A recently developed non-conventional tight-binding method was applied in combination with molecular dynamics to compute the geometric structures and cohesion energies of small stable pure Si clusters containing from 3 to 8 atoms, in neutral, positive and negative charge states. The influence of the charge state on the cluster configuration and cohesion energy is considered. The Anderson U(-) effect is observed in Si3 - Si5 clusters. Doubly positively charged states are found to be the most energetically stable form for all clusters considered. The results computed with this semiempirical approach are compared to predictions from state-of-the-art ab initio methods.

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