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Cascade surface modification of colloidal quantum dot inks enables efficient bulk homojunction photovoltaics

Author

Listed:
  • Min-Jae Choi

    (University of Toronto)

  • F. Pelayo García de Arquer

    (University of Toronto)

  • Andrew H. Proppe

    (University of Toronto
    University of Toronto)

  • Ali Seifitokaldani

    (University of Toronto)

  • Jongmin Choi

    (University of Toronto)

  • Junghwan Kim

    (University of Toronto)

  • Se-Woong Baek

    (University of Toronto)

  • Mengxia Liu

    (University of Toronto)

  • Bin Sun

    (University of Toronto)

  • Margherita Biondi

    (University of Toronto)

  • Benjamin Scheffel

    (University of Toronto)

  • Grant Walters

    (University of Toronto)

  • Dae-Hyun Nam

    (University of Toronto)

  • Jea Woong Jo

    (University of Toronto)

  • Olivier Ouellette

    (University of Toronto)

  • Oleksandr Voznyy

    (University of Toronto)

  • Sjoerd Hoogland

    (University of Toronto)

  • Shana O. Kelley

    (University of Toronto
    University of Toronto)

  • Yeon Sik Jung

    (Korea Advanced Institute of Science and Technology (KAIST))

  • Edward. H. Sargent

    (University of Toronto)

Abstract

Control over carrier type and doping levels in semiconductor materials is key for optoelectronic applications. In colloidal quantum dots (CQDs), these properties can be tuned by surface chemistry modification, but this has so far been accomplished at the expense of reduced surface passivation and compromised colloidal solubility; this has precluded the realization of advanced architectures such as CQD bulk homojunction solids. Here we introduce a cascade surface modification scheme that overcomes these limitations. This strategy provides control over doping and solubility and enables n-type and p-type CQD inks that are fully miscible in the same solvent with complete surface passivation. This enables the realization of homogeneous CQD bulk homojunction films that exhibit a 1.5 times increase in carrier diffusion length compared with the previous best CQD films. As a result, we demonstrate the highest power conversion efficiency (13.3%) reported among CQD solar cells.

Suggested Citation

  • Min-Jae Choi & F. Pelayo García de Arquer & Andrew H. Proppe & Ali Seifitokaldani & Jongmin Choi & Junghwan Kim & Se-Woong Baek & Mengxia Liu & Bin Sun & Margherita Biondi & Benjamin Scheffel & Grant , 2020. "Cascade surface modification of colloidal quantum dot inks enables efficient bulk homojunction photovoltaics," Nature Communications, Nature, vol. 11(1), pages 1-9, December.
    • Handle: RePEc:nat:natcom:v:11:y:2020:i:1:d:10.1038_s41467-019-13437-2
    DOI: 10.1038/s41467-019-13437-2
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    Cited by:

    1. Akihiro Takahashi & Haibin Wang & Takeshi Fukuda & Norihiko Kamata & Takaya Kubo & Hiroshi Segawa, 2020. "Annealing-Temperature Dependent Carrier-Transportation in ZnO/PbS Quantum Dot Solar Cells Fabricated Using Liquid-Phase Ligand Exchange Methods," Energies, MDPI, vol. 13(19), pages 1-11, September.

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