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HL: Fachverband Halbleiterphysik

HL 85: Poster Session II

HL 85.61: Poster

Donnerstag, 17. März 2011, 18:00–21:00, P4

Crystallographic structure and grain size of polycrystalline Cu₂ZnSnS₄ nanoparticles and thin films studied with XRD and SEM — •Folker Zutz, Christine Chory, Ingo Riedel, and Jürgen Parisi — Thin Film Photovoltaics, Energy and Semiconductor Research Laboratory, University of Oldenburg, D-26111 Oldenburg

Cu₂ZnSnS₄ (CZTS) is a compound semiconductor with an absorption coefficient of >10⁴ cm⁻¹ and energy gap of about 1.5 eV. Because CZTS is comprised of abundant and non-toxic precursor elements the semiconductor represents an attractive material for low-cost thin film solar cells. CZTS nanoparticles (NP) were prepared in a low-temperature colloidal synthesis yielding high amounts per synthesis cycle. For thin film deposition the NPs were converted to an ink which can be processed to thin films via printing techniques. Finally, the thin films were annealed in argon atmosphere at different temperatures in order to control the growth of microcrystallites. The photoelectrical quality of the semiconductor sensitively depends on the relative concentrations of the precursor elements (band gap, crystallographic phases) and the average grain size (charge transport). We report on structural investigations (X-ray diffraction, electron microscopy) of CZTS dried powders and thin films processed from inks with varying chemical compositions. Further, the evolution of the grain size was studied as function of the annealing temperature.