It is an object of the present invention to provide a polyester film for the protection of a back surface of a solar cell which, when applied to a silicon thin film solar cell, exhibits excellent durability even under high-temperature and high-humidity conditions and long term thermal stability.
A polyester film for the protection of a back surface of a solar cell containing a polyester, as a main constituent, obtained by polymerization using a polycondensation catalyst containing aluminum and/or its compound as well as a phosphorus compound having an aromatic group in the molecule; having a whiteness degree of 50 or higher; containing 3 to 50% by mass of fine particles with a mean particle diameter of 0.1 to 3 µm; and having an acid value from not lower than 1 (eq/ton) and not higher than 30 (eq/ton).
本发明的目的是提供一种用于保护太阳能电池背面的聚酯薄膜,这种薄膜在应用于
硅薄膜太阳能电池时,即使在高温高湿条件下也能表现出极佳的耐久性和长期热稳定性。
一种用于保护太阳能电池背面的聚酯薄膜,其主要成分为聚酯,该聚酯通过使用含铝和/或其化合物以及分子中含有芳香基的
磷化合物的缩聚催化剂聚合而成;白度为 50 或更高;含有 3 至 50%(按重量计)的细颗粒,其平均颗粒直径为 0.1 至 3 微米;酸值不低于 1(当量/吨),不高于 30(当量/吨)。