Polyimide layer-containing flexible substrate, polyimide layer-containing flexible solar cell substrate, flexible solar cell, and production method thereof

摘要

Flexible that can be used for various purposes, has heat resistance that can withstand high temperatures like sintering of photoelectric conversion layers of compound thin film solar cells, and can prevent penetration and diffusion of metal into photoelectric conversion layers Providing a substrate. One type of copper, nickel, zinc, or aluminum on the surface of a metal substrate made of ordinary steel or stainless steel having a coefficient of thermal expansion of 15 ppm / K or less in the surface direction, or on the surface of the metal foil made of ordinary steel or stainless steel A polyimide layer-containing flexible substrate in which a polyimide layer having a layer thickness of 1.5 to 100 μm and a glass transition temperature of 300 to 450 ° C. is formed on a metal substrate having a metal layer comprising these or an alloy layer thereof; To do.