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Temperature- and Size-Dependent Photoluminescence of CuInS2 Quantum Dots
Oleg Korepanov1, Dmitriy Kozodaev1,2, Olga Aleksandrova1
1Micro- and Nanoelectronics Department, Saint Petersburg Electrotechnical University "LETI", 197022 Saint Petersburg, Russia.
Abstract:
We present the results of a temperature-dependent photoluminescence (PL) spectroscopy study on CuInS2 quantum dots (QDs). In order to elucidate the influence of QD size on PL temperature dependence, size-selective precipitation was used to obtain several nanoparticle fractions. Additionally, the nanoparticles' morphology and chemical composition were studied using transmission electron microscopy, X-ray diffraction, and X-ray photoelectron spectroscopy. The obtained QDs showed luminescence in the visible-near infrared range. The PL energy, linewidth, and intensity were studied within an 11-300 K interval. For all fractions, a temperature decrease led to a shift in the emission maximum to higher energies and pronounced growth of the PL intensity down to 75-100 K. It was found that for large particle fractions, the PL intensity started to decrease, with temperature decreasing below 75 K, while the PL intensity of small nanoparticles remained stable.
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