe/CdSeTe/CdTe core/crown/crown NPLs having a step-wise gradient electronic structure and disproportional wavefunction distribution, in which the excitonic properties of the electron and hole can be finely tuned through adjusting the geometry of the intermediate crown. The first crown with staggered configuration gives rise to a series of direct and indirect transition channels that activation/deactivation of each channel is possible through wavefunction engineering. Moreover, these NPLs allow for switching between active channels with temperature, where lattice contraction directly affects the electron–hole (e–h) overlap. Dominated by the indirect transition channels over direct transitions, the lifetime of the NPLs starts to increase at 9 K, indicative of low dark-bright exciton splitting energy. The charge transfer states from the two type-II interfaces promote a large number of indirect transitions, which effectively increase the absorption of low-energy photons critical for nonlinear properties. As a result, these NPLs demonstrate exceptionally high two-photon absorption cross-sections with the highest value of 12.9 × 106 GM and superlinear behavior.
URI: https://hdl.handle.net/10356/165211
ISSN: 1613-6810
DOI: 10.1002/smll.202205729
Schools: School of Electrical and Electronic Engineering 
School of Physical and Mathematical Sciences 
School of Materials Science and Engineering 
Research Centres: LUMINOUS! Centre of Excellence for Semiconductor Lighting & Displays 
Rights: © 2023 Wiley-VCH GmbH. All rights reserved. This is the peer reviewed version of the following article: Shabani, F., Martinez, P. L. H., Shermet, N., Korkut, H., Sarpkaya, I., Baruj, H. D., Delikanli, S., Isik, F., Durmusoglu, E. G. & Demir, H. V. (2023). Gradient type‐II CdSe/CdSeTe/CdTe core/crown/crown heteronanoplatelets with asymmetric shape and disproportional excitonic properties. Small, 19(11), 2205729-, which has been published in final form at https://doi.org/10.1002/smll.202205729. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Use of Self-Archived Versions.
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:EEE Journal Articles
MSE Journal Articles
SPMS Journal Articles

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