利用电沉积-溶剂热-硒化技术提高基于二硒化镍对电极的染料敏化太阳能电池的填充因子

doi:10.11896/cldb.18100196

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Abstract The photovoltaic performance of low-cost dye-sensitized solar cells (DSCs) should be further improved to promote the development and utilization of green renewable energy. The photovoltaic performance can be directly affected by counter electrode (CE) as an important part of DSCs. However, the photovoltaic performance of DSCs based on nickel selenides CE can be further improved. Therefore, the further enhance the electrocatalytic performances of nickel selenide CEs is one of the key scientific problems. To improve the electrocatalytic performances of nic-kel selenide CEs, various synthetic techniques have been used to control their morphology and phase. Specially, previous researches have shown that NiSe₂ nanomaterials exhibit good electronic conductivity and catalytic activity due to the more edge active sites. However, the DSC assembled from NiSe₂ CE shows the relatively smaller fill factor than that of the DSC assembled from platinum (Pt) CE.
In this work, we have demonstrated the electrodeposition-solvothermal-selenization technique to design and fabricate NiSe₂ CE. The fluorine-doped tin oxide (FTO) glass was used as substrate to synthesize Co(OH)₂ films by a potentiostatic electrodeposition technique. The nickel me-tal-organic frameworks (Ni-MOF) were fabricated on the Co(OH)₂ films by solvothermal method. And then selenium powder was used as sele-nium source to prepare NiSe₂ nanomaterials in an argon atmosphere by selenization technique. The results from SEM, TEM, XRD patterns, and XPS spectra demonstrate that as synthesized samples are composed of the pure phase NiSe₂. NiSe₂ nanomaterials appear as irregular nanoparticles with the average size of about 500 nm. And NiSe₂ nanomaterials uniformly grow on the surface of FTO glass, which can be directly applied as CE of DSCs. NiSe₂ CE was characterized by cyclic voltammetry (CV) curves, electrochemical impedance spectroscopy (EIS), and Tafel polarization curves to analysis electrocatalytic activity. The results demonstrate that NiSe₂ CE shows the narrower peak-to-peak potential separation, smaller series resistance, charge transfer resistance, the Nernst diffusion impedance, and the larger reduction peak current density and exchange current density, which indicating the excellent electrocatalytic performances of NiSe₂ CE. The reason for this is likely that the pure NiSe₂ nanomaterials with good crystallinity provides the more edge active sites. The adhesive strength between NiSe₂ nanomaterials and FTO glass have been enhanced by the fabrication technique, which is beneficial to facilitate the electron transfer. In addition, the photovoltaic performance of DSCs was carried out by photocurrent-voltage curves. It is found that the DSC based on NiSe₂ CE exhibits the high photovoltaic performance, and achieves the larger energy conversion efficiency of 7.63% than that of the DSC with Pt CE (7.21%). In particular, the fill factor of DSCs is effectively improved from 0.65 to 0.70, due to the small total resistance of NiSe₂ CE.
NiSe₂ CE has been successfully designed and synthesized by the electrodeposition-solvothermal-selenization technique. As-prepared NiSe₂ CE exhibits the excellent electrocatalytic performances, resulting in improving the photovoltaic performance of DSCs. Moreover, the fill factor of DSCs with NiSe₂ CE has been effectively improved by the technique.

Key words： nickel diselenide dye-sensitized solar cells electrodeposition solvothermal selenization

Published: 28 October 2019

CLC number:

TM914.4

Fund:This work was financially supported by the National Natural Science Foundation Youth Fund of China (61804062), the Science Research Foundation of Huaiyin Institute of Technology (17HGZ003).

About author:: Qingsong Jiang received his Ph.D. degree in optics from the Huazhong University of Science and Technology in 2014. He was appointed to the faculty upon gra-duation, and is currently a lecturer of Huaiyin Institute of Technology. He has published more than 16 SCI journal papers as the first author, applied 10 national invention patents and 4 of them are authorized. His research interests are the construction of dye-sensitized solar cells and perovskites solar cells based on photonic crystals. His research projects are the Natural Science Foundation Youth Fund of China, the Universities Natural Science Research Project of Jiangsu Province, and Jiangsu Overseas Visiting Scholar Program for University Pro-minent Young & Middle-aged Teachers and Presidents.

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	JIANG Qingsong
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Cite this article:

JIANG Qingsong,CHEN Junwen,YANG Ziying, et al. Improved Fill Factor of Dye-sensitized Solar Cells with Nickel Diselenide Counter Electrode by Electrodeposition-Solvothermal-Selenization Technique[J]. Materials Reports, 2019, 33(24): 4040-4045.

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http://www.mater-rep.com/EN/10.11896/cldb.18100196 OR http://www.mater-rep.com/EN/Y2019/V33/I24/4040

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