Influence of sulphide precursor on crystal phase of ternary I–III–VI2 semiconductors
Samples of AgInS2 and CuInS2 nanoparticles were synthesized by hot-injection method at 270 °C using 1-dodecanethiol (DT) and elemental sulphur (S) as sulphide precursors, and oleylamine as reaction medium and surfactant. Composition, crystal structure, and particle size of obtained materials were tracked by XRD and TEM/HRTEM measurements. It was shown that, due to its dual role as sulphur source and surfactant, DT drastically slows formation of desired material. Samples obtained with DT even after 4 h of reaction have traces of intermediary compound (β-In2S3), whereas in samples synthesized with elemental S these traces are less pronounced. The growth mechanism and influence of each reaction step are discussed in detail.
KeywordsTernary chalcogenides I–III–VI2 semiconductors Crystal phase Hot-injection synthesis X-ray diffraction HRTEM Electronics
Financial support for this study was granted by the Ministry of Education and Science of the Republic of Serbia (Projects: III45020 and OI172056). This research was also supported by COST Actions CM1101 and MP1106.
- Nairn JJ, Shapiro PJ, Twamley B, Pounds T, von Wandruszka R, Fletcher TR, Williams M, Wang C, Norton MG (2006) Preparation of ultrafine chalcopyrite nanoparticles via the photochemical decomposition of molecular single-source precursors. Nano Lett 6:1218–1223. doi: 10.1021/nl060661f CrossRefGoogle Scholar
- Tian L, Elim HI, Ji W, Vittal JJ (2006) One-pot synthesis and third-order nonlinear optical properties of AgInS2 nanocrystals. Chem Commun 4276–4278. doi: 10.1039/b607855a
- Wang D, Zheng W, Hao C, Peng Q, Li Y (2008) General synthesis of I–III–VI2 ternary semiconductor nanocrystals. Chem Commun 2556–2558. doi: 10.1039/b800726h