Download Deep-Level Transient Spectroscopy

Genplot commands you may find useful are:
[pwd] -lists current directory
[ls] or [dir] -lists contents of directory
[cd xxx] -changes to directory xxx
[cd ..] -goes up a directory level
[read] -reads your data file
[show] -show the data
[pl] -plot the data
[trans dy/dx] -differentiates the data
[write] -saves data file to disk
[fit lin] -to perform a linear fit
[lt n] -to plot with a line type n
[lt 0 sy n] -to plot with symbol type n
[pen n] -to plot with colour n
[ov -fit] -to overlay the fit
You can now import the file into Excel to calculate the free carrier concentration. You should obtain values on
the order of 1015 cm−3 . Comment on any differences between your scans.
From your profile determine a depth range over which you want to perform DLTS over and establish what biases
are needed for depletion depths over this range. Discuss this with your demonstrator before continuing.
4.7
DLTS measurement
Equipment:
• Air Liquide LN2 cryostat/dewar (rotary roughing pump, N2 diaphram pump, temp controller)
• National instruments BNC-adaptor/DAC, SULA/Labview software
• SULA Pulse generator, capacitance meter, 4 correlator units
Again the chamber should still be under vacuum and inserted into the dewar. Furthermore the sample should
be at 78 K. If not, make it so.
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