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Photoresponse and Field Effect Transport Studies in InAsP–InP Core–Shell Nanowires

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Abstract

A ternary InAsyP1−y alloy is suitable for an application to near-infrared (NIR) optical devices as their direct bandgap energy covers the entire NIR band. A nanowire (NW) system allows an epitaxial integration of InAsyP1−y alloy on any type of substrate since the lattice mismatch strain can be relieved through the NW sidewall. Nevertheless, the very large surface to volume ratio feature of the NWs leads to enormous surface states which are susceptible to surface recombination of free carriers. Here, ternary InAs0.75P0.25 NWs are grown with InP passivation layer (i.e., core–shell structure) to minimize the influence of the surface states, thus increasing their optical and electrical properties. A photoresponse study was achieved through the modeled band structure of the grown NWs. The model and experimental results suggest that 5-nm-thick InP shell efficiently passivates the surface states of the InAs0.75P0.25 NWs. The fabricated core–shell photodetectors and field-effect transistors exhibit improved photoresponse and transport properties compared to its counterpart core-only structure.

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Acknowledgements

This work was supported by the National Research Foundation of Korea (NRF-2017R1C1B2010906 and NRF-2017M1A2A2048904) and was a part of the project titled ‘Development of real-time measuring system of basic environment for the water quality monitoring of the aquaculture farm,’ funded by the Ministry of Oceans and Fisheries, Korea (No. 20150303).

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Authors and Affiliations

  1. Department of Physics, Yeungnam University, Gyeongsan, 712-749, Republic of Korea

    Rochelle Lee, Min Hyeok Jo & Jae Cheol Shin

  2. Advanced Instrumentation Institute, Korea Research Institute of Standards and Science (KRISS), Daejeon, 34113, Korea

    TaeWan Kim

  3. Korea Photonics Technology Institute (KOPTI), Gwangju, 61007, Republic of Korea

    Hyo Jin Kim & Doo Gun Kim

Authors
  1. Rochelle Lee
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  2. Min Hyeok Jo
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  3. TaeWan Kim
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  4. Hyo Jin Kim
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  5. Doo Gun Kim
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  6. Jae Cheol Shin
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Correspondence to Jae Cheol Shin.

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Lee, R., Jo, M.H., Kim, T. et al. Photoresponse and Field Effect Transport Studies in InAsP–InP Core–Shell Nanowires. Electron. Mater. Lett. 14, 357–362 (2018). https://doi.org/10.1007/s13391-018-0041-2

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  • DOI: https://doi.org/10.1007/s13391-018-0041-2

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