Universidad de Valladolid

Universidad de Valladolid

The curious case of thin-body Ge crystallization

R. Duffy, M. Shayesteh, B. McCarthy, A. Blake, M. White, J. Scully, R. Yu, A.-M. Kelleher, M. Schmidt, N. Petkov, L. Pelaz and L. A. Marqués

Applied Physics Letters 99, 131901 (2011)


The authors investigate the templated crystallization of thin-body Ge fin structures with high aspect ratios. Experimental variables include fin thickness and thermal treatments, with fin structures oriented in the 〈110〉 direction. Transmission electron microscopy determined that various crystal defects form during crystallization of amorphous Ge regions, most notably {111} stacking faults, twin boundaries, and small crystallites. In all cases, the nature of the defects is dependent on the fin thickness and thermal treatments applied. Using a standard 600 °C rapid-thermal-anneal, Gestructures with high aspect ratios crystallize with better crystal quality and fewer uncured defects than the equivalent Si case, which is a cause for optimism for thin-film Ge devices.

DOI: 10.1063/1.3643160

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Funded by:

  • Science Foundation Ireland under Research Grant Nos. 09/SIRG/I1623 and 09/SIRG/I1621.