Title
Engineering excitonic dynamics and environmental stability of post-transition metal chalcogenides by pyridine functionalization technique Engineering excitonic dynamics and environmental stability of post-transition metal chalcogenides by pyridine functionalization technique
Author
Faculty/Department
Faculty of Sciences. Physics
Publication type
article
Publication
Cambridge ,
Subject
Physics
Chemistry
Engineering sciences. Technology
Source (journal)
Nanoscale / Royal Society of Chemistry. - Cambridge
Volume/pages
7(2015) :40 , p. 17109-17115
ISSN
2040-3364
ISI
000362662100067
Carrier
E
Target language
English (eng)
Full text (Publishers DOI)
Affiliation
University of Antwerp
Abstract
Owing to their strong photon emission, low excitonic binding energies, and nearly-ideal band offset values for water splitting reactions, direct gap quasi-2D gallium chalcogenides are potential candidates for applications in energy harvesting, optoelectronics, and photonics. Unlike other 2D materials systems, chemical functionalization of gallium chalcogenides is still at its seminal stages. Here, we propose vapor phase pyridine intercalation technique to manipulate optical properties of gallium chalcogenides. After functionalization, the excitonic dynamics of quasi-2D GaSe change significantly as evidenced by an increase in integrated PL intensity and emergence of a new emission feature that is below the band edge. Based on our DFT calculations, we attribute these to formation of bound exciton complexes at the trap sites introduced by chemical reaction between pyridine and GaSe. On the contrary, pyridine functionalization does not impact the optical properties of GaTe, instead treats GaTe surface to prevent oxidization of tellurium atoms. Overall, results suggest novel ways to control properties of gallium chalcogenides on demand and unleash their full potential for a range of applications in photonics and optoelectronics.
http://cmt.ua.ac.be/hsahin/publishedpapers/46.pdf
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