Color Tuning and Efficiency Enhancement of Transparent c-Si Solar Cells with Ag/TiO₂ Double Layer

Transparent solar cells maximize installation space by being applicable to glass areas such as building windows and sunroofs, necessitating high power conversion efficiency (PCE), long-term stability, and aesthetic appeal. This study demonstrates the development of transparent crystalline silicon (c-Si) solar cells that exhibit vivid colors, enhanced PCE, and long-term stability. To achieve vivid coloration, a metal-oxide-based color filter with a single metal layer and TiO₂ thin films, which show high transmittance, is integrated into the neutral-colored transparent c-Si solar cells. As a result, the proposed all-inorganic-based transparent solar cells exhibited red, green, and blue colors, achieved a high PCE of 15.3%, and demonstrated long-term stability for up to 1000 h by leveraging c-Si solar cells in conjunction with all inorganic color filters.