Scientists from Nanjing University developed a transparent, colorless solar concentrator coating for standard window glass using cholesteric liquid crystal multilayers. The coating redirected polarized sunlight toward the window edges where photovoltaic cells were installed. It maintained high visible transmittance of 64.2% and a color rendering index of 91.3 without altering window clarity. A prototype powered a 10-mW fan under sunlight, while modeling indicated a 2-meter-wide window could concentrate sunlight 50 times. The approach reduced photovoltaic cell requirements by up to 75% and supported integration with high-efficiency cells like gallium arsenide. The multilayer films were fabricated via photoalignment and polymerization and were scalable using roll-to-roll manufacturing. The design remained stable under long-term exposure and could be retrofitted onto existing windows. Future work focused on improving broadband efficiency, polarization control, and adapting the technology for greenhouses and transparent solar displays.