Journal
ELECTRONIC MATERIALS LETTERS
Volume 11, Issue 2, Pages 171-179Publisher
KOREAN INST METALS MATERIALS
DOI: 10.1007/s13391-014-4236-x
Keywords
core/shell; ZnO/CdS; semiconductor sensitized solar cell; nanorods
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Funding
- University Grants Commission (UGC)
- Department of Science and Technology India
- Converging Research Center program - Ministry of science, ICT and Future Planning [2013K000407]
- Human Resource Development of the Korea Institute of Energy Technology Evaluation and Planning (KETEP) grant - Korea government Ministry of Knowledge Economy [20124010203180]
- National Research Foundation of Korea [2014M3C1A8048837] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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One dimensional type-II core/shell heterostructures are widely employed in solar cells because of their adventitious role in both light absorption and charge separation. Here we report a facile two step chemical approach to synthesizing ZnO/CdS core/shell nanorod arrays. ZnO nanorods (ZNR) with a high aspect ratio were grown using a hydrothermal technique where a uniform CdS shell was deposited using a facile, linker free, one pot, Hexamethylenetetramine (HMTA) based reflux technique for the first time. Though the reflux technique is quite similar to the chemical bath deposition technique (CBD), we obtained more uniform CdS coating and improved solar cell performance with the ZnO/ CdS heterostructure compared to CBD-grown ZnO/CdS heterostructures. To obtain a conformal coating of CdS, we optimized the CdS deposition time. Formation of pure phase ZnO/CdS core/shell heterostructure was confirmed by high resolution transmission electron microscopy and X-ray photoelectron spectroscopy (XPS) depth analysis. Improved solar cell performance of 1.23% was obtained for ZnO/CdS core/shell structures with ZnS surface treatment.
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