Morphology Controlled n-Type TiO2 and Stoichiometry Adjusted p-Type Cu2ZnSnS4 Thin Films for Photovoltaic Applications

Varadharajaperumal, S and Sripan, Chinnaiyah and Ganesan, R and Hegde, Gopalkrishna and Satyanarayana, M N (2017) Morphology Controlled n-Type TiO2 and Stoichiometry Adjusted p-Type Cu2ZnSnS4 Thin Films for Photovoltaic Applications. In: CRYSTAL GROWTH & DESIGN, 17 (10). pp. 5154-5162.

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Abstract

This paper presents the fabrication and characterization of stoichiometry adjusted Cu2Zn1.5Sn1.2S4.4 thin film (FTO/TiO2/CdS/CZTS/Au) photovoltaic (PV) devices. The PV devices were developed using the window layer of rutile TiO2 nanoarchitecture arrays, i.e., one-dimensional (1D) nanorods and three-dimensional (3D) combined/hierarchical structures (nanorods with microspheres). One-dimensional (1D) nanorods and 3D combined structures of TiO2 window layers were synthesized by a hydrothermal method with different solvents without any assistance of surfactants and templates. We achieved two kinds of TiO2 nanostructures by tuning the precursor concentrations and volume by keeping a constant growth time and temperature. The detailed structural properties were studied using X-ray diffraction and high resolution transmission electron microscopy. Phase formation and chemical state of the prepared samples were examined by Raman spectroscopy and X-ray photoelectron spectroscopy. The surface morphology and luminescence studies of TiO2 nanostructures were analyzed using field emission scanning electron microscopy and cathodoluminescence techniques. The current voltage performance of fabricated devices were measured under an AM 1.5 solar simulator. It is observed that combined structure PV device shows better efficiency (1.45%) than the nanorods alone structure (0.55%). Present work is a first attempt made to construct the inverted CZTS based solar cells. This study establishes the window layer of hierarchical TiO2 nanostructures based morphology that offers a great potential for the development of high-efficiency nonstoichiometric CZTS based solar cells.

Item Type:	Journal Article
Publication:	CRYSTAL GROWTH & DESIGN
Additional Information:	Copy right for this article belongs to the AMER CHEMICAL SOC, 1155 16TH ST, NW, WASHINGTON, DC 20036 USA
Department/Centre:	Division of Interdisciplinary Sciences > Centre for Nano Science and Engineering
Date Deposited:	03 Nov 2017 10:45
Last Modified:	04 Oct 2018 15:35
URI:	http://eprints.iisc.ac.in/id/eprint/58165

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