I have tried to make TiO2 paste using dilute nitric acid but it gave a cracked film, so I'm asking how can I get a homogenous film on ITO glass substrate.
Mr. Eman Mohmed,
Spin coating is a better technique to get the homogeneous films for DSSC.
thank you Dr Anil Kumar for your response but the problem in the adherence of the film on the substrate
Dear Eman Mohmed, I'm pursuing PhD . I'm also working on the DSSC applications. if you are using spin coater, it is better to use the homogenous solution of TiCl2 which is an precursor solution of the solgel technique and regarding the adherence you can heat the substrate on the hotplate after the film was suppose to be deposited for sometime it will enhance the crystallanity and the adhesive property of the film developed. it is important to note that the rpm and time plays a crucial role in developing the film.
dear Mr nikhil, I would try to use PVA+TiO2+aquades but my pasta when I deposition on FTO with heating, my film be black,
Hi,
I do not know how your past looks like and your paste can be used for spincoating or doctor-blading, but I think you can make your film by a number of thinner layers to reduce crack. Between layers, you let it dry in air then dry in hotplate at 100 degree C for about 5-15 min depending on your film thickness. If this do not help, I think you check and change your past recipe. I prepared TiO2 paste following Grazel group's paper and it worked. Good luck
We are also trying the same thing but we have the problem of uniform coating. We can obtain uniform coating of TiCl4 solution on ITO glass by spin coating. Can some one help out in this matter.
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