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

Abstract

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.