THE COMPLEXITY OF THE GROWTH AND OPTICAL PROPERTIES OF GERMANIUM NANOCLUSTERS

Min Han, Yanchun Gong, Jianxin Ma, Fengqi Liu and Guanghou Wang
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Min Han: Department of Physics and National Laboratory of Solid State Microstructures, Nanjing University, Nanjing 210093, China;
Yanchun Gong: Department of Physics and National Laboratory of Solid State Microstructures, Nanjing University, Nanjing 210093, China;
Jianxin Ma: Department of Physics and National Laboratory of Solid State Microstructures, Nanjing University, Nanjing 210093, China;
Fengqi Liu: Department of Physics and National Laboratory of Solid State Microstructures, Nanjing University, Nanjing 210093, China;
Guanghou Wang: Department of Physics and National Laboratory of Solid State Microstructures, Nanjing University, Nanjing 210093, China;

Surface Review and Letters (SRL), 1996, vol. 03, issue 01, 91-95

Abstract: Germanium nanoclusters are prepared by means of the inert-gas condensation method. The growth, coalescence, and aggregation processes are investigated by means of TEM. It is found that the clusters can be either nanocrystals or amorphous-like. Furthermore, during the deposition, they can either randomly land on surface, keep isolated and finally form a cluster-assembled uniform film or aggregate with fractal structures and then form porous film, depending on their preparation condition. Spectropho-tometric measurements are recorded for these samples at room temperature in the ultraviolet, visible, and near-IR region, and show obvious blueshift of the band gap as large as 1.0–2.0 eV in comparison with those for the bulk specimens, which may be related to the quantum-confinement effect.

Date: 1996
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DOI: 10.1142/S0218625X96000206

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