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Solar cell and solar cell device

A technology of solar cells and transparent electrodes, applied in circuits, photovoltaic power generation, electrical components, etc., can solve problems such as inability to improve energy conversion efficiency, difficulties, light attenuation, etc.

Inactive Publication Date: 2012-05-23
HITACHI ZOSEN CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] However, in semiconductors using crystals such as silicon, including compound semiconductors, the band gap is fixed depending on the selection of elements, and it is difficult to obtain an arbitrary band gap, so the energy conversion efficiency cannot be improved.
In addition, in the case of the tandem type and the multi-layer overlapping type, since the upper solar cells absorb and scatter sunlight, the light required by the lower solar cells is attenuated.

Method used

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  • Solar cell and solar cell device
  • Solar cell and solar cell device
  • Solar cell and solar cell device

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0063] Hereinafter, a solar cell according to Embodiment 1 (corresponding to Claim 1 and Claim 2) of the present invention will be described.

[0064] like Figure 4 As shown, the solar cell 21 includes: a transparent electrode 22 formed as an n-type semiconductor (such as using an FTO electrode); a plurality of carbon nanotubes 23 are arranged side by side on the lower surface (surface) of the transparent electrode 22 and are connected to the transparent electrode 22. The lower surface is vertical; and the metal electrode 24 as an opposing electrode is disposed on the lower surface (surface) of each of the carbon nanotubes 23 opposite to the transparent electrode 22 . The diameters of the parallel carbon nanotubes 23 are changed stepwise from one side to the other, and each of the carbon nanotubes 23 is doped with atoms of group III of the periodic table to form a p-type semiconductor.

[0065] A method for manufacturing the solar cell 21 will be described below.

[0066] F...

Embodiment 2

[0077] Hereinafter, a solar cell according to Embodiment 2 (corresponding to claim 2) of the present invention will be described.

[0078] like Figure 5 As shown, the solar cell 31 includes: made of silicon dioxide (SiO 2 ) formed transparent substrate 32; transparent electrode 33 (such as using FTO electrode), configured on the lower surface (surface) of the transparent substrate 32 and formed as an n-type semiconductor; a plurality of carbon nanotubes 34, arranged side by side on the transparent The lower surface (surface) of the electrode 33 is perpendicular to the lower surface; and the metal electrode 35 as an opposing electrode is arranged on the lower surface (surface) of each of the carbon nanotubes 34 opposite to the transparent electrode 33 . The diameter of the carbon nanotubes 34 arranged side by side is changed stepwise from one side to the other side, for example, it is gradually thinned, and each of the carbon nanotubes 34 is doped with the third group of the ...

Embodiment 3

[0089] Hereinafter, a solar cell according to Embodiment 3 (corresponding to claim 3) of the present invention will be described.

[0090] like Image 6 As shown, the solar cell 41 includes: made of silicon dioxide (SiO 2 ) formed transparent substrate 42; transparent electrode 43 (such as using FTO electrode), configured on the lower surface (surface) of the transparent substrate 42 and formed as an n-type semiconductor; a plurality of carbon nanotubes 44, arranged side by side on the transparent The lower surface (surface) of the electrode 43 is perpendicular to the surface; and the metal electrode 45 as an opposing electrode is arranged on the lower surface (surface) of each of the carbon nanotubes 44 opposite to the transparent electrode 43 . Doping the atoms of the fifth group of the periodic table in the transparent electrode side part 44a of each of the carbon nanotubes 44 to form an n-type semiconductor, and doping the third group atoms of the periodic table in the me...

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Abstract

Disclosed is a solar cell which is provided with: a transparent electrode (2) formed as an n-type semiconductor; a plurality of carbon nanotubes (3), which are disposed parallel to each other and perpendicular to the lower surface of the transparent electrode (2), on the lower surface of the transparent electrode; and metal electrodes (4) disposed on the lower surfaces of the carbon nanotubes (3), said lower surfaces being on the reverse side of the transparent electrode (2). The diameters of the carbon nanotubes (3) disposed parallel to each other are gradually changed from one side toward the other side, and each of the carbon nanotubes (3) is formed as a p-type semiconductor by being doped with group III atoms.

Description

technical field [0001] The present invention relates to a solar cell using carbon nanotubes and a solar cell device using the same. Background technique [0002] Solar cells are mainly composed of monocrystalline, polycrystalline, and amorphous silicon, and are widely used in residential buildings and factories, but their disadvantage is low energy conversion efficiency. One of the reasons for the low energy conversion efficiency is as follows: a general solar cell has only one band gap, and long-wave light with energy smaller than the band gap cannot be photoelectrically converted, while short-wave light with energy exceeding the band gap has only a part of the band gap. Energy can be photoelectrically converted. [0003] In response to the above disadvantages, a solar cell having two or more different band gaps has been disclosed (for example, refer to Japanese Patent Laid-Open Publication No. 2003-197930). [0004] As described above, in order to improve the energy conv...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L31/04C01B31/02
CPCH01L31/035281Y02E10/52H01L31/0352H01L31/0528Y02E10/50H01L31/035227H01L31/0524H01L31/0543H01L31/0549C01B32/158H01L31/042
Inventor 平冈和志杉本巖生滝谷俊夫高锅浩二
Owner HITACHI ZOSEN CORP