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Current-Voltage characteristics
With KEITHLEY High-Voltage Source Electrometer Unit
Instructions
1. Turn on the Keithley power source and wait at least 30 minutes for warm up in order to assure good accuracy of measurement. Make sure the output is on standby(no voltage at output
terminals)
2. Place your sample in the I-V measurement box, then solder the electrical leads to its terminals if applicable or just place the sample without wires between the box clemps.
3. Double click on the ICS icon.
4. Click on File menu and choose a file, then click OK.
5. On top of the window, click on the Edit Test Setup menu, and then click on SMU Setup. The following conditions should be met:
a. Under Stimulus (select Voltage, and the Rng should be AUTO).
b. Under Measure (select Voltage, select Current, and the Rng should be AUTO).
c. Under Option (Input a desired Delay time (normally from (3-5) sec), select 60 Hz for Integration, and 32 RDG for Filter).
d. Under Force Condition select SWEEP for Mode, LIN for Type, 10.000 m (you may set it lower or higher as you consider safe for sample under test) for Compl, input Start & Stop values
for voltage, and input the number of points (data) you wish to take between your Start & Stop condition. Voltage Step Size will be automatically calculated by the computer.
e. Note: All the times when you conduct an I-V measurement on an unknown sample set low values for start and stop of voltage sweep. A small number of points and a shorter delay time
may help to provide the safety of the sample. After this you have good information about how high is safe to go with your sample to test.
6. Now click on OK button in SMU Setup window, and then click on Done button in Setup Editor window.
7. Now go to Tool Bar at the top of the window and click on the Measure Button:
For Bias over 180 V, the computer will give a warning, on the warning window and in order for the computer to start acquiring data, you must click OK.
Note
Look at the high voltage power supply to ensure that the computer has remote operation at the Keithley high voltage power supply. A red light (RMT) will appear, and the operate button will be on.
Once the date has been taken, the Keithiley will show 0.000 V and be back in standby mode.
8. To display a plot of the data, click on the Create Plot button at the top of the window, and input a value in Plot Definition, then click on Done button.
9. To view data, click on the Data View button at the top of the window, click on your data file, then go to File menu, click on Save As, give a name to your file, and input as many
attributes (data description) as possible:
The first attribute should be the project name or person doing the work. The second attribute should be the sample name. The third attribute should be the voltage range. However, there are some other optional
attributes, which allows you to give greater description of the sample, date, process, etc.
10. Once the data is saved, you can then export them to a file on the hard drive.
11. To export data, click on File menu, then click on Export:
a. In the Export Data window, properly rename the name in the Save As filename box.
b. In the Directories box, scroll down to [A], and then select [A].
c. In the Data Format box, select Ascii all set up, and finally click on OK button.
12. Plot the data using appropriate software like Origin, Sigmaplot or other
a) Make sure you mention type of measurement, sample identification, sample size,processes, details about measure conditions(voltage excursion, delay time, sample orientation).
b) Use best liniar fit to evaluate resistivity. Mark it down.
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