Product Describtion: We are committed to bringing you Greener Alternative Products, which adhere to one or more of The 12 Principles of Greener Chemistry. This product has been enhanced for energy efficiency. Product Application: Copper(I) selenide (Cu2Se) is a semiconductor material, which exists in cubic, tetragonal or orthorhombic forms. It forms thin films, which can be used as solar cell materials, optical filters, thermoelectric converters, electro-optical devices, and microwave shield coatings.