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All sourcesNASA NTRSDOE OSTI
DOE OSTI2020

Materials Data on SbSI by Materials Project

SbSI crystallizes in the orthorhombic Pnma space group. The structure is one-dimensional and consists of two SbSI ribbons oriented in the (1, 0, 0) direction. Sb3+ is bonded to three equivalent S2- and two equivalent I1- atoms to form edge-sharing SbS3I2 square pyramids. There are one shorter (2.49 Å) and two longer (2.73 Å) Sb–S bond lengths. Both Sb–I bond lengths are 3.13 Å. S2- is bonded in a 3-coordinate geometry to three equivalent Sb3+ atoms. I1- is bonded in a distorted L-shaped geometry to two equivalent Sb3+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on SbSI by Materials Project

SbSI crystallizes in the orthorhombic Pna2_1 space group. The structure is one-dimensional and consists of two SbSI ribbons oriented in the (1, 0, 0) direction. Sb3+ is bonded to three equivalent S2- and two equivalent I1- atoms to form edge-sharing SbS3I2 square pyramids. There are a spread of Sb–S bond distances ranging from 2.49–2.78 Å. There are one shorter (3.07 Å) and one longer (3.18 Å) Sb–I bond lengths. S2- is bonded in a 3-coordinate geometry to three equivalent Sb3+ atoms. I1- is bonded in a distorted L-shaped geometry to two equivalent Sb3+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on SbSI by Materials Project

SbSI crystallizes in the orthorhombic P2_12_12_1 space group. The structure is three-dimensional. Sb3+ is bonded in a 6-coordinate geometry to three equivalent S2- and three equivalent I1- atoms. There are one shorter (2.51 Å) and two longer (2.72 Å) Sb–S bond lengths. There are a spread of Sb–I bond distances ranging from 3.13–3.61 Å. S2- is bonded in a 3-coordinate geometry to three equivalent Sb3+ atoms. I1- is bonded in a 2-coordinate geometry to three equivalent Sb3+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2022

Charge carrier coupling to the soft phonon mode in a ferroelectric semiconductor

Many crystalline solids possess strongly anharmonic “soft” phonon modes characterized by diminishing frequency as temperature approaches a critical point associated with a symmetry breaking phase transition. While electron–soft phonon coupling can introduce unique scattering channels for charge carriers in ferroelectrics, recent studies on the nonferroelectric lead halide perovskites have also suggested the central role of anharmonic phonons bearing resemblance to soft modes in charge carrier screening. Here we apply coherent phonon spectroscopy to directly study electron coupling to the soft transverse optical phonon mode in a ferroelectric semiconductor SbSI. Photogenerated charge carriers in SbSI are found to be exceptionally long lived and are associated with a transient electro-optical effect that can be explained by interactions between charge carriers and thermally stimulated soft phonon excitations. Furthermore, these results provide strong evidence for the role of electron–soft phonon coupling in the efficient screening of charge carriers and in reducing charge recombination rates, both desirable properties for optoelectronics.

36 MATERIALS SCIENCE↗