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Potential difference in KPM measurement

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Arthur Tseng posted on Tue, Jul 7 2015 9:32 PM

Hi All, 

I measured two different metal(Au & Pd) in KPM mode. The Pd is overlapping with Au.

Basically, the work functions of Au and Pd are about 5.1eV and 5.22eV, respectively.

I expect that the potential difference of these two metal measured by KPM is about 0.1V(=100mV), but the measured value is much less than that (only 10~20mV). 

Thank you for any suggestions.

Arthur

 

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Top 25 Contributor
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Bruker Employee

Hi Arthur,

One suggestion, if you are using amplitude modulation version of KPFM, make sure you scan a large enough area away from the overlap region. You need the whole cantilever (not tip) over Au, and again over Pd to get robust numbers for each. For a typical width cantilever this means scanning 60-80um across the overlap (centered at the overlap) with the long axis of the cantilever parallel to the overlap. I suspect the further you scan from the overlap the closer the measured potential difference will be to the expected 100mV.

 

Best regards

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Top 100 Contributor
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Points 113

Hi, Ian

Thank you for your advice.

It's very clear to me.

I will try it.

Best regards,

 

Arthur

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Top 10 Contributor
62 Posts
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Hi Arthur,

Please contact our Tech Support for more information about running KPFM: AFM.Support@bruker.com and +1 800-873-9750

The Application Note here is also very helpful: http://nanoscaleworld.bruker-axs.com/nanoscaleworld/media/p/3273.aspx

Thanks,

Teddy

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Top 100 Contributor
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Hi Teddy,

Thank you for your information.

Best regards,

Arthur

 

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