Basic properties of the spheral solar cell

Levine, Judah; Hotchkiss, G. B.; Hammerbacher, M.D.

doi:10.1109/pvsc.1991.169370

Cited by 21 publications

(14 citation statements)

References 3 publications

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“…First, the spherical topology would allow an omnidirectional light harvesting 15 . Second, in addition to an enhanced photocurrent response above and near the band gap edge, as reported for nanowire devices [7][8][9][10][11] , the strong confinement effect appearing in high-Q optical resonances would allow IR light dwelling for a time long enough to be absorbed even beyond the absorption edge of silicon.…”

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confidence: 99%

All-silicon spherical-Mie-resonator photodiode with spectral response in the infrared region

et al. 2014

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Silicon is the material of choice for visible light photodetection and solar cell fabrication. However, due to the intrinsic band gap properties of silicon, most infrared photons are energetically useless. Here, we show the first example of a photodiode developed on a micrometre scale sphere made of polycrystalline silicon whose photocurrent shows the Mie modes of a classical spherical resonator. The long dwell time of resonating photons enhances the photocurrent response, extending it into the infrared region well beyond the absorption edge of bulk silicon. It opens the door for developing solar cells and photodetectors that may harvest infrared light more efficiently than silicon photovoltaic devices that are so far developed.

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confidence: 99%

All-silicon spherical-Mie-resonator photodiode with spectral response in the infrared region

et al. 2014

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“…Many efforts for the cost reduction have been made by the reduction of Si wafer thicknesses, i.e., Si material volume per watt. From the viewpoint of cost reduction, spherical Si solar cells attract considerable attention [1][2][3][4][5][6][7] because of the promising feature of low-waste and low-cost fabrication. Furthermore, to achieve performance comparable to that of crystalline-Si wafer-based solar cells, we proposed a new type of a spherical Si solar cell combined with a reflector cup as shown in Fig.…”

Section: Introductionmentioning

confidence: 99%

Fabrication of Spherical Silicon Crystals by Dropping Method and Their Application to Solar Cells

Minemoto

Takakura

2007

jjap

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Spherical Si crystals for solar cell substrates have been successfully fabricated by a dropping method. In the dropping method, melted Si droplets were instilled at normal pressure or in the decompression state (0.5 atm) to control the cooling rate of the spherical Si, dominating crystal quality parameters such as dislocation density in crystal grains. Differences in the crystal quality of the spherical Si crystals were analyzed by surface observation with scanning electron microscopy after Dash etching. Through our baseline process, spherical Si solar cells were fabricated using spherical Si crystals with a diameter of 1 mm fabricated in the decompression state. The current-voltage measurement of the solar cell showed an energy conversion efficiency of 11.1% (short-circuit current density: 24.7 mA/cm 2 , open-circuit voltage: 601 mV, fill factor: 74.6%). These results indicated that spherical Si crystals fabricated by the dropping method have a great potential for the substrate material of high-efficiency and low-cost solar cells.

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“…Many efforts for the cost reduction have been made through the reduction of Si wafer thicknesses, i.e., Si material volume per watt, because approximately 45% of the overall costs of the c-Si solar cell modules are related to the fabrication of Si wafers. From the viewpoint of cost reduction, spherical Si solar cells attract considerable attention [2][3][4][5][6] because of the expected feature of low-waste and low-cost fabrication. Furthermore, to achieve comparable performance to c-Si wafer-based solar cells, we proposed the new type of a spherical Si solar cell combined with a reflector cup, i.e., the spherical Si solar cell with a semilight-concentration system.…”

Section: Introductionmentioning

confidence: 99%

Fabrication of Spherical Silicon Solar Cells with Semi-Light-Concentration System

Minemoto

Okamoto

Omae

et al. 2005

Jpn. J. Appl. Phys.

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A spherical Si solar cell with a semi-light-concentration system was successfully fabricated using a spherical Si crystal produced by a dropping method. The dropping method has great potential for low-waste and low-cost fabrication because the Si spheres can be made directly from dropping melted Si without the cutting and polishing processes of Si ingots. The fabricated Si spheres were generally multicrystalline due to the crystal growth through homogeneous crystal nucleation in containerless states. Spherical Si solar cells were fabricated using a Si sphere with a diameter of 1 mm as a solar cell substrate and then mounted on a reflector cup with a hexagonal aperture to complete the semi-light-concentration system. The current–voltage (J–V) measurement of the cell demonstrated an energy conversion efficiency of 10.4%. The key parameters for achieving higher efficiency are discussed with J–V data analysis, and quantum efficiency and laser-beam-induced current measurements.

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Basic properties of the spheral solar cell

Cited by 21 publications

References 3 publications

All-silicon spherical-Mie-resonator photodiode with spectral response in the infrared region

All-silicon spherical-Mie-resonator photodiode with spectral response in the infrared region

Fabrication of Spherical Silicon Crystals by Dropping Method and Their Application to Solar Cells

Fabrication of Spherical Silicon Solar Cells with Semi-Light-Concentration System

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