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

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• 作者：Lijun Zhang ; Jun-Wei Luo ; Alex Zunger ; Nika Akopian ; Val Zwiller ; Jean-Christophe Harmand
• 刊名：Nano Letters
• 出版年：2010
• 出版时间：October 13, 2010
• 年：2010
• 卷：10
• 期：10
• 页码：4055-4060
• 全文大小：475K
• 年卷期：v.10,no.10(October 13, 2010)
• ISSN：1530-6992

文摘

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.

Keywords:

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