Dresden 2026 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 1: Optical Properties I

HL 1.4: Talk

Monday, March 9, 2026, 10:15–10:30, POT/0006

Thin Films of Size-Selected Cu₂ZnSnS₄ and Cu₂NiSnS₄ Nanocrystals: Structural and Optical Properties — •Oleksandra Ivakhno-Tsehelnyk¹, Serhiy Kondratenko², Volodymyr Dzhagan³, and Dietrich R.T. Zahn¹ — ¹Semiconductor Physics & Research Center for Materials, Architectures and Integration of Nanomembranes (MAIN), Chemnitz University of Technology. — ²Taras Shevchenko National University of Kyiv, 01601 Kyiv, Ukraine. — ³Lashkaryov Institute of Semiconductor Physics, NAS of Ukraine, 03038 Kyiv, Ukraine.

An investigation was conducted into thin films of Cu₂NiSnS₄ (CNTS) and Cu₂ZnSnS₄ (CZTS) nanocrystals (NCs) in the context of their promising use for photovoltaics (PV). Colloidal NC ensembles were obtained by "green" colloidal synthesis and directly subjected to size-selective centrifugation, yielding fractions of different sizes. This approach provides a relatively non-toxic and scalable method of producing light-absorbing NC materials. The thin films were prepared by spin-coating the NC fractions onto various substrates. A range of analytical techniques were employed to investigate their properties, encompassing Raman spectroscopy, atomic force microscopy (AFM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and spectroscopic ellipsometry. These techniques enabled the investigation of the relationship between the crystal structure, composition, morphology, and optical properties with the size of CZTS and CNTS nanocrystals.

Keywords: CZTS; CNTS; nanocrystals; size-selected; optical properties