Applying Texturization Methods for Luminescent Down‐Shifting Films to Enhance the Light Absorption in High‐Efficiency Photovoltaic Devices

Photon management offers a promising strategy to mitigate optical losses and improve the efficiency of photovoltaic devices. In most down‐shifting studies, the isotropic emission of down‐shifting materials limits the photon utilization. Herein, we combine inverted‐pyramid texturization with luminescent down‐shifting films to minimize broadband reflection of photovoltaic devices and enhance the utilization of down‐shifted photons. The textured architecture increases the energy transfer efficiency of down‐shifted photons to 1.3 times that of a flat down‐shifting film. For silicon solar cells, the textured down‐shifting film yields a total integrated photocurrent enhancement of 2.3% over its flat counterpart. Of this improvement, 0.2% is attributed to the enhanced redirection of down‐shifted photons toward the solar cell in the UV region (300–400 nm), while 2.1% originates from broadband light‐trapping effect across the full spectrum (400–1180 nm), resulting in a relative efficiency gain of 2.0%. The same strategy is further extended to wide‐bandgap perovskite solar cells, delivering a relative efficiency improvement of 2.3% with respect to bare devices, demonstrating the applicability of this optical management approach beyond silicon‐based technologies. This work provides insights into the underlying physical phenomena of textured luminescent down‐shifting film and optimal design considerations for encapsulation materials in high‐performance photovoltaic devices.