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Solar battery with Fresnel lens nano structure

A solar cell and Fresnel lens technology, which is applied in the field of solar cells to achieve the effects of increasing the absorption length, improving the effective absorption and reducing the reflectivity

Active Publication Date: 2015-05-27
ZHEJIANG UNIV
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  • Abstract
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  • Application Information

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Problems solved by technology

But the conversion efficiency limit of silicon solar cells is only 24%

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  • Solar battery with Fresnel lens nano structure
  • Solar battery with Fresnel lens nano structure
  • Solar battery with Fresnel lens nano structure

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Embodiment Construction

[0030] The present invention will be further described below in conjunction with drawings and embodiments.

[0031] Such as figure 1 As shown, the present invention forms a new solar cell by making a transmissive Fresnel lens on the upper surface of the solar cell, and the Fresnel lens is made of a series of concentric ring etching grooves, and the depth h of the etching groove is given by the formula h=λ / [2(n-1)] is calculated, so that the phase difference of the incident light propagating from the upper surface of the Fresnel lens etching groove to the lower surface is π, where λ is the central wavelength of the incident light, and n is The refractive index of the Fresnel lens material on the surface of the solar cell; the radius of the concentric ring etching groove is designed according to the Huygens-Fresnel principle and calculated by the Fresnel band method.

[0032] The depth of the etched groove is a quarter of the central wavelength of the incident light, so that th...

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Abstract

The invention discloses a solar battery with a Fresnel lens nano structure. A Fresnel lens is manufactured on the surface of the solar battery; the Fresnel lens consists of a series of concentric annulus etching grooves; the depth of each etching groove is calculated according to the equation as shown in the specification, so that the phase difference of incident light transmitted to the lower surface from the upper surface of the Fresnel lens is phi, in the equation, lambda is the central wave length of the incident light, and n is the refractive index of the material of the Fresnel lens on the surface of the solar battery; the width and the interval of the etching grooves are designed according to the Huygens-Fresnel principle, and are calculated by using a Fresnel wave band method. As the Fresnel lens is integrated with the solar battery, a high-performance, small-size and high-efficiency photovoltaic system is achieved, the reflectivity of the surface of the solar battery is effectively reduced, the absorbing length of photon on a PN junction area of the solar battery is effectively prolonged, the light field strength of the incident light in the PN junction area of the solar battery is effectively improved, and the effective absorption of the photon in the PN junction area of the solar battery is improved.

Description

technical field [0001] The invention relates to a solar cell, in particular to a solar cell with a Fresnel lens nanostructure. Background technique [0002] Solar photovoltaic power generation is a very environmentally friendly way of generating electricity. After nearly a century of development, photovoltaic energy is gradually becoming one of the most concerned new energy sources in the world, and it is also gradually becoming one of the most dynamic research fields. At present, the mainstream solar cells on the market are silicon solar cells. But the conversion efficiency limit of silicon solar cells is only 24%. In order to achieve higher conversion efficiency, gallium arsenide is used to make solar cells. The theoretical limit for single-junction GaAs solar cells is about 27%. The conversion efficiency of the three-junction gallium arsenide solar cell made in the laboratory even reached more than 40%. [0003] Gallium arsenide belongs to the group III-V compound se...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L31/054H01L31/18
CPCH01L31/18Y02E10/52Y02P70/50
Inventor 柳楠胡昱何建军
Owner ZHEJIANG UNIV
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