• • Achieved full-spectrum color tunability covering the entire CIE standard color gamut on both device surfaces by adjusting Ag/TeO2 layer thicknesses, enabling architectural harmony without sacrificing efficiency.
• • Devices exhibit neutral transparency with average visible transmittance (AVT) ranging from 16.6% to 27.0%, and power conversion efficiencies (PCE) between 8.1% and 9.2%, balancing aesthetics and performance.
• • The double-sided ultra-thin Ag/TeO2 transparent electrodes enable bidirectional reflected color control, a critical feature for building-integrated photovoltaics where both exterior and interior aesthetics matter.
• • Demonstrated flexibility-adaptive coloration and curvature-enhanced aesthetics, indicating suitability for curved or flexible surfaces in vehicle and building integration, expanding application scenarios.