Electrochemical deposition of Ag 2 Se nanostructures

Genovese, Luigi; Cocchiara, Cristina; Piazza, S.; Sunseri, C.; Inguanta, Rosalinda

doi:10.1016/j.materresbull.2016.09.033

Cited by 15 publications

(6 citation statements)

References 39 publications

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“…It is currently unclear why the Ag 2 Se sample did not appear to be Raman-active, contrary to the earlier studies presented in the literature. 42,43 Figure 2a shows that the samples with the strongest Raman response under these measurement conditions are AgGaSe 2 and Ga 2 Se 3 . Therefore, if these are present in a phase mixture, they are expected to provide a dominant signal.…”

Section: Resultsmentioning

confidence: 98%

Investigation of AgGaSe₂ as a Wide Gap Solar Cell Absorber

Larsen

Donzel‐Gargand

Sopiha

et al. 2021

ACS Appl. Energy Mater.

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The compound AgGaSe 2 has received limited attention as a potential wide gap solar cell material for tandem applications, despite its suitable band gap. This study aims to investigate the potential of this material by deposition of thin films by co-evaporation and production of solar cell devices. Since AgGaSe 2 has a very low tolerance to off-stoichiometry, reference materials of possible secondary phases in the Ag 2 Se−Ga 2 Se 3 system were also produced. Based on these samples, it was concluded that X-ray diffraction is suited to distinguish the phases in this material system. An attempt to use Raman spectroscopy to identify secondary phases was less successful. Devices were produced using absorbers containing the secondary phases likely formed during co-evaporation. When grown under slightly Ag-rich conditions, the Ag 9 GaSe 6 secondary phase was present along with AgGaSe 2 , which resulted in devices being shunted under illumination. When absorbers were grown under Ag-deficient conditions, the AgGa 5 Se 8 secondary phase was observed, making the device behavior dependent on the processing route. Deposition with a three-stage evaporation (Ag-poor, Ag-rich, and Ag-poor) resulted in AgGa 5 Se 8 layers at both front and back surfaces, leading to charge carrier blocking in devices. Deposition of the absorber with a one-stage process, on the other hand, caused the formation of AgGa 5 Se 8 locally extended through the entire film, but no continuous layer was found. As a consequence, these devices were not blocking and achieved an efficiency of up to 5.8%, which is the highest reported to date for AgGaSe 2 solar cells.

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Section: Resultsmentioning

confidence: 98%

Investigation of AgGaSe₂ as a Wide Gap Solar Cell Absorber

Larsen

Donzel‐Gargand

Sopiha

et al. 2021

ACS Appl. Energy Mater.

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“…Until to date, the thermoelectric properties of electrodeposited silver selenide have not been reported. The few studies found in the literature are focused on the growth and crystallographic structure, morphological, and optical characterization of thin films [29][30][31][32] or nanostructures 33,34 , but not on their thermoelectric properties. In the mentioned studies, to avoid the precipitation of the elements, either aqueous solutions with a complexing agent such as EDTA 30,32 , SCN -29 , TEA, or TSC 34 or organic solvents such as DMSO 33 were employed.…”

Section: Sustainable Energy and Fuels Accepted Manuscriptmentioning

confidence: 99%

High thermoelectric efficiency in electrodeposited silver selenide films: from Pourbaix diagram to a flexible thermoelectric module

Manzano

Olmo

Caballero‐Calero

et al. 2021

Sustainable Energy Fuels

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“…The phase composition and the crystallographic structure of the synthesized Ag-Se material were determined by XRD analysis. Figure 3 shows the XRD pattern of the Ag2Se powder prepared by BM Ag and Se in a stoichiometric ratio of 2:1 for 2.5 h. The majority of the peaks are well indexed by the pattern that is most commonly reported in literature (PDF# 24-1041) [25], identifying the orthorhombic structure (α-Ag2Se) with a space group of P2 1 2 1 2 1 [40][41][42]. According to the XRD analysis, the synthesized material seems to be of a single-phase, as there is no indication of excess Ag or Se, and it is probably stoichiometric.…”

Section: Pos(bpu11)211mentioning

confidence: 86%

Synthesis and Characterization of Al-doped nanostructured Mg2Si and Ag2Se by Pack Cementation and Ball Milling Processes

Stathokostopoulos,

Sidiropoulos,

Karagiannis

et al. 2023

Proceedings of 11th International Conference of the Balkan Physical Union — PoS(BPU11)

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Thermoelectricity is a green method of energy production by converting waste heat into electricity. Silicides and selenides are candidate materials for thermoelectric applications due to their high performance in their operating temperature range. Additionally, they are composed of abundant and negligibly toxic elements. The current study focuses on the fabrication of alternative thermoelectric materials, aiming to develop compounds with advanced thermoelectric properties. Pure Mg 2 Si and Aldoped Mg 2 Si samples are synthesized by Pack Cementation, and Ag 2 Se powder is produced via Ball Milling (BM). The chosen synthesis methods are suggested as environmentally friendly, fast and economic. The samples were structurally characterized by X-ray diffraction (XRD), while the morphology and the chemical composition were studied by X-ray photoelectron spectroscopy (XPS) and scanning electron microscopy (SEM). In the case of magnesium silicide, the thermoelectric phase was formed without residual traces of the initial elemental powders. The Al addition diffused in the material homogeneously and no secondary phases were developed. Regarding the Ag 2 Se powder, α-phase (low temperature) was obtained after 2.5 h of mechanical alloying (BM) the elements. SEM and XPS analysis detected traces of unreacted Ag and Se, indicating that the ball milling process should last longer to achieve a complete reaction between the elements.

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Electrochemical deposition of Ag 2 Se nanostructures

Cited by 15 publications

References 39 publications

Investigation of AgGaSe₂ as a Wide Gap Solar Cell Absorber

Investigation of AgGaSe₂ as a Wide Gap Solar Cell Absorber

High thermoelectric efficiency in electrodeposited silver selenide films: from Pourbaix diagram to a flexible thermoelectric module

Synthesis and Characterization of Al-doped nanostructured Mg2Si and Ag2Se by Pack Cementation and Ball Milling Processes

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Electrochemical deposition of Ag 2 Se nanostructures

Cited by 15 publications

References 39 publications

Investigation of AgGaSe2 as a Wide Gap Solar Cell Absorber

Investigation of AgGaSe2 as a Wide Gap Solar Cell Absorber

High thermoelectric efficiency in electrodeposited silver selenide films: from Pourbaix diagram to a flexible thermoelectric module

Synthesis and Characterization of Al-doped nanostructured Mg2Si and Ag2Se by Pack Cementation and Ball Milling Processes

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Investigation of AgGaSe₂ as a Wide Gap Solar Cell Absorber

Investigation of AgGaSe₂ as a Wide Gap Solar Cell Absorber