POLYIMIDE LAYER-CONTAINING FLEXIBLE SUBSTRATE, POLYIMIDE LAYER-CONTAINING SUBSTRATE FOR FLEXIBLE SOLAR CELL, FLEXIBLE SOLAR CELL, AND METHOD FOR PRODUCING SAME
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Abstract
A flexible substrate has heat resistance to endure the high temperature such as sintering of a photovoltaic conversion layer of a compound-type thin film solar cell, can prevent permeation and/or diffusion of metal into the photovoltaic conversion layer, and can be used for many applications. The polyimide layer-containing flexible substrate has a metal substrate of metal foil made of ordinary steel or stainless steel having a coefficient of thermal expansion in a plane direction of not more than 15 ppm/K, or a metal substrate of metal foil made of that ordinary steel or stainless steel on the surface of which a metal layer comprising one of copper, nickel, zinc, or aluminum or an alloy layer of the same is provided, over which a polyimide layer having a layer thickness of 1.5 to 100 μm and a glass transition point temperature of 300 to 450° C. is formed.
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Citations
36 Claims
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1-15. -15. (canceled)
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16. A polyimide layer-containing flexible substrate comprising:
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a metal substrate of metal foil made of ordinary steel or stainless steel having a coefficient of thermal expansion in a plane direction of not more than 15 ppm/K and a polyimide layer which is formed on the metal substrate, has a layer thickness of 1.5 to 100 μ
m, and has a glass transition point temperature of 300 to 450°
C. - View Dependent Claims (19, 20, 21, 22, 23, 24, 25, 31, 32, 33, 34, 35, 36)
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17. A polyimide layer-containing flexible substrate comprising:
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a metal substrate of metal foil made of ordinary steel or stainless steel having a coefficient of thermal expansion in a plane direction of not more than 15 ppm/K on the surface of which a metal layer comprising one of copper, nickel, zinc, or aluminum or an alloy layer of the same is provided and a polyimide layer which is formed on the metal layer or the alloy layer, has a layer thickness of 1.5 to 100 μ
m, and has a glass transition point temperature of 300 to 450°
C. - View Dependent Claims (18)
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26. A method of production of a polyimide layer-containing flexible substrate comprising:
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a step of coating a polyimide precursor solution on a metal substrate of metal foil made of ordinary steel or stainless steel having a coefficient of thermal expansion in a plane direction of not more than 15 ppm/K and a step of heat treating the polyimide precursor solution to cure it by drying and imidization and forming a polyimide layer having a layer thickness of 1.5 to 100 μ
m and having a glass transition point temperature of 300 to 450°
C. - View Dependent Claims (29, 30)
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27. A method of production of a polyimide layer-containing flexible substrate comprising:
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a step of forming on the surface of metal foil made of ordinary steel or stainless steel having a coefficient of thermal expansion in a plane direction of not more than 15 ppm/K a metal layer comprising one of copper, nickel, zinc, or aluminum or an alloy layer of the same to form a metal substrate, a step of coating a polyimide precursor solution on the metal layer or the alloy layer of the same, and a step of heat treating the polyimide precursor solution to cause curing by drying and imidization and thereby to form a polyimide layer having a layer thickness of 1.5 to 100 μ
m and glass transition point temperature of 300 to 450°
C. - View Dependent Claims (28)
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Specification