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Angastiniotis, Nicos
Cyprus University of Technology
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- 2022Comparative Study of Polyethylene Films Embedded with Oxide Nanoparticles of Granulated and Free-Standing Nature
- 2021Controlling the optical properties of nanostructured oxide-based polymer films.citations
- 2014 Controlled Thermal Processing and In Situ Characterization of Single Phase CZTS Thin Films
- 2014Cyprus University of Technology (Research Output)
- 2007Large Scale Synthesis of Nanomaterial Building Blocks that Deliver Predefined Functionality
- 2007Bottom Up Synthesis of Nanomaterial Building Blocks through the use of Metastabilization
- 2005Nanomaterials By Design
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document
Controlled Thermal Processing and In Situ Characterization of Single Phase CZTS Thin Films
Abstract
The kesterite crystal structure of Cu2ZnSnS4 (CZTS) is a new and promising material for harvesting solar energy for photovoltaic applications due to its high theoretical absorptivity and direct band gap [1]. Its comprising species are affordable as they are abundant therefore making it an attractive alternative absorber material for photovoltaic devices [2]. Achieving however the high theoretical values has been the goal of intense research due to the difficulties that are predominantly encountered in relation to the invention of a synthesis method that is capable of consistently isolating the narrow region of the single CZTS phase [3] thus making it possible to capitalize on the full potential of this new photovoltaic material. This work has managed by in situ monitoring of the thermokinetic behavior of the CZTS system to pursue methodically the spontaneous formation of the single phase thereby eliminating the escaping tendency of the comprising species when they have to shuffle among the various metastable phases before attaining the equilibrium phase. Several CZTS-precursor film stacks were deposited from the binary compounds (Cu2S, ZnS, and SnS2) by sputtering under various conditions thereby producing two modes of deposition (i.e., co-sputtered and sequential) both on Glass and on Mo-coated Glass substrates. XRD characterization was subsequently used for assessing the state of the as-deposited species before carrying out the in situ thermokinetic measurements which provided the means to single out the state of existence of the single phase. Once the single phase is isolated thin films of large size can be thermally treated accordingly in a custom made experimental set up. Through the in situ monitoring of the thermokinetic behavior of the CZTS system we managed to design, control and consistently pursue the synthesis of a homogenous single kesterite phase at predetermined temperatures. The methodology which was implemented is suitable for large scale manufacturing of CZTS thin films for photovoltaic applications.REFERENCES 1. K. Ito, T. Nakazawa, Jpn. J. Appl. Phys., 27 (1988) 2094. 2. Z. Hu, S. Gao, Chemical Geology, 253, (2008) 205-221. 3. D. Olekseyuk, I. V. Dudchak, and L. V. Piskach, Journal of Alloys and Compounds, vol. 368, no. 1-2 (2004) 135-143.