What are some ways to reduce dye desorption from the TiO2 surface in aqueous-based dye sensitized solar cells (DSSCs)?

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Sheng Cai Tan

Dear Muhammad Sadiq , you may want to refer to the following: https://purehost.bath.ac.uk/ws/portalfiles/portal/187920954/Thomas_Risbridger_PhD_Thesis.pdf

Hope it helps.

R. Sagayaraj

Dear MS

1. Increase the surface area of the TiO2 particles.

2. Increase the hydrophobicity of the TiO2 surface.

3. Increase the thickness of the TiO2 layer.

4. Use a hydrophobic binder to bind the TiO2 particles together.

5. Use a hydrophilic binder to bind the TiO2 particles together.

6. Increase the pH of the electrolyte solution.

7. Use a surfactant to reduce the surface tension of the electrolyte solution.

8. Use a dye with a higher affinity for the TiO2 surface.

9. Use a dye with a lower solubility in the electrolyte solution.

10. Use a dye with a higher molecular weight.

Ponniah Vajeeston

Hi!

Dye desorption is a common issue in DSSCs that can lead to a decrease in the overall performance of the device. There are a few different techniques that can be used to reduce dye desorption in aqueous-based DSSCs:

Surface modification: The photoanode can be modified to improve the stability of the dye. This can be done by incorporating a layer of hydrophobic or hydrophilic molecules on the surface of the photoanode to increase the strength of the dye-adsorbent interaction.

Use of a cross-linker: A cross-linker can be used to chemically link the dye molecules to the surface of the photoanode, which will help to prevent desorption.

Use of a thicker electrolyte film: A thicker electrolyte film can be used to reduce the rate of dye desorption. This can be achieved by using a thicker layer of electrolyte or by using an electrolyte with a higher viscosity.

Use of a co-adsorbent: A co-adsorbent can be used to improve the stability of the dye. This can be done by adding a small amount of a second molecule that can bind to the dye and prevent it from desorbing.

Use of a protective coating: A protective coating can be applied over the dye to reduce the rate of desorption. This can be done by using polymers, waxes or other materials that can form a physical barrier to protect the dye from desorption.

It's worth noting that in order to effectively reduce dye desorption it may be necessary to use a combination of these techniques. Additionally, it's important to keep in mind that each DSSC system is unique and the most effective technique(s) will depend on the specific system being studied.