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Combined photon-echo, luminescence and Raman spectroscopies of layered ensembles of colloidal quantum dots
摘要： Low-temperature dynamics in layered ensembles of core-double-shell colloidal CdSe/CdS/ZnS quantum dots is studied using different experimental techniques, including photoluminescence and absorption spectroscopy, luminescence microscopy, photon echo, transmission electronic microscopy and Raman scattering. A combination of different techniques clarify the nature and hierarchy of relaxation processes in the quantum dot (QD)-composite under study for a broad range of temperatures and timescales. The parameters of local phonons in QDs was found coincident by luminescence and Raman spectroscopies. Different contributions to optical spectra broadening has been recognized and attributed to certain properties of QDs: quantum size effect, electron-phonon coupling, spectral diffusion and natural excited state lifetime.
关键词： Raman spectroscopy,optical dephasing,photon echo,luminescence spectra,quantum dots (QDs),electronic microscopy,low temperatures
更新于2025-09-23 15:19:57
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[IEEE 2019 International Multi-Conference on Industrial Engineering and Modern Technologies (FarEastCon) - Vladivostok, Russia (2019.10.1-2019.10.4)] 2019 International Multi-Conference on Industrial Engineering and Modern Technologies (FarEastCon) - Study of Solar Cells at Low Temperatures in the Arctic
摘要： Currently, the Arctic is of interest to many countries of the world. The challenge for exploring the Arctic is harsh weather. Researchers have big problems due to global climate change. In the Arctic, it is very difficult for researchers to produce electricity. Most often, they use gas generators that pollute the environment. We propose using solar modules to generate electricity in the Arctic from March to November. Most studies focus on the operation of solar cells at high temperatures and overheating. In the Arctic, most often the temperature is quite low. Even in summer, the temperature does not exceed low 12°C. The topic of the operation of solar cells at temperatures has not been studied well enough. This study focuses on the operation of solar cells at low temperatures. We investigated single-crystal, polycrystalline and amorphous solar cells and found that with decreasing temperature the efficiency of solar cells increases. Polycrystalline and amorphous solar cells have shown the best results.
关键词： solar cell energy production,conversion efficiency,Arctic.,solar cell,low temperatures,power generation,alternative energy sources
更新于2025-09-16 10:30:52