Manipulation of Hot Carrier Cooling Dynamics in Two-Dimensional Dion-Jacobson Hybrid Perovskites via Rashba Band Splitting

by J. Yin, R. Naphade, P. Maity, L. Gutierrez-Arzaluz, D. Almalawi, I. S. Roqan, J-L. Bredas, O. M. Bakr, O. F. Mohammed
Year: 2021 DOI: 10.1038/s41467-021-24258-7 / Nature Communications, 12, 3995 (2021)


Nature Communications, 12, 3995 (2021)


Hot-carrier cooling processes of perovskite materials are typically described by a single parabolic band model that includes the effects of carrier-phonon scattering, hot phonon bottleneck, and Auger heating. However, little is known (if anything) about the cooling processes in which the spin-degenerate parabolic band splits into two spin-polarized bands, i.e., the Rashba band splitting effect. Here, we investigated the hot-carrier cooling processes for two slightly different compositions of two-dimensional Dion–Jacobson hybrid perovskites, namely, (3AMP)PbI4 and (4AMP)PbI4 (3AMP = 3-(aminomethyl)piperidinium; 4AMP = 4-(aminomethyl)piperidinium), using a combination of ultrafast transient absorption spectroscopy and first-principles calculations. In (4AMP)PbI4, upon Rashba band splitting, the spin-dependent scattering of hot electrons is responsible for accelerating hot-carrier cooling at longer delays. Importantly, the hot-carrier cooling of (4AMP)PbI4 can be extended by manipulating the spin state of the hot carriers. Our findings suggest a new approach for prolonging hot-carrier cooling in hybrid perovskites, which is conducive to further improving the performance of hot-carrier-based optoelectronic and spintronic devices.

DOI: 10.1038/s41467-021-24258-7



Two-dimensional hybrid perovskites