Glass-glass encapsulation, low-iron tempered glass, and anti-reflective coatings improve light management, durability, and efficiency. This semi-transparent solar concentrator uses liquid crystal films to reflect and guide circularly polarized sunlight, enabling colorless energy harvesting for next-generation green buildings. Center for Liquid Crystal. . Cholesteric liquid crystal coatings enable transparent, unidirectional solar concentrators compatible with modern windows. We begin with a discussion of glass requirements, specifically composition, that enable. .