Journal
JOURNAL OF PHYSICS D-APPLIED PHYSICS
Volume 42, Issue 10, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0022-3727/42/10/105406
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- Regione Piemonte
- Universita degli Studi di Torino
- Italian MIUR
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Hydrogenated nonstoichiometric germanium materials have been produced by x-ray-activated chemical vapour deposition from germane, GeH4. The optical gap, Tauc slope and Urbach energy have been obtained from UV-Vis spectra and correlated with structural parameters, considered as a measure of short and intermediate order, calculated by Raman spectra. The results show that the structural disorder increases with the irradiation time. Investigation of the hydrogen local bonding configuration demonstrates a correlation between the variation of the relative abundances of GeH, GeH2 and GeH3 groups and both structural parameters and E-opt value. Moreover, evidence of the crucial role played by the increase in the GeH3 group abundance in the determination of the Eopt value was revealed.
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