Структурні й оптичні характеристики розподілених за розміром квантових точок Cu–In–S, вкритих глутатіоном

• Date: 2023
• Main Authors: Azhniuk, Y.M., Havryliuk, Ye.O., Lopushanska, B.V., Lopushansky, V.V., Gomonnai, A.V., Zahn, D.R.T.
• Format: Article
• Language: English
• Published: Publishing house "Academperiodika" 2023
• Subjects: квантовi точки; колоїдний синтез; оптичне поглинання; фотолюмiнесценцiя; дифракцiя рентгенiвських променiв; раманiвська спектроскопiя
• Online Access: https://ujp.bitp.kiev.ua/index.php/ujp/article/view/2023063
• Journal Title: Ukrainian Journal of Physics

Size-selected series of copper-deficient colloidal Cu–In–S quantum dots (QDs) stabilized with glutathione are obtained by the exchange reaction in aqueous solutions under mild synthesis conditions. The optical bandgap and photoluminescence maximum position shift toward higher energies with decreasing QD size. Based on X-ray diffraction data, the QDs are assigned to a tetragonal chalcopyrite-type structure. The average size of QDs, estimated from the Scherrer formula and from the comparison with the absorption edge-based sizing curves, exhibits a fair agreement, being in the interval of 1.2–2.9 nm. The Raman spectra of Cu–In–S QDs are analyzed with the account for the QD structure, confinement-related effects, non-stoichiometry, and possible existence of secondary phases.