Facing the severe challenges of the “dual carbon” goals and global warming, energy‐saving windows have become one of the research cores for reducing operational carbon emissions in green buildings. The application of the light‐selective absorption of antimony‐doped tin oxide (ATO) is a research hotspot. To address the issues of poor near‐infrared (NIR) absorption efficiency and photothermal conversion of ATO. Here, copper vacancy self‐doped Cu 2‐x S is introduced and grafted on ATO with tannic acid (TA) to synthesize Cu 1.95 S‐TA‐ATO. The hole carriers in Cu 1.95 S exhibit localized surface plasmon resonance under NIR excitation, expanding absorption and enhancing photothermal conversion. Notably, TA as the bridging agent maintains the superior properties of both materials through grafting and achieves synergistic superposition. The resulting Cu 1.95 S‐TA‐ATO solution demonstrates a photothermal conversion efficiency of up to 44% under 808 nm laser irradiation. The corresponding membrane displays a visible light transmittance of 61.12%, with markedly improved NIR absorption between 780 and 1200 nm compared to pure ATO membrane. The maximum temperature difference achieved during photothermal conversion reaches 32.7°C, and the solar absorption rate across the 780–2000 nm range is enhanced by 25.63%. Furthermore, the integration of the Cu 1.95 S‐TA‐ATO membrane at the thermal source end of the Seebeck module enables a stable voltage output of 0.097 V, demonstrating its potential for practical energy applications.
Lin et al. (Sun,) studied this question.