Is it possible to get Mott-Schottky plot using Metrohm Autolab?

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Thomas Perrier

Hello,

Yes you can get a Mott-Schottky plot using Metrohm Autolab! Use the "Potential scan FRA data" command to create your plot in NOVA 2.1.

Best Regards

Thomas

Isuru Lakmal

HI Thomas Perrier ,

It seems your suggestion is perfectly matching with my problem. Could you please let me know how I can change the scanning potential range (Vref)? I want to run my scan from -0.8 to 0.2 V.

Thank you.

Hello Isuru Lakmal ,

To perform a "scan", use the repeat command. You will find an example in the Default procedures under "Impedance Spectroscopy" : FRA Potential Scan and adjust the settings. I think it is what you want to do, if not let me know.

Hi Thomas Perrier ,

I have tried in your way and it's perfectly working. I have doubt about the effective effective area. In the Gamry software, effective area must input in order to run the analysis. But in NOVA, I didn't find place to input the effective area. Could you please give a suggestion about this.

Hi Isuru Lakmal ,

Sorry but I have never used Mott-Schottky plot. I just know you have this option in Nova but I can't help you on how using it.

Good luck,

Jaideep Malik

Hello Isuru Lakmal

Can you help me with recording Mott Schottky data in AutoLAB.

What parameters and what command and method file shall I choose?

Hi Jaideep Malik

You can use the FRA potential scan function. In there, go to "Repeat for multiple values" and you can define the potential range for the scan by clicking on "More".

In the FRA measurement element, it's better to go for a single frequency other than scanning multiple frequencies. For that, give the same value for the first applied frequency and the last applied frequency. Usually, I give 1000 Hz. According to your requirement, you have to decide the better one for you. But keep in mind that, both flat band potential and carrier concentration (slope of the graph) will change with the applied frequency.

You can apply 0.01 Vrms sine wave so your sample will not damage.

Finally, to observe the Mott-Schottky plot, go to "Potential scan FRA data" and go to its settings by clicking on "More". Then turn on the "Mott-Schottky Rs-Cs".

That's it. Good luck...