Stoichiometry effect on Cu

Claudia Malerba, Cristy Leonor Azanza Ricardo, Matteo Valentini, Francesco Biccari, Melanie Müller, Luca Rebuffi, Emilia Esposito, Pietro Mangiapane, Paolo Scardi, Alberto Mittiga

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Thin films of Cu2ZnSnS4(CZTS) were prepared by sulfurization of multilayered precursors of ZnS, Cu, and Sn, changing the relative amounts to obtain CZTS layers with different compositions. X-Ray Diffraction (XRD), Energy Dispersive X-Ray spectroscopy, and SEM were used for structural, compositional, and morphological analyses, respectively. XRD quantitative phase analysis provides the amount of spurious phases and information on Sn-site occupancy. The optical properties were investigated by spectrophotometric measurements and Photothermal Deflection Spectroscopy. These films show a clear dependence of the optical and microstructural properties on the tin content. As the tin content increases we found: (i) an increase in both crystalline domain and grain size, (ii) an abrupt increase of the energy gap of about 150 meV, from 1.48 to 1.63 eV, and (iii) a decrease of sub-gap absorption up to two orders of magnitude. The results are interpreted assuming the formation of additional defects as the tin content is reduced. © 2014 AIP Publishing LLC.
Original languageEnglish
Article number011404
Pages (from-to)-
JournalJournal of Renewable and Sustainable Energy
Issue number1
Publication statusPublished - 1 Jan 2014


All Science Journal Classification (ASJC) codes

  • Renewable Energy, Sustainability and the Environment

Cite this

Malerba, C., Azanza Ricardo, C. L., Valentini, M., Biccari, F., Müller, M., Rebuffi, L., Esposito, E., Mangiapane, P., Scardi, P., & Mittiga, A. (2014). Stoichiometry effect on Cu. Journal of Renewable and Sustainable Energy, 6(1), -. [011404].