Ferritic stainless steel foil for solar cell substrates

A technology of solar cells and stainless steel foils, applied in circuits, photovoltaic power generation, electrical components, etc., can solve the problems of deep drawing, breaking, wrinkling, etc., and achieve the effect of excellent passability and wrinkle suppression.

Active Publication Date: 2018-06-26
JFE STEEL CORP
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, even when a stainless steel foil having a predetermined strength (hardness) is used as a substrate, there is a problem that the substrate (stainless steel foil) is softened in the light-absorbing layer film-forming process, and the substrate (stainless steel foil) is softened in the subsequent manufacturing process. , buckling occurs on the substrate, which is prone to wrinkles, cracks or deep drawing, etc.
As a result, in the continuous process after the above-mentioned light-absorbing layer film-forming process, the generation of wrinkles and the like due to buckling of the stainless steel foil (substrate) cannot be avoided, and the productivity and photoelectric conversion efficiency of the solar cell are reduced.

Method used

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  • Ferritic stainless steel foil for solar cell substrates
  • Ferritic stainless steel foil for solar cell substrates

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Embodiment

[0106] For the solar cell substrate, when the solar cell unit is manufactured using the roll-to-roll method, it is required to have excellent heat resistance that can suppress the softening caused by the film formation process of the light-absorbing layer, and to have the ability to suppress the softening of the substrate afterward. Excellent plate passability in which wrinkles caused by buckling and the like appear. This is because in a continuous process such as the roll-to-roll method, if wrinkles or the like are generated on the substrate when passing the sheet, the productivity and photoelectric conversion efficiency of the solar cell will decrease.

[0107] Therefore, in view of the above-mentioned required characteristics, samples of stainless steel foil for solar cell substrates were produced, and various tests for evaluating the above-mentioned characteristics were implemented. The preparation method of the sample and various test / evaluation methods are as follows.

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Abstract

The present invention provides a ferritic stainless steel foil for a solar cell substrate. To provide a ferritic stainless steel foil for a solar cell substrate that can maintain sufficient hardness to suppress buckling and the like when passing through a sheet when producing a solar cell by a roll-to-roll method, and has excellent passability. Contains 14% to 18% of Cr by mass %, has a Vickers hardness of Hv250 or more, and forms a Vickers hardness of Hv250 after performing a film-forming treatment at a temperature range of 450°C to 600°C for 1 minute or more The above ferritic stainless steel foil for solar cell substrates.

Description

technical field [0001] The present invention relates to a ferritic stainless steel foil for solar cell substrate. In particular, the present invention relates to a solar cell excellent in threading performance capable of maintaining sufficient hardness to suppress buckling and the like when the solar cell is manufactured by a roll-to-roll method Substrate with ferritic stainless steel foil. Background technique [0002] In recent years, a power generation system utilizing sunlight as a new energy source has attracted attention. Crystalline Si solar cells using single crystal Si and polycrystalline Si as constituent layers are put into practical use, and such solar cells play an important role as a solar photovoltaic system for power supply. However, the production of crystalline Si solar cells requires a process of producing bulk crystals. Therefore, a large amount of raw materials is used, crystal growth takes a long time, and the manufacturing process is complicated and...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01L31/0749B21B1/40B21B3/02B21B45/00
CPCB21B1/40B21B37/74B21B45/004H01L31/03928B21B2045/006Y02E10/541H01L31/03926Y02P70/50B21B1/22B21B2001/221
Inventor 矢野孝宜石川伸山口裕弘有园智之
Owner JFE STEEL CORP
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