Ultrafast Photoconductivity and Terahertz Vibrational Dynamics in Double‐Helix SnIP Nanowires

Photoconductivity Helix (gastropod) Dynamics
DOI: 10.1002/adma.202100978 Publication Date: 2021-07-19T07:20:56Z
ABSTRACT
Tin iodide phosphide (SnIP), an inorganic double-helix material, is a quasi-1D van der Waals semiconductor that shows promise in photocatalysis and flexible electronics. However, our understanding of the fundamental photophysics charge transport dynamics this new material limited. Here, we use time-resolved terahertz (THz) spectroscopy to probe transient photoconductivity SnIP nanowire films and, with insight into highly anisotropic electronic structure from quantum chemical calculations, measure electron mobility as high 280 $cm^2V^{-1}s^{-1}$. Additionally, THz vibrational spectrum reveals photoexcitation-induced redistribution reduces amplitude twisting mode outer SnI helix on picosecond timescales. Finally, show carrier lifetime are limited by trap density greater than $10^{18}\,cm^{-3}$. Our results provide optical excitation relaxation pathways demonstrate remarkably for such soft material.
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