Photothermally Enhanced Photoresponse of Bismuth Halide Perovskite by Phonon Scattering Photothermally Enhanced Photoresponse of Bismuth Halide Perovskite by Phonon Scattering AITranslate

Basic Information:

DOI：https://doi.org/10.1021/acsaelm.1c00963

Chinese Library Classification Number:

Citation Information:

Controlling the thermal conductivity of metal halide perovskites is of significance to promising applications ranging from optoelectronic devices to heat storage and conversion devices. Herein, we carry out the thermal management of bismuth halide perovskite. As measured by time-domain thermo-reflectance, the Cs3Bi2I9 thin film possesses a thermal conductivity of 0.15 W m–1 K–1 that is lower than that of the BiI3 thin film with a thermal conductivity of 0.31 W m–1 K–1. We attribute the differential thermal conductivity to the stronger phonon scattering of Cs3Bi2I9 at low frequencies as compared to that of BiI3. In addition, we fabricated photothermal detectors by employing BiI3 and Cs3Bi2I9 thin films with different heat transport characteristics. As a result, the detectors using Cs3Bi2I9 have a larger response temperature, stronger photocurrent, higher responsivity, and normalized detectivity than the detectors using BiI3. The unique heat transport characteristics provide a prospect for photothermal detection. Furthermore, the insights in this report imply opportunities to explore ultra-low thermal conductivity among metal halide perovskites.