Dresden 2011 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 87: ZnO: Growth and Defects

HL 87.6: Vortrag

Freitag, 18. März 2011, 11:30–11:45, POT 51

(contribution withdrawn) Metastable state of the V_ZnH₂ defect in ZnO — •Dirk Bastin, Edward Lavrov, and Jörg Weber — Technische Universität Dresden, 01062 Dresden, Germany

The Zn vacancy passivated by two hydrogen atoms in ZnO V_ZnH₂ was studied by IR absorption spectroscopy. It was shown that in addition to the ground state comprising two inequivalent O-H bonds aligned parallel and ’perpendicular’ to the c-axis of the crystal, there is a metastable state of the defect (V_ZnH₂^*). V_ZnH₂^* consists of two equivalent O-H bonds oriented ’perpendicular’ to the c-axis. The metastable state of the Zn vacancy decorated with two hydrogen atoms reveals two local vibration modes at 3329.0 and 3348.4 cm⁻¹ which represent antisymmetric and symmetric combinations of the two separate O-H stretch modes, respectively. The energy difference between the ground and the metastable states of the complex was found to be 75±9 meV. It was also established that the activation energy of the hydrogen motion within the Zn vacancy is 0.96±0.09 eV.