ZnO characterisation under constant current

  • #1

chpolyz

6
0
As ZnO is a semiconductor with a typical resistivity of ρ ~ 10^5 Ωcm, I tried to find the settling time during measurements.

If I impose a low-level constant current (as a source), I expect a transient phenomenon (of few tens of seconds) and then a constant state while measuring Voltage to time.

Yet, what I see is a decrease in the measured voltage after its expected rise. Could somebody explain why a fall in Voltage happens and the change of its sign (from positive to negative and vice versa later on, like in the V-t plot)?
 
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  • #2
I'm guessing that you're separating the oxygen out through electrolysis.
 
  • #3
My sample is a thin film. I do not thing it has to do with electrolysis. I used 2 probes for the current and 2 other for voltage measurement. All of them on the periphery of the sample.
 

1. What is the purpose of characterizing ZnO under constant current?

The purpose of characterizing ZnO under constant current is to understand its electrical properties and behavior at a steady flow of current. This allows for a more accurate and controlled analysis of the material's conductivity and other relevant factors.

2. How is constant current applied during ZnO characterization?

Constant current is applied by passing a steady flow of electrical charge through the ZnO material. This can be achieved using a power source such as a battery or generator, and the current can be measured using an ammeter.

3. What are the key parameters to consider when characterizing ZnO under constant current?

The key parameters to consider include the applied current, the voltage across the material, the temperature, and the duration of the experiment. These factors can greatly influence the results and should be carefully controlled and monitored.

4. What techniques can be used for ZnO characterization under constant current?

Some commonly used techniques for ZnO characterization under constant current include current-voltage measurements, impedance spectroscopy, and cyclic voltammetry. These methods provide valuable information about the material's electrical properties and behavior.

5. What can be learned from ZnO characterization under constant current?

ZnO characterization under constant current can provide insights into the material's conductivity, charge transport mechanisms, and other relevant properties. This information is crucial for understanding the material's potential applications in various fields such as electronics, optoelectronics, and energy storage.

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