Which method or equipment do we have to use for this analysis?
Type of semiconductor can be determined using the polarity of the Hall voltage. First do hall measurement for metal. Then do it for semiconductor. Metal and n-type have same polarity (majority carriers are electrons). P-type has opposite polarity( Majority carriers are holes)
Type of semiconductor can be determined using the polarity of the Hall voltage. First do hall measurement for metal. Then do it for semiconductor. Metal and n-type have same polarity (majority carriers are electrons). P-type has opposite polarity( Majority carriers are holes)
Hall effect is the most reliable method to do this. Polarity of measured hall voltage says it all. http://www.nist.gov/pml/div683/hall_effect.cfm
thermoelectric measurements will give you the information about the charge carriers.
You can use the measurements of Hall voltage and coefficient ,These measurements will be used to find the semiconductor type (n or p).
You should be a Hall measurement in dc. In this case, you know the real sign of the Hall voltage. AC measurements could be confusing. You will need to know the direction of the magnetic field.
hello
hall measurements , the signe of porteurs concentration;
and u can add thermoelectric effect ( read the paper of Moharezdi )
Thanks Charazade..
Can you send me the link of the paper?.
There are several ways of finding the semiconductor conductivity type.
The polarity of the Hall voltage is one of these.
The capacitance-voltage (C-V) characteristic of an MOS (metal-oxide-semiconductor) capacitor is another and a reliable technique. The MOS C-V characteristic has an asymmetry which indicates the conductivity type. The C-V on p-type silicon will be a mirror image of the same on n-type silicon, provided all the other parameters of the MOS capacitor are the same except the conductivity type. The interface trap density should not be too high.
...Is the easiest way - use a thermal probe and any (very simple) VI-meter (if you dont need any precision, but only for identification - what kind of the type this material)
NB: ... this analysis - just 1 minute :) good luck
The measurement of thermoelectricpower is the right experiment because Hall effect experiment gives opposite sign in amorphous state of the same semiconductor
hot probe is the best way and easiest to distinguish between p and n type of a semiconductor.
To determine the type of doping, n or p, you have the opportunity to do it from the Hall Effect technique, Capacity-voltage (C-V) measurements and finally the hot probe technique (Seebeck effect); The latter technique is easy to implement insofar as it does not require sophisticated equipment.
If Hall coefficient is positive, it is p-type semiconductor.
If Hall coefficient is negative, it is n-type semiconductor.
Why to go for Hall measurement. One can detect the type of semiconductor merely by touching with the finger. See attached file. I developed and used this technique for more then 50 detection accurately.
In p-type semiconductor the electrical carrier is hole and in the other the electrical carrier is electron. There are many method to check the type, say, thermal probe method, Hall effect measurement
I think we can also used Field-effect transistor (FET) to identify n-type or p-type semiconductor material.
The field-effect transistor (FET) is an electronic device which uses an electric field to control the flow of current. This is achieved by the application of a voltage to the gate terminal, which in turn alters the conductivity between the drain and source terminals.
I have another question in this issue. please guide me.
how can I measure or find the type of impurity in "n" (or "p") type semiconductor? I mean, what is the doped material ( phosphorus , boron ...)?
Hall effect technique capacity voltage measurement
and Seebeck effect
are utmost useful to identify n and p type of semiconductor in amorphous state.
Make an instrument in your laboratory for testing a number of samples within few seconds. See link below:
https://m.youtube.com/watch?v=EZ8-2-Wj3tc
Or contact me for instrument
Hi
Can we sourly say that a semiconductor is always n type or p type?or it is dependent on the synthesis method?
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