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Mixed-dimensional stacked nanocomposite structures for a specific wavelength-selectable ambipolar photoresponse

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Abstract

Mixed-dimensional composite structures using zero-dimensional (0D) quantum dots (QDs) and two-dimensional (2D) transition metal dichalcogenides (TMDs) materials are expected to attract great interest in optoelectronics due to the potential to generate new optical properties. Here, we report on the unique optical characteristics of a devices with mixed dimensional vertically stacked structures based on tungsten diselenide (WSe2)/CdSeS QDs monolayer/molybdenum disulfide (MoS2) (2D/0D/2D). Specifically, it exhibits an ambipolar photoresponse characteristic, with a negative photoresponse observed in the 400–600 nm wavelength range and a positive photoresponse appeared at 700 nm wavelength. It resulted in the high negative responsivity of up to 52.22 mA·W−1 under 400 nm, which is 163 times higher than that of the photodetector without CdSeS QDs. We also demonstrated the negative photoresponse, which could be due to increased carrier collision probability and non-radiative recombination. Device modeling and simulation reveal that Auger recombination among the types of non-radiative recombination is the main cause of negative photocurrent generation. Consequently, we discovered ambipolar photoresponse near a specific wavelength corresponding to the energy of quantum dots. Our study revealed interesting phenomenon in the mixed low-dimensional stacked structure and paved the way to exploit it for the development of innovative photodetection materials as well as for optoelectronic applications.

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Acknowledgments

This work was supported by the financial support from the KIST Institution Program (No. 2E32634) and Basic Science Research Program through the National Research Foundation of Korea (NRF) grant funded by the Korea government (Ministry of Science and ICT) (Nos. NRF-2017R1A2B3002307 and NRF-2016M3A7B4900135). This research was also supported by Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education (No. NRF-2020R1A6A3A01099388) and the National R&D Program through the National Research Foundation of Korea (NRF) funded by Ministry of Science and ICT (Nos. NRF-2022M3H4A1A04074153 and RS-2023-00239634).

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Author notes

  1. Young Jae Park and Jaeho Shim contributed equally to this work.

Authors and Affiliations

  1. Institute of Advanced Composite Materials, Korea Institute of Science and Technology, Jeollabuk-do, 55324, Republic of Korea

    Young Jae Park, Jaeho Shim, Joo Song Lee, Kyu Seung Lee, Ji-Yeon Kim & Dong Ick Son

  2. National Institute for Nanomaterials Technology, Pohang University of Science and Technology, Gyeongsangbuk-do, 37673, Republic of Korea

    Young Jae Park, Seongjun Kim & Hoon-Kyu Shin

  3. Department of Semiconductor Science and Technology, Semiconductor Physics Research Center, Jeonbuk National University, Jeonju, 54896, Republic of Korea

    Kang Bok Ko

  4. Advanced Photonics Research Institute, Gwangju Institute of Science and Technology, Gwangju, 61005, Republic of Korea

    Sang-Youp Yim

  5. Center for Opto-Electronic Materials and Devices, Post-Silicon Semiconductor Institute, Korea Institute of Science and Technology, Seoul, 02792, Republic of Korea

    Donghee Park

  6. Graduate School of Energy and Environment (KU-KIST Green School), Korea University, Seoul, 02841, Republic of Korea

    Yong Ju Yun

  7. KIST School, Department of Nanomaterials and Nano Science, University of Science and Technology (UST), Daejeon, 34113, Republic of Korea

    Dong Ick Son

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  1. Young Jae Park
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  10. Donghee Park
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Correspondence to Dong Ick Son.

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Park, Y.J., Shim, J., Lee, J.S. et al. Mixed-dimensional stacked nanocomposite structures for a specific wavelength-selectable ambipolar photoresponse. Nano Res. 17, 5549–5558 (2024). https://doi.org/10.1007/s12274-024-6422-y

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  • DOI: https://doi.org/10.1007/s12274-024-6422-y

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