Journal Article

FZJ-2021-00711

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Phonon Spectra of Strongly Luminescent Nonstoichiometric Ag–In–S, Cu–In–S, and Hg–In–S Nanocrystals of Small Size

Dzhagan, V. (Corresponding author) ; Selyshchev, O. ; Raievska, O. ; Stroyuk, O.FZJ* ; Hertling, L. ; Mazur, N. ; Valakh, M. Y. ; Zahn, D. R. T.

2020
Soc. Washington, DC

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Please use a persistent id in citations: http://hdl.handle.net/2128/27415  doi:10.1021/acs.jpcc.0c03268

Abstract: We present a detailed analysis of Raman and infrared (IR) phonon spectra of strongly luminescent non-stoichiometric M-In-S (M = Cu, Ag, Hg) and core/shell M-In-S/ZnS nanocrystals (NCs) of small size (d  2-4 nm), formed by means of aqueous colloidal chemistry under mild conditions. Despite presumably similar factors determining position and broadening of the Raman and X-ray diffraction (XRD) peaks, phonon spectra are shown to be more sensitive to NC composition and crystals structure. The spectral Raman pattern of these strongly M-deficient M-In-S NCs is different from that of the corresponding stoichiometric phases, e.g. CuInS2 or AgIn5S8, and excludes its assignment to relevant binary sulfides, e.g. In2S3. Resonant behavior of relative peak intensities in Raman spectra is different from that of larger-size stoichiometric NCs and bulk samples studied before, while the temperature dependence reveals an analogous enhancement of the highest-frequency LO modes supporting an unambiguous assignment of the latter. Therefore, we conclude that the Raman spectra observed are characteristic of the specific structure of these highly non-stoichiometric small NCs. IR modes of these NCs occur in the same frequency range as the Raman ones but at higher frequencies than the IR phonons in bulk material. The IR spectra are less characteristic, compared to Raman ones, revealing more similarity among the three NC compounds and with the bulk counterparts.

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Contributing Institute(s):

1. Helmholtz-Institut Erlangen-Nürnberg Erneuerbare Energien (IEK-11)

Research Program(s):

1. 113 - Methods and Concepts for Material Development (POF3-113) (POF3-113)
2. 530 - Science and Technology of Nanosystems (POF3-500) (POF3-500)

Appears in the scientific report 2021

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Database coverage:
; ; Clarivate Analytics Master Journal List ; Current Contents - Physical, Chemical and Earth Sciences ; Essential Science Indicators ; IF < 5 ; JCR ; SCOPUS ; Science Citation Index Expanded ; Web of Science Core Collection

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