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Langmuir-Schaefer deposition of 2D PbS quantum dot superlattices with millimetre square coverage

Author

Listed:
  • Jacopo Pinna

    (University of Groningen)

  • Alexandru Mednicov

    (University of Groningen)

  • Razieh Mehrabi Koushki

    (University of Groningen)

  • Majid Ahmadi

    (University of Groningen)

  • José Ruiz-Franco

    (University of Groningen)

  • Andrea Giuntoli

    (University of Groningen)

  • Bart J. Kooi

    (University of Groningen)

  • Giuseppe Portale

    (University of Groningen)

  • Maria Antonietta Loi

    (University of Groningen)

Abstract

Superlattices of lead chalcogenide colloidal quantum dots hold promise to revolutionise the field of infrared optoelectronics due to their unique combination of optical and transport properties. However, the main challenge remains to form a homogeneous thin-film with long-range order avoiding cracking upon ligand exchange. To overcome these issues, we introduce an approach where external lateral pressure is applied during the self-assembly and ligand exchange, thus avoiding the formation of cracks due to volume shrinking. The formed monolayer superlattices are crack-free over several millimetres square. Transport measurements in an ionic gel-gated field-effect transistor reveal that increasing the external pressure during the superlattice formation leads to higher electron mobilities above 25 cm2V−1s−1 thanks to better compactness, high ordering, and a higher number of nearest neighbours. These results demonstrate that colloidal quantum dot superlattices with high charge mobility can be fabricated over large areas with important implications for technological applications.

Suggested Citation

  • Jacopo Pinna & Alexandru Mednicov & Razieh Mehrabi Koushki & Majid Ahmadi & José Ruiz-Franco & Andrea Giuntoli & Bart J. Kooi & Giuseppe Portale & Maria Antonietta Loi, 2025. "Langmuir-Schaefer deposition of 2D PbS quantum dot superlattices with millimetre square coverage," Nature Communications, Nature, vol. 16(1), pages 1-13, December.
    • Handle: RePEc:nat:natcom:v:16:y:2025:i:1:d:10.1038_s41467-025-64065-y
    DOI: 10.1038/s41467-025-64065-y
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    References listed on IDEAS

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    1. Angang Dong & Jun Chen & Patrick M. Vora & James M. Kikkawa & Christopher B. Murray, 2010. "Binary nanocrystal superlattice membranes self-assembled at the liquid–air interface," Nature, Nature, vol. 466(7305), pages 474-477, July.
    2. Ricky Dwi Septianto & Retno Miranti & Tomoka Kikitsu & Takaaki Hikima & Daisuke Hashizume & Nobuhiro Matsushita & Yoshihiro Iwasa & Satria Zulkarnaen Bisri, 2023. "Enabling metallic behaviour in two-dimensional superlattice of semiconductor colloidal quantum dots," Nature Communications, Nature, vol. 14(1), pages 1-10, December.
    3. Kathryn A. Whitaker & Zsigmond Varga & Lilian C. Hsiao & Michael J. Solomon & James W. Swan & Eric M. Furst, 2019. "Colloidal gel elasticity arises from the packing of locally glassy clusters," Nature Communications, Nature, vol. 10(1), pages 1-8, December.
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