Highly mobile hot holes in Cs₂AgBiBr₆ double perovskite.

ABSTRACT: Highly mobile hot charge carriers are a prerequisite for efficient hot carrier optoelectronics requiring long-range hot carrier transport. However, hot carriers are typically much less mobile than cold ones because of carrier-phonon scattering. Here, we report enhanced hot carrier mobility in Cs₂AgBiBr₆ double perovskite. Following photoexcitation, hot carriers generated with excess energy exhibit boosted mobility, reaching an up to fourfold enhancement compared to cold carriers and a long-range hot carrier transport length beyond 200 nm. By optical pump–infrared push-terahertz probe spectroscopy and frequency-resolved photoconductivity measurements, we provide evidence that the conductivity enhancement originates primarily from hot holes with reduced momentum scatter

SUBMITTER: Zhang H 

PROVIDER: S-EPMC8694595 | biostudies-literature | 2021 Dec

REPOSITORIES: biostudies-literature