How to find conduction and valence band effective density of states value in cm-3 from density of states graph given in eV?
How do we relate thickness and bandgap of the active layer from the given UV-absorption graph?
To find the effective density of states (DOS) values in cm-3 from a density of states graph given in eV, you need to consider the energy range corresponding to the conduction and valence bands. The effective density of states is typically defined as the number of energy states per unit energy per unit volume. Here's how you can approach it:
The specific conversion factor will depend on the dimensionality of the material (e.g., bulk, thin film) and the effective mass model used. For example, for a bulk material, you can use the formula:
Effective DOS (cm-3) = Density of states per unit energy × Conversion factor
The conversion factor will include terms like the volume of the material, Avogadro's number, and other constants.
Regarding the relationship between thickness and bandgap of the active layer from a given UV-absorption graph, it's important to note that the UV-absorption graph provides information about the absorption properties of the material as a function of energy (wavelength).
By examining the UV-absorption graph, you can observe the wavelength or energy corresponding to the onset of absorption. This wavelength or energy value would correspond to the bandgap energy of the active layer. Additionally, the graph can provide information about the absorption behavior at different energies or wavelengths, indicating the material's absorption characteristics in the UV range.
Keep in mind that the relationship between thickness and bandgap in the active layer is not explicitly provided by the UV-absorption graph. The graph primarily informs you about the material's absorption behavior, while the thickness and bandgap are separate material parameters that influence light absorption.
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