How do you approach investigating the charge carrier dynamics in organic semiconductors?

Sample interview questions: How do you approach investigating the charge carrier dynamics in organic semiconductors?

Sample answer:

Investigating Charge Carrier Dynamics in Organic Semiconductors

1. Time-Resolved Photoluminescence Spectroscopy: By exciting the sample with a short laser pulse and monitoring the subsequent decay of the photoluminescence, one can extract information about the exciton lifetime, diffusion, and charge separation processes.

2. Charge Extraction by Linearly Increasing Voltage (CELIV): This technique involves applying a linear voltage ramp to the sample while measuring the photocurrent. The voltage at which the current saturates provides insights into the mobility and lifetime of charge carriers.

3. Time-of-Flight (TOF) Measurements: The TOF method involves illuminating a thin film sample with a short light pulse and measuring the time it takes for charge carriers to traverse the film. This provides direct measurement of the mobility and diffusion coefficient of charge carriers.

4. Terahertz Spectroscopy: By subjecting the sample to a terahertz field, one can probe the optical conductivity and dielectric properties, which are influenced by the charge carrier dynamics.

5. Hall Effect Measurements: Hall effect measurements involve applying a magnetic field to the sample and mea… Read full answer

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