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The effect of TiO₂ surface modification on the photovoltaic properties of hybrid bulk heterojunction solar cells based on MEH-PPV/CdS/TiO₂ active layer

Thi Thuy Duong Vu, Jayeshkumar Patel, Frej Mighri, Trong-On Do and Abdellah Ajji

Article (2015)

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Abstract

In this work, we present the synthesis details of uniform shape and size-controlled titanium dioxide (TiO₂) nanorods followed by the deposition of cadmium sulfide (CdS) quantum dots on their surface. The achieved surfactant-capped-TiO2 nanorods as well as CdS/TiO₂ nanocomposites were dispersed in nonpolar solvents, which enabled an easy solution blending with poly (2-methoxy, 5-(2-ethyl-hexy-loxy)-p-phenyl vinylene) (MEH-PPV) conjugated polymer to prepare the active layer of bulk heterojunction solar cells (BHJSCs). The properties of the synthesized capped-TiO₂ nanorods, CdS/TiO₂ nanocomposites, as well as those of their corresponding blends with MEH-PPV were characterized using transmission electron microscopy (TEM), thermogravimetric analysis (TGA), UV-Visible spectroscopy, and photoluminescence (PL) technique. The characterization of the effect of the surfactants (oleic acid, OA, olyamine, OM, and 6-aminohexanoic acid, 6AHA) left on TiO₂ surface and CdS surface modification on BHJSC photovoltaic power conversion efficiency (PCE) showed that: i) for the same surfactants, when CdS was added on the surface of TiO₂ nanorods, the PCE increased due to the higher efficiency of CdS compared to MEH-PPV; and ii) the best PEC was obtained with CdS/OA-6AHA-capped-TiO₂ nanocomposite due to the shortest length of the carbon-chain of 6AHA, leading to higher charge carrier mobility.

Uncontrolled Keywords

bulk heterojunction solar cell; cadmium sulfide; nanocomposite; titanium dioxide

Subjects: 2000 Materials science and technology > 2001 Materials structure, properties and testing
2000 Materials science and technology > 2010 Thin films/interfaces
2300 Fuel and energy technology > 2303 Other sources of energy (solar, wind, etc.)
Department: Department of Chemical Engineering
Research Center: CREPEC - Center for Applied Research on Polymers and Composites
PolyPublie URL: https://publications.polymtl.ca/34373/
Journal Title: Green Processing and Synthesis (vol. 4, no. 2)
Publisher: de Gruyter
DOI: 10.1515/gps-2014-0092
Official URL: https://doi.org/10.1515/gps-2014-0092
Date Deposited: 18 Apr 2023 15:07
Last Modified: 09 Apr 2024 04:10
Cite in APA 7: Vu, T. T. D., Patel, J., Mighri, F., Do, T.-O., & Ajji, A. (2015). The effect of TiO₂ surface modification on the photovoltaic properties of hybrid bulk heterojunction solar cells based on MEH-PPV/CdS/TiO₂ active layer. Green Processing and Synthesis, 4(2), 79-90. https://doi.org/10.1515/gps-2014-0092

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