Morphological, optical and photovoltaic characteristics of MoSe2/SiOx/Si heterojunctions

This work reports the effect of different processing parameters on the structural and morphological characteristics of MoSe2 layers grown by chemical vapour deposition (CVD), using MoO3 and Se powders as solid precursors. It shows the strong dependence of the size, shape and thickness of the MoSe2 l...

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Bibliographic Details
Published in:Scientific reports Vol. 10; no. 1; p. 1215
Main Authors: Silva, José Pedro Basto, Marques, C. Almeida, Viana, A. S., Santos, L. F., Gwozdz, K., Popko, E., Connolly, J. P., Veltruská, K., Matolín, V., Conde, O.
Format: Journal Article
Language:English
Published: London Nature Publishing Group 27-01-2020
Nature Publishing Group UK
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Summary:This work reports the effect of different processing parameters on the structural and morphological characteristics of MoSe2 layers grown by chemical vapour deposition (CVD), using MoO3 and Se powders as solid precursors. It shows the strong dependence of the size, shape and thickness of the MoSe2 layers on the processing parameters. The morphology of the samples was investigated by field emission scanning electron microscopy (FESEM) and the thickness of the deposited layers was determined by atomic force microscopy (AFM). Raman and photoluminescence (PL) spectroscopies were used to confirm the high quality of the MoSe2 layers. Surface composition was examined by photoelectron spectroscopy (XPS). Moreover, the MoSe2/SiOx/Si heterojunctions exhibit diode behaviour, with a rectification ratio of 10, measured at ±2.0 V, which is due to the p-i-n heterojunctions formed at the p-Si/SiOx/MoSe2 interface. A photovoltaic effect was observed with a short circuit current density (Jsc), open circuit voltage (VOC) and efficiency of -0.80 mA/cm2, 1.55 V and 0.5%, respectively. These results provide a guide for the preparation of p-i-n heterojunctions based on few-layer MoSe2 with improved photovoltaic response. Tis work was supported by the Portuguese Foundation for Science and Technology (FCT) in the framework of the Strategic Funding Contracts UID/CTM/04540/2019 and UID/FIS/04650/2019. Part of this work was supported by the COST Action MP1406 “Multiscale in modeling and validation for solar photovoltaics (MultiscaleSolar)”. Te authors acknowledge the CERIC-ERIC Consortium for access to experimental facilities and fnancial support under proposal 20182042.
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ISSN:2045-2322
2045-2322
DOI:10.1038/s41598-020-58164-7