I am using FTO glass for DSSC fabrication. I have two questions related to the resistivity of FTO glass:
1) We ordered FRO glass with 10 ohm resistivity, but when I check, it is around 30 ohm. Also, I notice that resistivity changed by changing the distance between the two multimeter probes, so how can I know the right resistivity of the glass?
2) I need to reuse the FTO glass; therefore, I dipped the glass in acetone and soap for 1 day, then I cleaned it by sonication in acetone, methanol and water for 30 min in each. Then I measured the resistivity, and now it is around 50 ohms, and also it is affected by the distance between the probes. How can I know the value of the resistivity that confirms that the FTO cannot be used anymore?