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The optical and electrical properties of silicon quantum dots are calculated using effective mass theory and tight binding method. The bandgap and intersubband gap energies as well as the tunnelling transmission probability of silicon quantum dots embedded in an amorphous silicon nitride are calculated for different Si/N ratios. Optical absorption spectra are calculated using tight binding method...
We use a patterned conformal deposition technique to fabricate Si-based 3D optical microcavities. The size-dependent confined photonic modes were observed when the size is reduced to 1.0 mum which is similar to the quantum effect of electronic states in semiconductor quantum dots.
The tandem stack of cells is one of the promising approaches for using a full solar spectrum and improving solar cell performance. By restricting the dimensions of silicon to less than Bohr radius of bulk crystalline silicon (~5 nm), quantum confinement causes its effective bandgap to increase. Therefore silicon quantum dot superlattice can be a good candidate for realizing all silicon tandem solar...
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