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Title: Understanding the synthetic pathway of a single-phase quarternary semiconductor using surface-enhanced raman scattering : a case of Wurtzite Cu2ZnSnS4 nanoparticles
Authors: Tan, Joel Ming Rui
Lee, Yih Hong
Pedireddy, Srikanth
Baikie, Tom
Ling, Xing Yi
Wong, Lydia Helena
Keywords: DRNTU::Science::Chemistry
Issue Date: 2014
Source: Tan, J. M. R., Lee, Y. H., Pedireddy, S., Baikie, T., Ling, X. Y., & Wong, L. H. (2014). Understanding the synthetic pathway of a single-phase quarternary semiconductor using surface-enhanced raman scattering : a case of Wurtzite Cu2ZnSnS4 nanoparticles. Journal of the American chemical society, 136(18), 6684-6692.
Series/Report no.: Journal of the American chemical society
Abstract: Single-phase Cu2ZnSnS4 (CZTS) is an essential prerequisite toward a high-efficiency thin-film solar cell device. Herein, the selective phase formation of single-phase CZTS nanoparticles by ligand control is reported. Surface-enhanced Raman scattering (SERS) spectroscopy is demonstrated for the first time as a characterization tool for nanoparticles to differentiate the mixed compositional phase (e.g., CZTS, CTS, and ZnS), which cannot be distinguished by X-ray diffraction. Due to the superior selectivity and sensitivity of SERS, the growth mechanism of CZTS nanoparticle formation by hot injection is revealed to involve three growth steps. First, it starts with nucleation of Cu2–xS nanoparticles, followed by diffusion of Sn4+ into Cu2–xS nanoparticles to form the Cu3SnS4 (CTS) phase and diffusion of Zn2+ into CTS nanoparticles to form the CZTS phase. In addition, it is revealed that single-phase CZTS nanoparticles can be obtained via balancing the rate of CTS phase formation and diffusion of Zn2+ into the CTS phase. We demonstrate that this balance can be achieved by 1 mL of thiol with Cu(OAc)2, Sn(OAc)4, and Zn(acac)2 metal salts to synthesize the CZTS phase without the presence of a detectable binary/ternary phase with SERS.
DOI: 10.1021/ja501786s
Schools: School of Materials Science & Engineering 
School of Physical and Mathematical Sciences 
Rights: © 2014 American Chemical Society. This is the author created version of a work that has been peer reviewed and accepted for publication by Journal of the American Chemical Society, American Chemical Society. It incorporates referee’s comments but changes resulting from the publishing process, such as copyediting, structural formatting, may not be reflected in this document. The published version is available at: [Article DOI:].
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:MSE Journal Articles
SPMS Journal Articles

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