| 摘要 |
PURPOSE:To obtain a thin-film solar cell abounding with flexibility and having excellent optical conversion efficiency by using a specific biaxially oriented polyethylene-2,6-naththalene dicarboxylate film as a flexible substrate. CONSTITUTION:In a thin-film solar cell in which a photovoltage generating layer consisting of amorphous silicon is formed onto a flexible substrate, a biaxially oriented polyethylene-2,6-naphthalene dicarboxylate film 1, a thermal shrinkage factor thereof at 200 deg.C extends over 2.0% or less in all directions-that is, 1.355-1.390g/cm<3> density, is employed as said substrate. The PEN film having such characteristics can be acquired by thermally treating a film obtained through a normal manufacturing process. 210-250 deg.C, preferably, 230-245 deg.C, are used as the temperature of heat treatment, and several sec - several min are used as the treatment time. |
