4.8 Article

Wide InP Nanowires with Wurtzite/Zincblende Superlattice Segments Are Type-II whereas Narrower Nanowires Become Type-I: An Atomistic Pseudopotential Calculation

Journal

NANO LETTERS
Volume 10, Issue 10, Pages 4055-4060

Publisher

AMER CHEMICAL SOC
DOI: 10.1021/nl102109s

Keywords

Electron-hole separation; nanowire superlattice; type II-type I transition

Funding

  1. U S Department of Energy. Office of Basic Energy Science, Division of Materials Sciences and Engineering [DE-AC36-08G028308]

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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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