Condensed Matter Seminars

Special Seminar
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https://virginia.zoom.us/j/92287909487
Meeting ID: 922 8790 9487
Password: HEPseminar

Wednesday, November 4, 2020
10:00 AM
Online, Room via Zoom
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"Crystal structure, rotational dynamics and vibrational dynamics of a two-dimensional perovskite"


Xiao Hu , University of Virginia - Department of Physics
[Host: Seung-Hun Lee]
ABSTRACT:

Metal halide perovskites (MHPs) have come to the forefront in the photovoltaic and light-emitting devices due to their attractive optoelectronic properties, such as tunable bandgaps, long charge carrier lifetime, and bright luminescence. The interactions between charge carriers and crystal lattice, such as electron-phonon coupling, polaron formation and low thermal conductivity, are proposed to be the major reasons for their extraordinary device performance. Our previous studies have demonstrated the significant role of the organic cation mobility in screening the excited charge carriers and further extending the charge carrier lifetime in three-dimensional (3D) perovskites. Compared with 3D perovskites, however, 2D perovskites exhibit a one-order-of-magnitude longer degradation time and some of them could have extremely high photoluminescence quantum yields, which make them popular in the LED field. This talk will summarize the experimental investigations on a 2D MHP and examine the relationships between the lattice dynamics and optoelectronic properties in this type of 2D perovskites.

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