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HL: Halbleiterphysik

HL 9: Diamant

HL 9.3: Vortrag

Montag, 22. März 1999, 16:30–16:45, H3

Cathodoluminescence studies on the green 2.3 eV band in diamond — •N. Teofilov, K. Thonke, and R. Sauer — Abteilung Halbleiterphysik, Universit"at Ulm, 89069 Ulm

The broad so-called A-band luminescence in natural IIb and synthetic high-pressure high temperature(HPHT) diamond crystals was recently shown to consist of a green 2.3 eV band ascribed to the presence of boron and a blue 2.8 eV bound ascribed to dislocations. We have performed cathodoluminescence (CL) measurements on the 2.3 eV band varying the sample temperature from 20 K to 300 K. There are indications of several thermally activated processes competing with the recombination at 2.3 eV. Around room temperature, this band disappears being replaced by a novel band ≈ 0.2 eV higher in energy.