I want to obtained the best TiO2 layer thickness of Dye-sensetized solar cell using either a doctor blading or screen printing methods
The thickness of TiO2 layer depends on the dye you use. For ruthenium based dye, especially N719 dye, the thickness of 10 um of tio2 (20 nm particle size) is good enough. Screen printing is the most reliable technique to get good film quality. You may use scattering layer of tio2 (500 nm) to enhance current density. Good luck
For the optimized DSSC thin film layer by TiO2, you can find useful information by : "Fabrication of screen-printing pasted from TiO2 powders for Dye-sensitized solar cells" paper which is published in 2007, progress photovoltaics: research and applications.
Also I attached a picture which may helps you too.
It is so hard to control the thickness of TiO2 layer using doctor blade method.But if you a have a profilometer you will need first to optimize your coating method by making different samples and measuring it thickness and photovoltaic performance
Buda, with respect to all other replies. We were able to get regulary up to 8% efficient solar cells with N719 and other Ruthenium sensitizers by tape slot printing method (its simple and not require any screen). However, as Hemant mentioned dispersing layer and treatment with TiCl4 are also very crucial steps. Details are given in the below publication.
http://dx.doi.org/10.1016/j.dyepig.2014.08.005
Dr. Hammad Cheema, can you explain more details about tape slot printing method.
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