Optical properties and structure of amorphous silicon films prepared by CVD

Janai, M.; Allred, David D.; Booth, D. C.; Seraphin, B. O.

doi:10.1016/0165-1633(79)90053-4

Cited by 128 publications

(20 citation statements)

References 38 publications

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“…Among them, most of the commercially selective surfaces are constructed as absorberreflector tandems [3][4][5]. A tandem absorber consists of at least two layers with different optical properties: a coating having high absorptance in the solar wavelength range is deposited onto a highly IR-reflecting metal substrate.…”

Section: Introductionmentioning

confidence: 99%

The influence of oxygen in TiAlOxNy on the optical properties of colored solar-absorbing coatings

Zhu

Mao

Zhao

2012

Solar Energy Materials and Solar Cells

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Abstract:Low cost and ease of fabrication are important factors for solar-thermal applications in energyefficient buildings. This contribution reports the influence of oxygen on structure, optical properties and chromaticity of TiAlO x N y thin films prepared by DC magnetron sputtering. It is an extension of a previous study on colored solar-thermal absorbers based on titanium-aluminum nitride. The purpose is to investigate the possibility of using TiAlO x N y as middle layer to achieve a gradient effect.The results reveal that the structure and optical properties of the TiAlO x N y coatings are sensitive to the oxygen content under certain sputtering conditions. The ratio of oxygen/nitrogen of 0.7:10 is the most appropriate to form the crystalline structure of TiAlON. The optical constants of TiAlN and TiAlON were deduced by fitting the experimental data. It shows that both the refractive index (n) and the extinction coefficient (κ) are decreased when oxygen is introduced to form titanium-aluminium nitro-oxide. The gradient effect can be achieved and controlled by adjusting the ratio of oxygen/nitrogen flow during the process to enhance solar absorptance while keeping the desired color appearance.

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Section: Introductionmentioning

confidence: 99%

The influence of oxygen in TiAlOxNy on the optical properties of colored solar-absorbing coatings

Zhu

Mao

Zhao

2012

Solar Energy Materials and Solar Cells

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“…A complex dielectric function of amorphous silicon should be used. However, the complex dielectric function of amorphous silicon depends on the growth conditions [28], and no tabulated data was found. Furthermore, we determined the difference in structural resonance between silicon patterned with a GPSC and silicon patterned with a conventional photonic crystal.…”

Section: Description Of Graded Photonic Super-crystals and Simulationmentioning

confidence: 99%

Extraordinary Light-Trapping Enhancement in Silicon Solar Cell Patterned with Graded Photonic Super-Crystals

et al. 2017

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Light-trapping enhancement in newly discovered graded photonic super-crystals (GPSCs) with dual periodicity and dual basis is herein explored for the first time. Broadband, wide-incident-angle, and polarization-independent light-trapping enhancement was achieved in silicon solar cells patterned with these GPSCs. These super-crystals were designed by multi-beam interference, rendering them flexible and efficient. The optical response of the patterned silicon solar cell retained Bloch-mode resonance; however, light absorption was greatly enhanced in broadband wavelengths due to the graded, complex unit super-cell nanostructures, leading to the overlap of Bloch-mode resonances. The broadband, wide-angle light coupling and trapping enhancement mechanism are understood to be due to the spatial variance of the index of refraction, and this spatial variance is due to the varying filling fraction, the dual basis, and the varying lattice constants in different directions.

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“…This is mainly due to the highly disordered structure causing more available free volume to be present, allowing for accommodation of the volume related stress and strain. a-Si in 2D form can be obtained by RF/magnetron sputtering from silicon targets, pulsed laser deposition, or thermal/plasma/microwave assisted decomposition of silicon precursors such as silane or organosilane precursors [12][13][14][15][16][17][18][19][20][21][22]. However, on an industrial scale these techniques are expensive, involve high installation/maintenance costs, and have major safety issues since they involve explosive Si precursors.…”

Section: Introductionmentioning

confidence: 99%

Pulsed Current Electrodeposition of Silicon Thin Films Anodes for Lithium Ion Battery Applications

et al. 2017

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Electrodeposition of amorphous silicon thin films on Cu substrate from organic ionic electrolyte using pulsed electrodeposition conditions has been studied. Scanning electron microscopy analysis shows a drastic change in the morphology of these electrodeposited silicon thin films at different frequencies of 0, 500, 1000, and 5000 Hz studied due to the change in nucleation and the growth mechanisms. These electrodeposited films, when tested in a lithium ion battery configuration, showed improvement in stability and performance with an increase in pulse current frequency during deposition. XPS analysis showed variation in the content of Si and oxygen with the change in frequency of deposition and with the change in depth of these thin films. The presence of oxygen largely due to electrolyte decomposition during Si electrodeposition and the structural instability of these films during the first discharge-charge cycle are the primary reasons contributing to the first cycle irreversible (FIR) loss observed in the pulse electrodeposited Si-O-C thin films. Nevertheless, the silicon thin films electrodeposited at a pulse current frequency of 5000 Hz show a stable capacity of~805 mAh·g −1 with a fade in capacity of~0.056% capacity loss per cycle (a total loss of capacitỹ 246 mAh·g −1 ) at the end of 500 cycles.

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Optical properties and structure of amorphous silicon films prepared by CVD

Cited by 128 publications

References 38 publications

The influence of oxygen in TiAlOxNy on the optical properties of colored solar-absorbing coatings

The influence of oxygen in TiAlOxNy on the optical properties of colored solar-absorbing coatings

Extraordinary Light-Trapping Enhancement in Silicon Solar Cell Patterned with Graded Photonic Super-Crystals

Pulsed Current Electrodeposition of Silicon Thin Films Anodes for Lithium Ion Battery Applications

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