Zachary C. Holman and Uwe R. Kortshagen Quantum confinement in germanium nanocrystal thin films physica status solidi (RRL) - Rapid Research Letters 5
In this Letter, the optical band gaps of dense films of germanium nanocrystals were determined from absorption spectra. By decreasing the constituent nanocrystal size from 9 nm to below 5 nm, the film band gap can be controllably tuned from 0.73 to over 1.0 eV. These values are comparable to those reported for isolated, non-interacting germanium nanocrystals, indicating that device-relevant films can be deposited without loss of quantum confinement.
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