Trinkler, L.; Dai, D.; Chang, L.; Chou, M.M.-C.; Wu, T.-Y.; Gabrusenoks, J.; Nilova, D.; Ruska, R.; Berzina, B.; Nedzinskas, R. Luminescence Properties of Epitaxial Cu2O Thin Films Electrodeposited on Metallic Substrates and Cu2O Single Crystals. Materials2023, 16, 4349.
Trinkler, L.; Dai, D.; Chang, L.; Chou, M.M.-C.; Wu, T.-Y.; Gabrusenoks, J.; Nilova, D.; Ruska, R.; Berzina, B.; Nedzinskas, R. Luminescence Properties of Epitaxial Cu2O Thin Films Electrodeposited on Metallic Substrates and Cu2O Single Crystals. Materials 2023, 16, 4349.
Trinkler, L.; Dai, D.; Chang, L.; Chou, M.M.-C.; Wu, T.-Y.; Gabrusenoks, J.; Nilova, D.; Ruska, R.; Berzina, B.; Nedzinskas, R. Luminescence Properties of Epitaxial Cu2O Thin Films Electrodeposited on Metallic Substrates and Cu2O Single Crystals. Materials2023, 16, 4349.
Trinkler, L.; Dai, D.; Chang, L.; Chou, M.M.-C.; Wu, T.-Y.; Gabrusenoks, J.; Nilova, D.; Ruska, R.; Berzina, B.; Nedzinskas, R. Luminescence Properties of Epitaxial Cu2O Thin Films Electrodeposited on Metallic Substrates and Cu2O Single Crystals. Materials 2023, 16, 4349.
Abstract
Luminescent properties of epitaxial Cu2O thin films were studied in 10-300 K temperature range and compared with luminescent properties of Cu2O single crystals. Cu2O thin films were deposited epitaxially by the electrodeposition method on either Cu or Ag substrates at different processing parameters, which determined the epitaxial orientation relationships and encapsulated surface. Cu2O (100) and (111) single crystal samples were cut from a crystal rod grown by the floating zone method. Luminescence spectra of thin films contain the same emission bands as single crystals around 720, 810 and 910 nm, characterizing VO2+, VO+ and VCu defects, correspondingly. Additional emission bands, whose origin is under discussion, are observed around 650-680 nm, while the exciton features are negligibly small. The relative mutual contribution of the emission bands varies depending on the particular thin film sample. Existence of the domains of crystallites with different orientation determines the polarization of luminescence. PL of both Cu2O thin films and single crystals is characterized with negative thermal quenching in the low temperature region, the reason of this phenomenon is discussed.
Chemistry and Materials Science, Materials Science and Technology
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