Hi everyone
what is different between optical and electrical bandgap
is there a relation between them ?
can introduce me some book about it ?
I found a few resources that you might find useful.
https://www.researchgate.net/post/What_is_the_basic_difference_between_optical_band_gap_and_electrical_band_gap
https://en.wikipedia.org/wiki/Band_gap#Optical_versus_electronic_bandgap
Hopefully these provide the insight you are looking for.
https://www.researchgate.net/post/What_is_the_basic_difference_between_optical_band_gap_and_electrical_band_gap/1
I don't know If ready this or not but I found it very useful
Essentially, in both cases we consider a wavefunction in a periodic potential
The optical band gap is the threshold for photons to be absorbed, while the transport gap is the threshold for creating an electron–hole pair that is not bound together. (The optical band gap is at a lower energy than the transport gap.)
In almost all inorganic semiconductors, such as silicon, gallium arsenide, etc., there is very little interaction between electrons and holes (very small exciton binding energy), and therefore the optical and electronic band gap are essentially identical, and the distinction between them is ignored. However, in some systems, including organic semiconductors, the distinction may be significant.
https://en.wikipedia.org/wiki/Band_gap#Optical_versus_electronic_bandgap
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