The study reports a Cu/Cu₂Se-Cu₂O heterojunction-nanosheet array (Cu-CSCO HNA) for efficient photothermal conversion of CO₂ to ethanol under visible-near-infrared light without external heating. The Z-scheme Cu₂Se-Cu₂O heterostructure provides spatially separated sites for CO₂ reduction and water oxidation, enhancing carrier transport efficiency. The microreactors induced by Cu₂Se nanosheets improve the local concentration of intermediates (CH₃⁺ and CO⁺), promoting C-C coupling. The photothermal effect of Cu₂Se nanosheets raises the system's temperature to around 200 °C. The Cu-CSCO HNA achieves an ethanol generation rate of 149.45 μmol g⁻¹ h⁻¹, with an electron selectivity of 48.75% and an apparent quantum yield of 0.286%. This work demonstrates the potential of photothermal catalysts for converting CO₂ into multi-carbon chemicals using solar energy.The study reports a Cu/Cu₂Se-Cu₂O heterojunction-nanosheet array (Cu-CSCO HNA) for efficient photothermal conversion of CO₂ to ethanol under visible-near-infrared light without external heating. The Z-scheme Cu₂Se-Cu₂O heterostructure provides spatially separated sites for CO₂ reduction and water oxidation, enhancing carrier transport efficiency. The microreactors induced by Cu₂Se nanosheets improve the local concentration of intermediates (CH₃⁺ and CO⁺), promoting C-C coupling. The photothermal effect of Cu₂Se nanosheets raises the system's temperature to around 200 °C. The Cu-CSCO HNA achieves an ethanol generation rate of 149.45 μmol g⁻¹ h⁻¹, with an electron selectivity of 48.75% and an apparent quantum yield of 0.286%. This work demonstrates the potential of photothermal catalysts for converting CO₂ into multi-carbon chemicals using solar energy.