Regensburg 2022 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 25: Poster 1

HL 25.49: Poster

Mittwoch, 7. September 2022, 18:00–20:00, P2

Temperature dependence of phonons of CuI — •R. Hildebrandt1, M. Seifert2, S. Botti2, C. Sturm1, and M. Grundmann11Universität Leipzig, Felix Bloch Institute for Solid State Physics, Germany — 2Fridrich-Schiller-Universität Jena, Institute of Condensed Matter Theory and Optics, Germany

Cuprous iodide (CuI) is unique as intrinsic transparent p-type semiconductor with high figure of merit regarding various optical and electrical properties [1]. Properties and processes like thermal conductivity, electron-phonon coupling, phonon scattering, phonon-decay and elastic constants are influenced or mediated by different types of phonons. Their characteristics will be investigated here by Raman scattering.

We present temperature dependent Raman scattering spectra for CuI by using a 532nm incident laser source on solution grown single crystals. The allowed TO and LO modes are observed as well as the weaker second order Raman spectrum, which contains the full information of CuI’s phonon dispersion [2]. It is used to determine the energy of the - usually forbidden - acustic and optic zone boundary phonons by modeling the two-phonon sum spectrum [3].

Up to about 170 K the temperature dependence of the acustic phonons could be tracked and compared with computational as well as other experimental results [3]. All results are in agreement and provide high accuracy information for the phonon dispersion of CuI.

[1] M. Grundmann et al., Phys. Stat. Sol. (a), 210, 1671, 2013.

[2] J. Birman, J., Phys. Rev., 131, 1489, 1963.

[3] Z. Vardeny et al., Phys. Rev. B, 18, 44876, 1978.

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