A flux analysis of multiple junction solar cells: The general equations, with computations for an n-CdS/n-GaAs photoanode

Hinckley, Steven; McCann, Joshua C; Haneman, D.

doi:10.1016/0379-6787(86)90021-9

Cited by 10 publications

(5 citation statements)

References 23 publications

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“…Instead, the photogenerated e -/h + pairs in the Si recombine so that there is no net charge flux. 19,33 Therefore, photo-oxidation cannot take place at the TiO 2 surface unless carriers are photogenerated in the TiO 2 shell.…”

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confidence: 99%

“…Photogenerated holes in Si cannot be transferred to the valence band of TiO 2 since there is a significant barrier at the junction (Figure c,d). Instead, the photogenerated e − / h + pairs in the Si recombine so that there is no net charge flux. , Therefore, photo-oxidation cannot take place at the TiO 2 surface unless carriers are photogenerated in the TiO 2 shell.…”

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confidence: 99%

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High Density n-Si/n-TiO₂Core/Shell Nanowire Arrays with Enhanced Photoactivity

Hwang¹,

Boukai²,

Yang³

2009

Nano Lett.

554

503

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There are currently great needs to develop low-cost inorganic materials that can efficiently perform solar water splitting as photoelectrolysis of water into hydrogen and oxygen has significant potential to provide clean energy. We investigate the Si/TiO2 nanowire heterostructures to determine their potential for the photooxidation of water. We observed that highly dense Si/TiO2 core/shell nanowire arrays enhanced the photocurrent by 2.5 times compared to planar Si/TiO2 structure due to their low reflectance and high surface area. We also showed that n-Si/n-TiO2 nanowire arrays exhibited a larger photocurrent and open circuit voltage than p-Si/n-TiO2 nanowires due to a barrier at the heterojunction.

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confidence: 99%

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confidence: 99%

High Density n-Si/n-TiO₂Core/Shell Nanowire Arrays with Enhanced Photoactivity

Hwang¹,

Boukai²,

Yang³

2009

Nano Lett.

554

503

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“…Under the simulated solar light irradiation, the UV spectral region can be utilized by the TiO 2 nanowires and the visible spectral region can be utilized by the porous Si, which leads to the producing of the electron-hole pairs. Holes in valence band of porous Si and electrons in conduction band of TiO 2 nanowire are recombined [29,33,34], which is harmful to the PEC This leads to the high separation efficiency and transmission efficiency of electrons and holes in the porous Si/TiO 2 nanowire heterostructure. Thus, the heterostructure effect leads to the high photocurrent and PEC activity of the porous Si/TiO 2 nanowire heterostructure.…”

Section: Resultsmentioning

confidence: 99%

Photoelectrochemical Properties of Porous Si/TiO₂ Nanowire Heterojunction Structure

Wang

Yang

Zhao

et al. 2020

Journal of Nanomaterials

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The porous silicon as substrate material was prepared by metal-assisted chemical etching (MACE) method. The TiO2 nanowire cover layer on porous silicon was prepared by hydrothermal method. Thus, porous Si/TiO2 nanowire heterostructure was obtained. The formation of the porous Si/TiO2 nanowire heterostructure was confirmed by X-ray diffraction (XRD) and scanning electron microscope (SEM). The results of diffuse reflection spectra (DRS) show that porous Si/TiO2 nanowire has the highest antireflectivity among the four tested samples. Photoelectric catalysis (PEC) and photocurrent measurement show that the porous Si/TiO2 nanowire heterostructure has higher photoelectric catalytic and photocurrent activity than the other samples under the simulated solar light and visible light irradiation. The results showed that the construction of the porous Si/TiO2 nanowire heterostructure improved the photoelectrochemical properties, which is attributed to the heterogeneous effect and window effect.

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“…Secondly, the scale of the TiO 2 nanowire layer of the porous Si/TiO 2 nanowire photoanode influences the PEC activity and the photocurrent. Although increasing the length and diameter of nanowires is an effective way to improve the specific surface and performance of the electrode, there is an optimal thickness of the front wide‐bandgap semiconductor for a heterojunction with a planar film structure . If the scale is larger than the diffusion range of charge carriers, those charge carriers will be lost in recombination .…”

Section: Resultsmentioning

confidence: 99%

“…If the TiO 2 nanowire layer is too thin (Figure a,b), enough pairs of electrons and holes cannot be generated, which leads to a low photocurrent and PEC activities as shown in Figure (a,b). At the optimum scale (Figure c), enough electron–hole pairs can be generated, and the recombination rate is low as shown in Figure (c).…”

Section: Resultsmentioning

confidence: 99%

Porous Si/TiO₂ nanowire photoanode for photoelectric catalysis under simulated solar light irradiation

Zhangxiaoxiong

Yang

et al. 2018

Applied Organom Chemis

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Porous Si/TiO 2 nanowire photoanodes were prepared by a combination of hydrothermal synthesis and metal-assisted chemical etching. Characterization of samples was conducted using scanning electron microscopy and X-ray diffraction, the results showing that a porous Si/TiO 2 heterojunction structure was synthesized. Diffuse reflection spectra show that the porous Si/TiO 2 nanowire photoanodes have a strong absorption. Photocurrent measurement shows that the photocurrent of the porous Si/TiO 2 nanowire photoanodes at 6 h is higher than that of others in the measuring region. The photoelectric catalysis (PEC) activities of porous Si/TiO 2 nanowire photoanodes were evaluated in degradation experiments of methylene blue under simulated solar light irradiation, and the sample at 6 h shows the highest PEC activity. Meanwhile, the PEC activity of the porous Si/TiO 2 nanowire photoanode is higher than that of the single direct photocatalysis process or electric catalysis. The mechanism of the PEC of the porous Si/TiO 2 nanowire photoanodes has been explained.

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A flux analysis of multiple junction solar cells: The general equations, with computations for an n-CdS/n-GaAs photoanode

Cited by 10 publications

References 23 publications

High Density n-Si/n-TiO₂Core/Shell Nanowire Arrays with Enhanced Photoactivity

High Density n-Si/n-TiO₂Core/Shell Nanowire Arrays with Enhanced Photoactivity

Photoelectrochemical Properties of Porous Si/TiO₂ Nanowire Heterojunction Structure

Porous Si/TiO₂ nanowire photoanode for photoelectric catalysis under simulated solar light irradiation

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A flux analysis of multiple junction solar cells: The general equations, with computations for an n-CdS/n-GaAs photoanode

Cited by 10 publications

References 23 publications

High Density n-Si/n-TiO2Core/Shell Nanowire Arrays with Enhanced Photoactivity

High Density n-Si/n-TiO2Core/Shell Nanowire Arrays with Enhanced Photoactivity

Photoelectrochemical Properties of Porous Si/TiO2 Nanowire Heterojunction Structure

Porous Si/TiO2 nanowire photoanode for photoelectric catalysis under simulated solar light irradiation

Contact Info

Product

Resources

About

High Density n-Si/n-TiO₂Core/Shell Nanowire Arrays with Enhanced Photoactivity

High Density n-Si/n-TiO₂Core/Shell Nanowire Arrays with Enhanced Photoactivity

Photoelectrochemical Properties of Porous Si/TiO₂ Nanowire Heterojunction Structure

Porous Si/TiO₂ nanowire photoanode for photoelectric catalysis under simulated solar light irradiation