Core Viewpoint - Foster (603806.SH) is the world's largest supplier of optical conversion films, which enhance the power generation of photovoltaic modules by converting ultraviolet light into visible light [1] Group 1: Company Overview - The company specializes in optical conversion films that are widely used in various types of photovoltaic components, including HJT, BC, perovskite, and perovskite tandem modules [1] - Currently, the optical conversion films are predominantly applied in HJT components, while their use in perovskite components is still in the trial phase due to ongoing technological development [1] Group 2: Industry Position - As a leading global enterprise in photovoltaic adhesive films, the company collaborates extensively with various types of component customers worldwide, providing a wide range of film products [1]