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One-pot thermolysis synthesis of CuInS2 nanoparticles with chalcopyrite-wurtzite polytypism structure

Vahidshad, Y ; Sharif University of Technology | 2015

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  1. Type of Document: Article
  2. DOI: 10.1007/s10854-015-3579-x
  3. Publisher: Springer New York LLC , 2015
  4. Abstract:
  5. CuInS2 nanoparticles as the visible (wurtzite, 1.67 eV) or near infrared (chalcopyrite, 1.50 eV) light absorbing material in thin film solar cells, were synthesized using facile, one step heating up method by dissolving of CuCl, InCl3 and SC(NH2)2 as precursors in oleylamine (OLA) alone or in combination with oleic acid (OA) and 1-octadecene (ODE) as solvent. The phase, size, morphology, and size distribution were controlled by the coordination ability between solvent molecules and metal precursors, reaction temperature and time. The presence of higher amounts of thiourea or OA to OLA led to the formation of chalcopyrite phase in comparison to wurtzite structure. Also, higher reaction temperatures (>240 °C) resulted in favour of more chalcopyrite phase and higher crystallinity but the nanoparticles got agglomerated. As synthesized nanoparticles was characterized by transmission electron microscopy, X-ray diffraction, X-ray photoelectron spectroscopy, high resolution-transmission electronic microscopy, ultraviolet–visible-near infrared, photoluminescence. The high resolution TEM confirmed the existence of chalcopyrite structure along with wurtzite structure in the nanocrystal (polytypism). Well controlled chalcopyrite CuInS2 triangular pyramidal shape with an average size ranging from ~10–20 nm size was obtained by using 20 ml OLA or 20 ml OLA along with 4 ml OA and ODE, respectively, with 210 °C heating up and 4 h annealing time
  6. Keywords:
  7. Coordination reactions ; Copper compounds ; Infrared devices ; Nanoparticles ; Ordinary differential equations ; Synthesis (chemical) ; Transmission electron microscopy ; X ray diffraction ; Zinc sulfide ; Absorbing materials ; Chalcopyrite structures ; Coordination ability ; High resolution transmission electronic microscopy ; High-resolution TEM ; Reaction temperature ; Thin film solar cells ; Visible near-infrared ; X ray photoelectron spectroscopy
  8. Source: Journal of Materials Science: Materials in Electronics ; Volume 26, Issue 11 , November , 2015 , Pages 8960-8972 ; 09574522 (ISSN)
  9. URL: http://link.springer.com/article/10.1007%2Fs10854-015-3579-x