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Origin of unusual work function change upon forming Tl nanoclusters on Si(111)-7x7 surface

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Abstract

We report an unusual behavior of the work function that remains unchanged while increasing the coverage (θ) of thallium (Tl) nanoclusters regularly arranged on a Si(111)-7×7 surface. Such a constant work function with increasing θ is understood in terms of a θ-dependent inter-cluster interaction that cancels the change induced by dipoles due to Tl nanoclusters. The spectral changes of Si 2p and Tl 5d5/2 core-levels as a function of θ strongly indicates the presence of such an inter-clusters interaction, which is further supported by our theoretical calculation revealing a significant charge redistribution.

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Authors and Affiliations

  1. Department of Physics, Pohang University of Science and Technology, Pohang, 790-784, Korea

    C.G. Hwang, N.D. Kim, G. Lee, S.Y. Shin, S.H. Uhm, H.S. Kim, J.S. Kim & J.W. Chung

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  1. C.G. Hwang
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  2. N.D. Kim
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  3. G. Lee
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  4. S.Y. Shin
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  5. S.H. Uhm
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  6. H.S. Kim
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  7. J.S. Kim
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  8. J.W. Chung
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Correspondence to J.W. Chung.

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PACS

73.20.-r; 73.30.+y; 68.47.Fg; 79.60.-i; 73.20.Hb

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Hwang, C., Kim, N., Lee, G. et al. Origin of unusual work function change upon forming Tl nanoclusters on Si(111)-7x7 surface. Appl. Phys. A 89, 431–435 (2007). https://doi.org/10.1007/s00339-007-4238-8

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  • DOI: https://doi.org/10.1007/s00339-007-4238-8

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