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HL: Halbleiterphysik

HL 44: Poster II

HL 44.72: Poster

Donnerstag, 11. März 2004, 16:30–19:00, Poster A

Hydrogen-induced platelets in Ge — •Martin Hiller, Edward Lavrov, and Jörg Weber — Institut für Angewandte Physik - Halbleiterphysik, TU Dresden, 01062 Dresden

Germanium treated in hydrogen and/or deuterium plasmas has been investigated by means of Raman scattering at RT. Two Raman lines at ∼2000 and 4150 cm⁻¹ are observed after H-plasma treatment at 150^∘C. The former is identified as local vibrational modes (LVMs) of Ge–H bonds, whereas the latter was shown to originate from a LVM of H₂. Polarization Raman measurements revealed that both lines possess a trigonal symmetry. Based on this and the similarity of the two signals in Ge and Si we identify the 2000 cm⁻¹ line as hydrogen-induced {111} platelets, whereas the 4150 cm⁻¹ line belongs to H₂ trapped within these platelets.