Affiliation:
1. Basra University of Oil & Gas
2. Lancaster University
3. East China Normal University
4. Warwick University
5. Shaanxi University of Science and Technology
Abstract
Internal quantum efficiency (IQE) is an important figure of merit for photoelectric applications. While the InAs core/shell (c/s) nanowire (NW) is a promising solution for efficient quantum emission, the relationship between the IQE and shell coating remains unclear. This Letter reports mid-infrared PL measurements on InAs/InGaAs, InAs/AlSb, and InAs/GaSb c/s NWs, together with bare InAs NWs as a reference. Analyses show that the IQE is depressed by a shell coating at 9 K but gets improved by up to approximately 50% for the InGaAs shell coating at 40 –140 K and up to approximately 20% beyond 110 K for the AlSb shell. The effect is ascribed not only to the crystal quality but more importantly to the radial band alignment. The result indicates the high-temperature IQE improvement of the type-I and type-II c/s NWs and the appropriateness of the mid-infrared PL analyses for narrow-gap NW evaluation.
Funder
National Natural Science Foundation of China
Science and Technology Commission of Shanghai Municipality
Youth Innovation Promotion Association of the Chinese Academy of Sciences
Subject
Atomic and Molecular Physics, and Optics
Cited by
2 articles.
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