Optical bandgap widening and phase transformation of nitrogen doped cupric oxide

Masudy‐Panah, Saeid; Radhakrishnan, K.; Kumar, Avishek; Wong, Ten It; Ren, Yi; Dalapati, Goutam Kumar

doi:10.1063/1.4936318

Cited by 48 publications

(21 citation statements)

References 40 publications

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“…These investigators report that the impact of nitrogen doping on the crystal quality of CuO thin films significantly depends on its concentration and annealing temperature [43]. Thermal treatment of lightly doped samples with N concentration of 1.5% did not cause significant changes in its crystal structure regardless of annealing temperature.…”

Section: Cuo Thin Film Heterojunction Solar Cellsmentioning

confidence: 99%

Current Status and Future Prospects of Copper Oxide Heterojunction Solar Cells

et al. 2016

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The current state of thin film heterojunction solar cells based on cuprous oxide (Cu2O), cupric oxide (CuO) and copper (III) oxide (Cu4O3) is reviewed. These p-type semiconducting oxides prepared by Cu oxidation, sputtering or electrochemical deposition are non-toxic, sustainable photovoltaic materials with application potential for solar electricity. However, defects at the copper oxide heterojunction and film quality are still major constraining factors for achieving high power conversion efficiency, η. Amongst the Cu2O heterojunction devices, a maximum η of 6.1% has been obtained by using pulsed laser deposition (PLD) of AlxGa1−xO onto thermal Cu2O doped with Na. The performance of CuO/n-Si heterojunction solar cells formed by magnetron sputtering of CuO is presently limited by both native oxide and Cu rich copper oxide layers at the heterointerface. These interfacial layers can be reduced by using a two-step sputtering process. A high η of 2.88% for CuO heterojunction solar cells has been achieved by incorporation of mixed phase CuO/Cu2O nanopowder. CuO/Cu2O heterojunction solar cells fabricated by electrodeposition and electrochemical doping has a maximum efficiency of 0.64% after surface defect passivation and annealing. Finally, early stage study of Cu4O3/GaN deposited on sapphire substrate has shown a photovoltaic effect and an η of ~10−2%.

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Section: Cuo Thin Film Heterojunction Solar Cellsmentioning

confidence: 99%

Current Status and Future Prospects of Copper Oxide Heterojunction Solar Cells

et al. 2016

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“…Therefore, a high‐yield low cost–based electrode fabrication process is required. Sputter deposition and solution‐based thin film deposition process have been used for the synthesis of CuO . Nonvacuum‐based methods such as sol–gel deposition are suitable for thin film deposition and can reduce fabrication cost by replacing vacuum‐based deposition methods with high‐throughput and large‐scale processes.…”

Section: Introductionmentioning

confidence: 99%

“…Sputter deposition and solution-based thin film deposition process have been used for the synthesis of CuO. [17][18][19][20][21] Nonvacuum-based methods such as sol-gel deposition are suitable for thin film deposition and can reduce fabrication cost by replacing vacuum-based deposition methods with high-throughput and large-scale processes. However, sol-gel-deposited thin film has high bulk resistance, low charge transfer rate, and high recombination rate of photogenerated carriers.…”

Section: Introductionmentioning

confidence: 99%

Nanoengineered Advanced Materials for Enabling Hydrogen Economy: Functionalized Graphene–Incorporated Cupric Oxide Catalyst for Efficient Solar Hydrogen Production

et al. 2020

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Cupric oxide (CuO) is a promising candidate as a photocathode for visible‐light‐driven photo‐electrochemical (PEC) water splitting. However, the stability of the CuO photocathode against photo‐corrosion is crucial for developing CuO‐based PEC cells. This study demonstrates a stable and efficient photocathode through the introduction of graphene into CuO film (CuO:G). The CuO:G composite electrodes are prepared using graphene‐incorporated CuO sol–gel solution via spin‐coating techniques. The graphene is modified with two different types of functional groups, such as amine (NH2) and carboxylic acid (COOH). The COOH‐functionalized graphene incorporation into CuO photocathode exhibits better stability and also improves the photocurrent generation compare to control CuO electrode. In addition, COOH‐functionalized graphene reduces the conversion of CuO phase into cuprous oxide (Cu2O) during photo‐electrochemical reaction due to effective charge transfer and leads to a more stable photocathode. The reduction of CuO to Cu2O phase is significantly lesser in CuO:G‐COOH as compared to CuO and CuO:G‐NH2 photocathodes. The photocatalytic degradation of methylene blue (MB) by CuO, CuO:G‐NH2 and CuO:G‐COOH is also investigated. By integrating CuO:G‐COOH photocathode with a sol–gel‐deposited TiO2 protecting layer and Au–Pd nanostructure, stable and efficient photocathode are developed for solar hydrogen generation.

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“…A various method such as electrochemical deposition, thermal evaporation, spin coating, and deep coating can be used to deposit the copper oxide . Among them, sputter deposition was used to prepare the Cu 2 O photocathodes due to the low level of impurity, good uniformity of deposited thin films, precise tuning of film's microstructure, the highest rate of scalability, and reproducibility . To investigate the impact of material properties of deposited thin Cu 2 O films on the photocatalytic activity of prepared Cu 2 O photocathodes, sputtering power was varied during the depositing the thin Cu 2 O film to control the material properties of Cu 2 O and prepare the thin Cu 2 O film with various degree of crystallinity.…”

Section: Introductionmentioning

confidence: 99%

Highly Stable Nanocrystal Engineered Palladium Decorated Cuprous Oxide Photocathode for Hydrogen Generation

Masudy‐Panah

Khiavi²,

Katal

et al. 2019

Adv Materials Inter

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Photocorrosion stability and the discrepancy between optical absorption and carrier diffusion length of cuprous oxide (Cu2O) thin films are the main limiting factors for hydrogen evolution and practical applications of Cu2O photocathodes. In this paper, by nanocrystal engineering the Cu2O optical absorbing thin film, the photocorrosion stability can be significantly improved. Furthermore, palladium (Pd) nanostructures are used to both act as a cocatalysis and address the discrepancy between optical absorption and carrier diffusion length of cuprous oxide and improve the photocatalytic activity of Cu2O photocathodes. By tuning the crystal quality of thin Cu2O film and Pd nanostructures through controlling the sputtering power of Cu2O and in situ plasma of substrate, the impact of the degree of crystallinity of thin Cu2O film and Pd nanostructures on photocorrosion stability and photocatalytic activity of prepared photocathodes are investigated in detail. Systematic characterization of prepared samples by using X‐ray diffraction, high‐resolution transmission electron microscopy, and scanning electron microscope analysis indicates that improving the crystallinity of deposited Cu2O thin film and Pd nanostructures can significantly improve the photocorrosion stability and performance of Cu2O based photocathodes.

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Optical bandgap widening and phase transformation of nitrogen doped cupric oxide

Cited by 48 publications

References 40 publications

Current Status and Future Prospects of Copper Oxide Heterojunction Solar Cells

Current Status and Future Prospects of Copper Oxide Heterojunction Solar Cells

Nanoengineered Advanced Materials for Enabling Hydrogen Economy: Functionalized Graphene–Incorporated Cupric Oxide Catalyst for Efficient Solar Hydrogen Production

Highly Stable Nanocrystal Engineered Palladium Decorated Cuprous Oxide Photocathode for Hydrogen Generation

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