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Choi J, Choi MJ, Kim J, et al. Stabilizing Surface Passivation Enables Stable Operation of Colloidal Quantum Dot Photovoltaic Devices at Maximum Power Point in an Air Ambient. Adv Mater. 2020;32(7):e1906497doi: 10.1002/adma.201906497.
Choi, J., Choi, M. J., Kim, J., Dinic, F., Todorovic, P., Sun, B., Wei, M., Baek, S. W., Hoogland, S., García de Arquer, F. P., Voznyy, O., & Sargent, E. H. (2020). Stabilizing Surface Passivation Enables Stable Operation of Colloidal Quantum Dot Photovoltaic Devices at Maximum Power Point in an Air Ambient. Advanced materials (Deerfield Beach, Fla.), 32(7), e1906497. https://doi.org/10.1002/adma.201906497
Choi, Jongmin, et al. "Stabilizing Surface Passivation Enables Stable Operation of Colloidal Quantum Dot Photovoltaic Devices at Maximum Power Point in an Air Ambient." Advanced materials (Deerfield Beach, Fla.) vol. 32,7 (2020): e1906497. doi: https://doi.org/10.1002/adma.201906497
Choi J, Choi MJ, Kim J, Dinic F, Todorovic P, Sun B, Wei M, Baek SW, Hoogland S, García de Arquer FP, Voznyy O, Sargent EH. Stabilizing Surface Passivation Enables Stable Operation of Colloidal Quantum Dot Photovoltaic Devices at Maximum Power Point in an Air Ambient. Adv Mater. 2020 Feb;32(7):e1906497. doi: 10.1002/adma.201906497. Epub 2020 Jan 13. PMID: 31930771.
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Adv Mater. 2020 Feb;32(7):e1906497. doi: 10.1002/adma.201906497. Epub 2020 Jan 13.

Stabilizing Surface Passivation Enables Stable Operation of Colloidal Quantum Dot Photovoltaic Devices at Maximum Power Point in an Air Ambient.

Advanced materials (Deerfield Beach, Fla.)

Jongmin Choi, Min-Jae Choi, Junghwan Kim, Filip Dinic, Petar Todorovic, Bin Sun, Mingyang Wei, Se-Woong Baek, Sjoerd Hoogland, F Pelayo García de Arquer, Oleksandr Voznyy, Edward H Sargent

Affiliations

  1. Department of Electrical and Computer Engineering, University of Toronto, 10 King's College Road, Toronto, Ontario, M5S 3G4, Canada.
  2. Department of Physical and Environmental Sciences, University of Toronto, 1065, Military Trail, Toronto, Ontario, M1C 1A4, Canada.

PMID: 31930771 DOI: 10.1002/adma.201906497

Abstract

Colloidal quantum dots (CQDs) are promising materials for photovoltaic (PV) applications owing to their size-tunable bandgap and solution processing. However, reports on CQD PV stability have been limited so far to storage in the dark; or operation illuminated, but under an inert atmosphere. CQD PV devices that are stable under continuous operation in air have yet to be demonstrated-a limitation that is shown here to arise due to rapid oxidation of both CQDs and surface passivation. Here, a stable CQD PV device under continuous operation in air is demonstrated by introducing additional potassium iodide (KI) on the CQD surface that acts as a shielding layer and thus stands in the way of oxidation of the CQD surface. The devices (unencapsulated) retain >80% of their initial efficiency following 300 h of continuous operation in air, whereas CQD PV devices without KI lose the amount of performance within just 21 h. KI shielding also provides improved surface passivation and, as a result, a higher power conversion efficiency (PCE) of 12.6% compared with 11.4% for control devices.

© 2020 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

Keywords: colloidal quantum dots; continuous operation; device stability; oxidation; solar cells

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