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Single-step fabrication of quantum funnels via centrifugal colloidal casting of nanoparticle films

Author

Listed:
  • Jin Young Kim

    (University of Toronto
    Fuel Cell Research Center, Korea Institute of Science and Technology)

  • Valerio Adinolfi

    (University of Toronto)

  • Brandon R. Sutherland

    (University of Toronto)

  • Oleksandr Voznyy

    (University of Toronto)

  • S. Joon Kwon

    (Nanophotonics Research Center, Korea Institute of Science and Technology)

  • Tae Wu Kim

    (Center for Nanomaterials and Chemical Reactions, Institute for Basic Science
    Korea Advanced Institute of Science and Technology)

  • Jeongho Kim

    (Inha University)

  • Hyotcherl Ihee

    (Center for Nanomaterials and Chemical Reactions, Institute for Basic Science
    Korea Advanced Institute of Science and Technology)

  • Kyle Kemp

    (University of Toronto)

  • Michael Adachi

    (University of Toronto)

  • Mingjian Yuan

    (University of Toronto)

  • Illan Kramer

    (University of Toronto)

  • David Zhitomirsky

    (University of Toronto)

  • Sjoerd Hoogland

    (University of Toronto)

  • Edward H. Sargent

    (University of Toronto)

Abstract

Centrifugal casting of composites and ceramics has been widely employed to improve the mechanical and thermal properties of functional materials. This powerful method has yet to be deployed in the context of nanoparticles—yet size–effect tuning of quantum dots is among their most distinctive and application-relevant features. Here we report the first gradient nanoparticle films to be constructed in a single step. By creating a stable colloid of nanoparticles that are capped with electronic-conduction-compatible ligands we were able to leverage centrifugal casting for thin-films devices. This new method, termed centrifugal colloidal casting, is demonstrated to form films in a bandgap-ordered manner with efficient carrier funnelling towards the lowest energy layer. We constructed the first quantum-gradient photodiode to be formed in a single deposition step and, as a result of the gradient-enhanced electric field, experimentally measured the highest normalized detectivity of any colloidal quantum dot photodetector.

Suggested Citation

  • Jin Young Kim & Valerio Adinolfi & Brandon R. Sutherland & Oleksandr Voznyy & S. Joon Kwon & Tae Wu Kim & Jeongho Kim & Hyotcherl Ihee & Kyle Kemp & Michael Adachi & Mingjian Yuan & Illan Kramer & Dav, 2015. "Single-step fabrication of quantum funnels via centrifugal colloidal casting of nanoparticle films," Nature Communications, Nature, vol. 6(1), pages 1-9, November.
    • Handle: RePEc:nat:natcom:v:6:y:2015:i:1:d:10.1038_ncomms8772
    DOI: 10.1038/ncomms8772
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    Cited by:

    1. Jing Liu & Peilin Liu & Tailong Shi & Mo Ke & Kao Xiong & Yuxuan Liu & Long Chen & Linxiang Zhang & Xinyi Liang & Hao Li & Shuaicheng Lu & Xinzheng Lan & Guangda Niu & Jianbing Zhang & Peng Fei & Lian, 2023. "Flexible and broadband colloidal quantum dots photodiode array for pixel-level X-ray to near-infrared image fusion," Nature Communications, Nature, vol. 14(1), pages 1-9, December.

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