What Are The Different Methods For Measuring The Band Gap Of CdSe?

There are several methods for measuring the band gap of CdSe, including:

1. Optical absorption spectroscopy: This method measures the amount of light absorbed by the material at different wavelengths. The band gap can be determined from the onset of absorption, which corresponds to the energy required to excite an electron from the valence band to the conduction band.

2. Photoluminescence spectroscopy: This technique involves exciting the material with light and measuring the emitted light. The energy of the emitted light corresponds to the band gap.

3. Electrochemical impedance spectroscopy: This method measures the electrical resistance of the material as a function of frequency. The band gap can be determined from the frequency corresponding to the maximum impedance.

4. Photoconductivity measurements: This technique measures the change in electrical conductivity of the material when it is exposed to light. The band gap can be determined from the onset of photoconductivity.

Each of these methods has its advantages and disadvantages, and the choice of method may depend on factors such as the sample size, sensitivity, and accuracy required.