TY - JOUR
T1 - Engineering excitonic dynamics and environmental stability of post-transition metal chalcogenides by pyridine functionalization technique
AU - Meng, Xiuqing
AU - Pant, Anupum
AU - Cai, Hui
AU - Kang, Jun
AU - Sahin, Hasan
AU - Chen, Bin
AU - Wu, Kedi
AU - Yang, Sijie
AU - Suslu, Aslihan
AU - Peeters, F. M.
AU - Tongay, Sefaattin
N1 - Publisher Copyright:
© 2015 The Royal Society of Chemistry.
PY - 2015/10/28
Y1 - 2015/10/28
N2 - 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.
AB - 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.
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U2 - 10.1039/c5nr04879f
DO - 10.1039/c5nr04879f
M3 - Article
AN - SCOPUS:84944088698
SN - 2040-3364
VL - 7
SP - 17109
EP - 17115
JO - Nanoscale
JF - Nanoscale
IS - 40
ER -