In general the band gap of any nano -photosemiconductoris decreased with the increasing of crystal size, but some time the bg is increased with increased a crystal size.Why?
It's better to rearrange the question in the form, "the energy gap depends on nanosize particles or crystals---"
the energy gap in semiconductors increase with the decrease of nano size a in the range of 100nm and down. But the major effect will begin at about 12nm and down to its crytical size
for mor details I recommend to read and see the following power point
"Solid Surface and Nanoscale materials Structure"
Presentation · July 2016 with 156 Reads
DOI: 10.13140/RG.2.2.31947.59684
Charmo, University of Charmo, University of Salahaddin, DOI:10.13140/RG.2.2.31947.59684
Yes, the width of the band gap decreases with increasing crystal size, this is due to electronic transitions between levels.
Dear Dr. All thanks a lot for you answers.
Dear Dr. Rishi Upadhyay , the quantum confinement phenomena is occurred at crystal size less 10 nm, and verse the role that say ''the bg increases with decreasing a nano crystal size".
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