Abstract
For solid-state dye-sensitized solar cells (DSSCs), a composite electrolyte of polyethylene glycol methyl ether (PEGME) and titania (TiO 2) nanoparticles was prepared and characterized by Fourier transform-infra red (FT-IR), X-ray photoelectron spectroscopy (XPS), atomic force microscopy (AFM) and Raman spectroscopy. The heat treatment on PEGME and TiO 2 composite was found to be an essential step to improve morphology, amorphicity and ionic conductivity of PEGME–TiO 2 composite electrolytes. It was attributed to the increased bond strength of OC–O–Ti between PEGME and TiO 2 and increased surface roughness of composite materials, which may help to absorb a large amount of iodide couple and effective generation of I 3 − ions. A DSSC fabricated with heat treated PEGME–TiO 2 composite electrolyte showed significantly enhanced overall conversion efficiency of 3.1%, which was 20% higher than that of the DSSC fabricated with bare PEGME–TiO 2 composite electrolyte.
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