Photogenerated carrier behavior at a gas-solid interface for CO₂ adsorption on Cs₂AgBiBr₆ nanocrystals

Photogenerated carrier behavior at a CO₂/Cs₂AgBiBr₆ quantum dot (QD) interface is investigated. In situ photovoltage spectra reveal electron transfer from the Cs₂AgBiBr₆ QDs to CO₂. Moreover, this carrier transfer prefers Bi³⁺ sites (over Ca⁺ and Ag⁺ sites) due to them exhibiting the lowest adsorption energy (E_ads = -0.125 eV) and CO₂-Bi³⁺ interactions being more stable.