TY - JOUR
T1 - Phonon-Mediated Slow Hot Carrier Dynamics in Lead-Free Cs3Bi2I9 Perovskite Single Crystal
AU - Tailor, Naveen Kumar
AU - Maity, Partha
AU - Satapathi, Soumitra
N1 - KAUST Repository Item: Exported on 2022-06-10
Acknowledgements: N.K.T. acknowledges a UGC Fellowship. S.S. would like to acknowledge a SERB grant (IPA/2021/000096).
PY - 2022/6/8
Y1 - 2022/6/8
N2 - In this report, we study the hot carrier cooling mechanism of the Cs3Bi2I9 single crystal by using femtosecond transient reflectance (fs-TR) spectroscopy. We find an unusual slow hot carrier cooling associated with longitudinal optical (LO) and coherent longitudinal acoustic phonons (CLAPs) emission during the deexcitation of the hot carriers. We posit the interplay between the hot-carriers and the LO and CLA phonons in subpicosecond to subnanosecond time scales, respectively, by analyzing the TR kinetics upon perturbation with excess energy. Furthermore, we measured the CLAPs propagation velocity in Cs3Bi2I9, the crystal, ranging from 1820 to 2000 ms–1. The elastic constants and frequency of Brillouin oscillations were estimated as 20.08 GPa and 14.66 GHz, respectively. Our discovery delivers new physical insights into how the hot carriers in Cs3Bi2I9 single crystal are coupled with a crystal lattice that controls the hot carrier dynamics.
AB - In this report, we study the hot carrier cooling mechanism of the Cs3Bi2I9 single crystal by using femtosecond transient reflectance (fs-TR) spectroscopy. We find an unusual slow hot carrier cooling associated with longitudinal optical (LO) and coherent longitudinal acoustic phonons (CLAPs) emission during the deexcitation of the hot carriers. We posit the interplay between the hot-carriers and the LO and CLA phonons in subpicosecond to subnanosecond time scales, respectively, by analyzing the TR kinetics upon perturbation with excess energy. Furthermore, we measured the CLAPs propagation velocity in Cs3Bi2I9, the crystal, ranging from 1820 to 2000 ms–1. The elastic constants and frequency of Brillouin oscillations were estimated as 20.08 GPa and 14.66 GHz, respectively. Our discovery delivers new physical insights into how the hot carriers in Cs3Bi2I9 single crystal are coupled with a crystal lattice that controls the hot carrier dynamics.
UR - http://hdl.handle.net/10754/678833
UR - https://pubs.acs.org/doi/10.1021/acs.jpclett.2c01369
U2 - 10.1021/acs.jpclett.2c01369
DO - 10.1021/acs.jpclett.2c01369
M3 - Article
C2 - 35674417
SN - 1948-7185
JO - The Journal of Physical Chemistry Letters
JF - The Journal of Physical Chemistry Letters
ER -