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Nanostructural and photo-electrochemical properties of solution spin-coated Cu2ZnSnS4–TiO2 nanorod forest films with an improved photovoltaic performance

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Abstract

Cu2ZnSnS4 (CZTS), other than in standard p–n junction device architecture, can be employed as a broad light absorber upon coating onto a wide bandgap electron conducting TiO2 film. Earlier CZTS sensitized TiO2 films have yielded low photoconversion efficiency and Voc. In this work, a water–ethanol solution spin coating approach has been applied to directly deposit CZTS nanocrystallites on rutile TiO2 nanorods grown on an FTO substrate (TNR) for evaluation in a sensitized solar cell configuration. The FTO@TNR@CZTS photoanode following controlled annealing is shown to exhibit improved photovoltaic properties. Focused-ion beam cross-sections of CZTS nanocoating onto TiO2 nanorod forest films have revealed nanoscale morphological details and electrochemical impedance spectroscopy helped identify TiO2 nanorod film growth characteristics for a reduced charge recombination. The band alignment of CZTS and TiO2 has been determined by XPS helping to explain the origin of Voc deficit. An all-solid state device featuring spiro OMeTAD as HTM and CdS as a buffer layer has been designed with 2% efficiency.

Graphical abstract: Nanostructural and photo-electrochemical properties of solution spin-coated Cu2ZnSnS4–TiO2 nanorod forest films with an improved photovoltaic performance

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Publication details

The article was received on 27 Feb 2017, accepted on 08 May 2017 and first published on 10 May 2017


Article type: Paper
DOI: 10.1039/C7NR01422H
Citation: Nanoscale, 2017, Advance Article
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    Nanostructural and photo-electrochemical properties of solution spin-coated Cu2ZnSnS4–TiO2 nanorod forest films with an improved photovoltaic performance

    Z. Wang, R. Gauvin and G. P. Demopoulos, Nanoscale, 2017, Advance Article , DOI: 10.1039/C7NR01422H

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