Proprietățile optice și structurale ale nanostructurilor din SnS și SnS₂ obținute prin metoda CVT

Oct 1, 2025·
Andrei Tiron
,
Vladimir Ciobanu
,
Alin Mamoico
Cătălin Creciunel
Cătălin Creciunel
,
Emil Rusu
· 1 min read
Abstract
This study presents a comprehensive investigation of the structural and optical properties of SnS and SnS₂ compounds synthesized via Chemical Vapor Transport (CVT). Analysis techniques including XRD, SEM, and optical spectroscopy confirm the layered growth (Van der Waals forces) with 5 nm dimensions. Optical characterization reveals band-gap energies of 1.25 eV (SnS) and 2.0 eV (SnS₂), with high absorption coefficients, making them ideal for photovoltaics and photocatalysis.
Type
Publication
Tehnologii fizice avansate cu aplicarea UVS în monitorizarea şi modelarea factorilor de mediu
publications

Key Research Findings

The synthesis of SnS and SnS₂ via the CVT (Chemical Vapor Transport) method allows for precise control over the nanostructure’s growth.

Structural Analysis (XRD & SEM)

  • Layered Growth: Electron microscopy confirmed that the materials grow in layers, bonded by weak Van der Waals forces, with typical dimensions around 5 nm.
  • Phase Purity: X-ray diffraction confirmed the crystalline lattice parameters and high phase purity of the compounds.

Optical Properties

  • SnS Band-gap: $\approx 1.25\ eV$ (ideal for solar spectrum absorption).
  • SnS₂ Band-gap: $\approx 2.0\ eV$.
  • Absorption: High coefficients ($10^5\ cm^{-1}$) in nanostructured form.

Potential Applications

Given their high absorption and tunable band-gaps, these materials are candidates for:

  1. Photovoltaics: Next-generation solar cells.
  2. Photocatalysis: Environmental cleanup and hydrogen production.
  3. Photodetection: High-sensitivity light sensors.
Nanotechnology SnS SnS2 Chemical Vapor Transport Photovoltaics Material Science
Cătălin Creciunel
Authors
Cătălin Creciunel (he/him)
Research Scientist & Embedded Systems Engineer
Cătălin Creciunel is a graduate of the Technical University of Moldova, specializing in microelectronics and nanotechnology. With over 5 years of experience as a Research Scientist, he has developed innovative solutions for semiconductor materials including ZnO, GaP, and InP through thermal treatment and anodization techniques. His expertise spans embedded software development in Python and C/C++, hardware design using CAD tools, and nanotechnology research including semiconductor and composite nanofiber production. Cătălin is dedicated to advancing technology through continuous learning and innovative contributions to microelectronics and embedded systems.