AVS 47th International Symposium
    Semiconductors Tuesday Sessions
       Session SC+EL+OF-TuA

Paper SC+EL+OF-TuA6
Formation and Reaction of Organic Layers on Germanium: Reaction of 1,5-cyclooctadiene with the Ge(100) Surface

Tuesday, October 3, 2000, 3:40 pm, Room 306

Session: Organic Chemistry on Semiconductor Surfaces
Presenter: C.M. Greenlief, University of Missouri, Columbia
Authors: P. Prayongpan, University of Missouri, Columbia
D.S. Stripe, University of Missouri, Columbia
C.M. Greenlief, University of Missouri, Columbia
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Organic alkenes can bond to Ge(100) surfaces to produce monolayer organic films that are chemically homogeneous and structurally ordered. The bonding of these molecules to the Ge(100)-(2x1) reconstructed surface is analogous to a class of ring-forming reactions known in organic chemistry as [2+2] cycloaddition reactions. While the bulk reactions involve the reaction of two alkene groups to form a four-member ring, the analogous surface reaction involves two electrons from the organic alkene and two electrons from the surface Ge=Ge dimers. Here, the formation of ordered organic layers on Ge(100) substrates is examined by the reaction of 1,5-cycloocatadiene with Ge(100). This molecule reacts with the Ge dimers leading to a [2+2] cycloaddition reaction product. A combination of ab initio calculations and surface sensitive experimental techniques are used to probe the interactions. Surface modification of the organic layers is also explored. The reaction of the organic layers with atomic hydrogen and a series of alcohols will be discussed.