Hot-Electron Extraction from Perovskite Quantum Dots for Photovoltage Enhancement

作者：Yifan Chen, Wei Qi, Jianhui Fu, Shuyi Lin, Hui Ren, Qi Liu, Luwei Zhou, Jun Yin, Mingjie Li · 发表于：ACS Energy Letters · 年份：2025 · DOI：10.1021/acsenergylett.5c02578 · 被引用次数：4 · 研究领域：Perovskite Materials and Applications、Quantum Dots Synthesis And Properties、ZnO doping and properties

Rapid energy loss from hot-carrier relaxation above the bandgap limits optoelectronic efficiency. A key unmet challenge for hot-carrier utilization is developing practical systems that combine long hot-carrier lifetimes in absorbers with efficient extraction in devices. Here, we fabricate CsPb 1– x Sn x I 3 perovskite quantum dots (QDs) with long hot-carrier lifetimes under low pump intensity─critical for real applications. We also design Cs-doped TiO 2 nanorod arrays as hot-carrier high-pass filters; their tuned band structure enables around 82% hot-electron extraction from surface-sensitized QDs, confirmed by visible/near-IR transient absorption and supported by DFT/NAMD calculations. Proof-of-concept hot-carrier solar cells based on these QDs-sensitized nanorod arrays show a 12% open-circuit voltage increase (up to 1.13 eV) vs normal cells, attributed to hot-carrier photocurrent (73% quantum efficiency at 400 nm vs 600 nm). Hot-carrier thermionic emission modeling validates results, providing a promising platform for photovoltaics beyond the Shockley–Queisser limit.