Freestanding spherical silicon nanocrystals: A model system for studying confined excitons

Goller, B.; Polisski, S.; Wiggers, H.; Kovalev, D.
July 2010
Applied Physics Letters;7/26/2010, Vol. 97 Issue 4, p041110
Academic Journal
We report on the light emitting properties of freestanding hydrogen-terminated spherical silicon nanocrystals. The nanocrystals exhibit size-dependent tunable light emission properties. Many light emission properties of this system are found to be very similar to those known for other systems containing silicon nanocrystals. However, we found specific emission properties of this system ascribed to the spherical shape of silicon nanocrystals and their spatial separation. We attributed all observations to the spatial confinement of excitons within the crystalline core of the indirect band gap silicon nanocrystals.


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