GaN/Cu2O Heterojunctions for Photovoltaic Applications

Hering, K.P.; Brandt, Riley E.; Kramm, B.; Buonassisi, Tonio; Meyer, B. K.

doi:10.1016/j.egypro.2013.12.006

Cited by 5 publications

(3 citation statements)

References 6 publications

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“…The p–n junction is the central building block of a thin‐film photovoltaic cell as it generates the built‐in electric field to separate charge carriers generated by absorption of light. Recently, cuprous oxide, Cu 2 O, with its bandgap of 2.1 eV is discussed as a suitable and promising p‐type absorber material [ 5–7 ] based on abundant chemical elements. To tap the full potential of Cu 2 O as absorber material in thin‐film solar cells, it needs to be combined with a suitable n‐type semiconductor.…”

Section: Introductionmentioning

confidence: 99%

Optimizing the Stoichiometry of Ga₂O₃ Grown by RF‐Magnetron Sputter Deposition by Correlating Optical Properties and Growth Parameters

Schurig

Couturier

Becker

et al. 2019

Physica Status Solidi (a)

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β‐Ga2O3 thin films are deposited by radiofrequency (RF)‐magnetron sputtering on quartz and c‐sapphire substrates using a ceramic stoichiometric Ga2O3 target and a constant flux of argon process gas. Oxygen flux, heater power, and sputtering power are varied in the synthesis of the layers. The resulting Ga2O3 layers are analyzed in terms of their structural and optical properties. Based on this analysis, the process parameters leading to the formation of an optimized β‐Ga2O3 layer are identified. The main challenge in obtaining the stoichiometric β‐Ga2O3 thin films by sputter deposition is to overcome the influence of a strong preferential sputtering of Ga from the ceramic target. This can be achieved by adding a suitable fraction of oxygen to the argon process gas used in the deposition process. Furthermore, it is demonstrated that the refractive index dispersion of β‐Ga2O3 depends strongly on its composition. Thus, a combined analysis of refractive index dispersion and optical bandgap position may serve as a valuable preliminary probe of the thin film's composition.

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Section: Introductionmentioning

confidence: 99%

Optimizing the Stoichiometry of Ga₂O₃ Grown by RF‐Magnetron Sputter Deposition by Correlating Optical Properties and Growth Parameters

Schurig

Couturier

Becker

et al. 2019

Physica Status Solidi (a)

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“…The primary raw material used is copper, which is widely available in nature, has a low cost, and is a simple, inexpensive material manufacturing process. These advantages make the material Cu 2 O have potential applications in various fields: photovoltaics, [25][26] photocatalysts, [27][28][29][30][31][32] gas sensors, [33][34][35] high-performance solar cells, [36][37][38] etc. Cu 2 O has been synthesized by several methods, such as hydrothermal, 39 thermal decomposition, 39 wet precipitation 40 , electrochemical, 41 etc.…”

Section: Introductionmentioning

confidence: 99%

Green Synthesis of Cu<sub>2</sub>O Nanoparticles and Their Application for the Photodegradation of Methyl Orange in Aqueous Media

Nam Ho

2024

Fine Chemical Engineering

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The existence of colorants in water has caused many disadvantages to aquatic systems and the environment. Scientists have made efforts to decompose and remove them using many different methods. In this study, Cu2O nanoparticles were synthesized with a mixture of reducing agents, including glucose and ascorbic acid, as a photocatalyst for decomposing azo dyes. The prepared nano Cu2O was fully characterized using scanning electron microscope (SEM) imaging, X-ray diffraction (XRD) diffraction measurements, and band gap energy determination. The obtained nano Cu2O was of a uniform truncated block shape with particle size ranging from 50 to 150 nm. The prepared nano Cu2O showed remarkable photocatalytic behavior toward methyl orange under visible light radiation with the removal percentage of 95.46% after 4 hours of reaction. In addition, the catalyst can be reused many times without much impact on catalytic efficiency. Photocatalytic degradation using Cu2O nanoparticles is a promising method for the removal of methyl orange, contributing to creating a safe and sustainable environment.

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“…[5][6][7] Recently, several groups have focused on the interface properties of Cu 2 O and were able to increase the V oc up to 1.2 V by using interfacial layers, such as Ga 2 O 3 and ZnO, combined with transparent conductive oxides (TCOs) as top contacts for Cu 2 O thin-film solar cells. [8][9][10][11][12][13][14][15][16][17][18] Light concentration offers another important way to increase the maximum achievable V oc , and thereby the conversion efficiency. 19 Conventional triple junction solar cells typically use macroscopic external optics to provide this concentration effect and increase the efficiency, but nanostructures can inherently concentrate light via optical resonances.…”

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confidence: 99%

Au-Cu2O core-shell nanowire photovoltaics

Oener

Mann

Sciacca

et al. 2015

Applied Physics Letters

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Semiconductor nanowires are among the most promising candidates for next generation photovoltaics. This is due to their outstanding optical and electrical properties which provide large optical cross sections while simultaneously decoupling the photon absorption and charge carrier extraction length scales. These effects relax the requirements for both the minority carrier diffusion length and the amount of semiconductor needed. Metal-semiconductor core-shell nanowires have previously been predicted to show even better optical absorption than solid semiconductor nanowires and offer the additional advantage of a local metal core contact. Here, we fabricate and analyze such a geometry using a single Au-Cu2O core-shell nanowire photovoltaic cell as a model system. Spatially resolved photocurrent maps reveal that although the minority carrier diffusion length in the Cu2O shell is less than 1 μm, the radial contact geometry with the incorporated metal electrode still allows for photogenerated carrier collection along an entire nanowire. Current-voltage measurements yield an open-circuit voltage of 600 mV under laser illumination and a dark diode turn-on voltage of 1 V. This study suggests the metal-semiconductor core-shell nanowire concept could be extended to low-cost, large-scale photovoltaic devices, utilizing for example, metal nanowire electrode grids coated with epitaxially grown semiconductor shells.

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GaN/Cu2O Heterojunctions for Photovoltaic Applications

Cited by 5 publications

References 6 publications

Optimizing the Stoichiometry of Ga₂O₃ Grown by RF‐Magnetron Sputter Deposition by Correlating Optical Properties and Growth Parameters

Optimizing the Stoichiometry of Ga₂O₃ Grown by RF‐Magnetron Sputter Deposition by Correlating Optical Properties and Growth Parameters

Green Synthesis of Cu<sub>2</sub>O Nanoparticles and Their Application for the Photodegradation of Methyl Orange in Aqueous Media

Au-Cu2O core-shell nanowire photovoltaics

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GaN/Cu2O Heterojunctions for Photovoltaic Applications

Cited by 5 publications

References 6 publications

Optimizing the Stoichiometry of Ga2O3 Grown by RF‐Magnetron Sputter Deposition by Correlating Optical Properties and Growth Parameters

Optimizing the Stoichiometry of Ga2O3 Grown by RF‐Magnetron Sputter Deposition by Correlating Optical Properties and Growth Parameters

Green Synthesis of Cu<sub>2</sub>O Nanoparticles and Their Application for the Photodegradation of Methyl Orange in Aqueous Media

Au-Cu2O core-shell nanowire photovoltaics

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Optimizing the Stoichiometry of Ga₂O₃ Grown by RF‐Magnetron Sputter Deposition by Correlating Optical Properties and Growth Parameters

Optimizing the Stoichiometry of Ga₂O₃ Grown by RF‐Magnetron Sputter Deposition by Correlating Optical Properties and Growth Parameters