Optical properties of CuSe thin films - band gap determination

Petrović, Marko D.; Gilic, Martina; Ćirković, Jovana; Romčević, M.; Romčević, N.; Trajić, J.; Yahia, I.S.

doi:10.2298/sos1702167p

Cited by 26 publications

(12 citation statements)

References 10 publications

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“…The PL spectra of both CuSe, obtained using an exciting wavelength of 480 nm, are presented in Figure 10 . The weak emission peak located at 520 nm (2.37 eV) detected for both samples is almost consistent with the literature [ 19 ]. The PL intensity for CuSe-PM is higher in comparison with the one prepared in the vibratory mill.…”

Section: Resultssupporting

confidence: 91%

“…The hydrothermal method [ 3 , 8 ], sonochemical method [ 9 ], solution-phase synthetic route [ 10 ], and microwave-assisted method [ 11 ] were employed to prepare hexagonal nanoparticles, spherically shaped nanocrystals, flakes, nanoplatelets, and nanosheets of CuSe. In addition, the synthesis of CuSe in the form of thin films was carried out by various deposition techniques, such as the low-temperature dip type method [ 12 ], pulsed laser deposition [ 7 ], thermal evaporation [ 13 , 14 ], solution growth technique [ 1 ], chemical bath deposition [ 2 , 15 , 16 , 17 ], electrodeposition technique [ 18 ], vacuum evaporation technique [ 19 ], and electrochemical/chemical bath deposition [ 5 ], namely because of the attractiveness of the application of these thin films in the solar cell industry. Among many available methods, mechanochemical synthesis has an inevitable place, due to its environmentally friendly, solventless, and scalable character [ 20 , 21 , 22 ].…”

Section: Introductionmentioning

confidence: 99%

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Comparative Study of Nanostructured CuSe Semiconductor Synthesized in a Planetary and Vibratory Mill

et al. 2020

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Copper(II) selenide, CuSe was prepared from Cu and Se powders in a stoichiometric ratio by a rapid, and convenient one-step mechanochemical synthesis, after 5 and 10 min of milling in a planetary, and an industrial vibratory, mill. The kinetics of the synthesis, and the structural, morphological, optical, and electrical properties of CuSe products prepared in the two types of mill were studied. Their crystal structure, physical properties, and morphology were characterized by X-ray diffraction, specific surface area measurements, particle size distribution, scanning, and transmission electron microscopy. The products crystallized in a hexagonal crystal structure. However, a small amount of orthorhombic phase was also identified. The scanning electron microscopy revealed that both products consist of agglomerated particles of irregular shape, forming clusters with a size ~50 mm. Transmission electron microscopy proved the nanocrystalline character of the CuSe particles. The optical properties were studied using UV–Vis and photoluminescence spectroscopy. The determined band gap energies of 1.6 and 1.8 eV for the planetary- and vibratory-milled product, respectively, were blue-shifted relative to the bulk CuSe. CuSe prepared in the vibratory mill had lower resistivity and higher conductivity, which corresponds to its larger crystallite size in comparison with CuSe prepared in the planetary mill.

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Section: Resultssupporting

confidence: 91%

Section: Introductionmentioning

confidence: 99%

Comparative Study of Nanostructured CuSe Semiconductor Synthesized in a Planetary and Vibratory Mill

et al. 2020

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“…Copper selenide presents direct and indirect transitions, and the corresponding band gaps range between 2-3 eV and 1.1-1.5 eV, respectively. In the nanoscale, such values can reach 4 eV and 1.87 eV for direct and indirect transitions [4,42]. Copper sulfide has a band gap in the range 1.2-2 eV for its bulk form [43,44], with certain stoichiometries displaying indirect transitions, whereas others possess direct transitions [45,46].…”

Section: Tauc Plots-band Gapsmentioning

confidence: 99%

Heat-Up Colloidal Synthesis of Shape-Controlled Cu-Se-S Nanostructures—Role of Precursor and Surfactant Reactivity and Performance in N2 Electroreduction

et al. 2021

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Copper selenide-sulfide nanostructures were synthesized using metal-organic chemical routes in the presence of Cu- and Se-precursors as well as S-containing compounds. Our goal was first to examine if the initial Cu/Se 1:1 molar proportion in the starting reagents would always lead to equiatomic composition in the final product, depending on other synthesis parameters which affect the reagents reactivity. Such reaction conditions were the types of precursors, surfactants and other reagents, as well as the synthesis temperature. The use of ‘hot-injection’ processes was avoided, focusing on ‘non-injection’ ones; that is, only heat-up protocols were employed, which have the advantage of simple operation and scalability. All reagents were mixed at room temperature followed by further heating to a selected high temperature. It was found that for samples with particles of bigger size and anisotropic shape the CuSe composition was favored, whereas particles with smaller size and spherical shape possessed a Cu2−xSe phase, especially when no sulfur was present. Apart from elemental Se, Al2Se3 was used as an efficient selenium source for the first time for the acquisition of copper selenide nanostructures. The use of dodecanethiol in the presence of trioctylphosphine and elemental Se promoted the incorporation of sulfur in the materials crystal lattice, leading to Cu-Se-S compositions. A variety of techniques were used to characterize the formed nanomaterials such as XRD, TEM, HRTEM, STEM-EDX, AFM and UV-Vis-NIR. Promising results, especially for thin anisotropic nanoplates for use as electrocatalysts in nitrogen reduction reaction (NRR), were obtained.

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“…They may also have different crystallographic forms (monoclinic, cubic, tetragonal, hexagonal, etc.). Copper selenides are p-type semiconductors, with both direct and indirect bandgap (Petrović et al, 2017), which may be potentially employed as PV absorbers. CuSe at room temperature has a hexagonal structure and undergoes an orthorhombic transition at 48°C and a hexagonal transition at 120°C.…”

Section: Emerging Earth-abundant Chalcogenide Pv Absorbersmentioning

confidence: 99%

New Earth-Abundant Thin Film Solar Cells Based on Chalcogenides

2019

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At the end of 2017 roughly 1.8% of the worldwide electricity came from solar photovoltaics (PV), which is foreseen to have a key role in all major future energy scenarios with an installed capacity around 5 TW by 2050. Despite silicon solar cells currently rule the PV market, the extremely more versatile thin film-based devices (mainly Cu(In,Ga)Se 2 and CdTe ones) have almost matched them in performance and present room for improvement. The low availability of some elements in the present commercially available PV technologies and the recent strong fall of silicon module price below 1 $/W p focused the attention of the scientific community on cheap earth-abundant materials. In this framework, thin film solar cells based on Cu 2 ZnSnS 4 (CZTS) and the related sulfur selenium alloy Cu 2 ZnSn(S,Se) 4 (CZTSSe) were strongly investigated in the last 10 years. More recently, chalcogenide PV absorbers potentially able to face TW range applications better than CZTS and CZTSSe due to the higher abundance of their constituting elements are getting considerable attention. They are based on both MY 2 (where M = Fe, Cu, Sn and Y = S and/or Se) and Cu 2 XSnY 4 (where X = Fe, Mn, Ni, Ba, Co, Cd and Y = S and/or Se) chalcogenides. In this work, an extensive review of emerging earth-abundant thin film solar cells based on both MY 2 and Cu 2 XSnY 4 species is given, along with some considerations on the abundance and annual production of their constituting elements.

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Optical properties of CuSe thin films - band gap determination

Cited by 26 publications

References 10 publications

Comparative Study of Nanostructured CuSe Semiconductor Synthesized in a Planetary and Vibratory Mill

Comparative Study of Nanostructured CuSe Semiconductor Synthesized in a Planetary and Vibratory Mill

Heat-Up Colloidal Synthesis of Shape-Controlled Cu-Se-S Nanostructures—Role of Precursor and Surfactant Reactivity and Performance in N2 Electroreduction

New Earth-Abundant Thin Film Solar Cells Based on Chalcogenides

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