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Preparation of nanoporous TiO2 films for DSSC application by a rapid atmospheric pressure plasma jet sintering process

Author:
Chang, Haoming   Yang, Yao-Jhen   Li, Hsin-Chieh   Hsu, Cheng-Che   Cheng, I-Chun   Chen, Jian-Zhang  


Journal:
Journal of Power Sources


Issue Date:
2013


Abstract(summary):

We investigate the nanoporous TiO2 films sintered by atmospheric pressure plasma jets (APPJs) and their applications as photoanodes of dye-sensitized solar cells (DSSCs). A 30-s APPJ-sintered nanoporous TiO2 layer exhibits an additional absorption band between 400 and 500 nm in wavelength, attributed to incomplete removal of the organic solvents in the pastes. For TiO2 layers sintered by APPJs for 60 s and beyond, the absorption spectra are nearly identical to those of a conventional 15 min, 510 degrees C calcined sample. The XRD and XPS results indicate similar characteristics for APPJ-sintered and furnace-sintered TiO2 films. A DSSC with a 30-s APPJ-sintered TiO2 photoanode shows poor cell efficiency with an extremely large TiO2/dye/electrolyte electron transport interfacial resistance and a short carrier lifetime. As the APPJ treatment time reaches 60 s and beyond, the power conversion efficiencies become comparable to that of a sample with a 510 degrees C conventionally calcined TiO2 photoanode. Our experimental results verify that a 60-s APPJ sintering process is sufficient to replace a conventional 15 min, 510 degrees C furnace calcination process for TiO2 photoanodes of DSSCs. The ultra-short sintering process is made possible by the synergistic effect of the temperature and the reactivity of the APPJ, which can lower the fabrication cost. (c) 2013 Elsevier B.V. All rights reserved.


Page:
16-22


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