Sample interview questions: How do you approach investigating the charge carrier mobility in organic semiconductors?
Sample answer:
Experimental Techniques for Investigating Charge Carrier Mobility in Organic Semiconductors:
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Time-of-Flight (TOF) Method:
- Involves applying a voltage pulse to a sample and measuring the time it takes for charge carriers to reach a detector located at the other end.
- Mobility is calculated using the drift velocity and the applied electric field.
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Field-Effect Transistor (FET) Method:
- Fabricates organic FET devices with known channel dimensions and gate electrode.
- Measures the drain current as a function of gate voltage and extracts the mobility from the slope of the linear region of the transfer curve.
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Space-Charge Limited Current (SCLC) Method:
- Involves injecting charge into a sample and measuring the current as a function of voltage.
- Mobility is determined by fitting the current-voltage data to a suitable model that accounts for space-charge effects.
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Photoconductivity Method:
- Illuminates a sample with light to generate charge carriers.
- Measures the conductivity change due to the increase in mobile charge density.
- Mobility is… Read full answer
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