Color Tuning and Efficiency Enhancement of Transparent c ‐Si Solar Cells with Ag/TiO ₂ Double Layer

Abstract 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 TiO ₂ 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.