Wide InP superlattice wires with Wurtzite/Zincblende segments are type-II whereas narrower wires become type-I: An atomistic pseudopotential calculation
Mon, 2011-02-14 17:09 - Daniel Rudolph
Date:
2010-09-01
Reference:
Nanoletters 4055, 10 (2010)
Nanowire-superlattices with different structural phases along the nanowire direction, such as wurtzite (WZ) and zincblende (ZB) forms of the same compound, often exhibit a “type II” band-alignment with electrons on ZB and holes on WZ. This is a material property of most of III−V semiconductors. We show via InP nanowires that as the nanowire diameter decreases, quantum-confinement alters this basic material property, placing both electrons and holes on the same (ZB) phase. This structural design causes a dramatic increase in absorption strength and reduced radiative lifetime.
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