Specific Process Knowledge/Characterization/AFM: Atomic Force Microscopy/KPFM: Difference between revisions
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For reference I prefer using the gold as the two other materials form oxides and I think the uncertainty of the values are higher. | For reference I prefer using the gold as the two other materials form oxides and I think the uncertainty of the values are higher. | ||
But even for gold you can find several different values for the work function. Take a look at these references: [http://student.ndhu.edu.tw/~d9914102/Teaching/EM/Paper/data/The%20work%20function%20of%20the%20elements%20and%20its%20periodicity.pdf], [https://en.wikipedia.org/wiki/Work_function#Work_functions_of_elements[11]]. The work function value range for gold seems to be from 5.10eV to 5.47eV. 5.10eV for poly crystaline gold and the higher values for | But even for gold you can find several different values for the work function. Take a look at these references: [http://student.ndhu.edu.tw/~d9914102/Teaching/EM/Paper/data/The%20work%20function%20of%20the%20elements%20and%20its%20periodicity.pdf], [https://en.wikipedia.org/wiki/Work_function#Work_functions_of_elements[11]]. The work function value range for gold seems to be from 5.10eV to 5.47eV. 5.10eV for poly crystaline gold and the higher values for single crystalline gold. I believe I do not have single crystalline gold, so I will use the 5.10eV as the reference value for the sample. | ||
To get the work function of the your sample of interest you need to find the work function of the tip as what you measure is the work function difference between the tip and the sample. | |||
Measured surface potential = Work funtion (Tip) - Work function (sample) | |||