Browsing by Subject "nanoperforated membranes"

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The impact of nanoperforation on persistent photoconductivity and optical quenching effects in suspended GaN nanomembranes

VOLCIUC, Olesea; BRANISTE, Tudor; TIGINYANU, Ion; STEVENS-KALCEFF, Marion A.; EBELING, Jakob; ASCHENBRENNER, Timo; HOMMEL, Detlef; URSAKI, Veaceslav; GUTOWSKI, Jürgen (AIP Publishing LLC, 2013)

We report on fabrication of suspended ~15 nm thick GaN membranes nanoperforated in an ordered fashion using direct writing of negative charges by focused ion beam and subsequent photoelectrochemical etching of GaN epilayers. ...
The Impact of the Discreteness of Low-fluence Ion Beam Processing on the Spatial Architecture of GaN Nanostructures Fabricated by Surface Charge Lithography

TIGINYANU, I. M.; VOLCIUC, O.; STEVENS-KALCEFF, M. A.; POPA, V.; GUTOWSKI, J.; WILLE, S.; ADELUNG, R.; FOLL, H. (Academia de Ştiinţe a Moldovei, 2013)

We show that the descrete nature of ion beam processing used as a component in the approach of surface charge lithography leads to spatial modulation of the edges of the GaN nanostructures such as nanobelts and nanoperforated ...
Optoelectronic properties of gallium nitride thin membranes

BRANISTE, Tudor; POPA, Veaceslav; VOLCIUC, Olesea; TIGINYANU, Ion (Romanian Academy, 2015)

We present the results of a systematic study of persistent photoconductivity (PPC) generated by UV-excitation in thin membranes based on crystalline GaN. The PPC was found to be optically quenched under extrinsic excitation ...

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