Cited 19 time in webofscience Cited 16 time in scopus

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

Title
Stabilizing Surface Passivation Enables Stable Operation of Colloidal Quantum Dot Photovoltaic Devices at Maximum Power Point in an Air Ambient
Authors
Choi, JongminChoi, Min-JaeKim, JunghwanDinic, FilipTodorovic, PetarSun, BinWei, MingyangBaek, Se-WoongHoogland, Sjoerdde Arquer, F. Pelayo GarciaVoznyy, OleksandrSargent, Edward H.
DGIST Authors
Choi, Jongmin; Choi, Min-Jae; Kim, Junghwan; Dinic, Filip; Todorovic, Petar; Sun, Bin; Wei, Mingyang; Baek, Se-Woong; Hoogland, Sjoerd; de Arquer, F. Pelayo Garcia; Voznyy, Oleksandr; Sargent, Edward H.
Issue Date
2020-02
Citation
Advanced Materials, 32(7), 1906497
Type
Article
Article Type
Article; Early Access
Author Keywords
colloidal quantum dotscontinuous operationdevice stabilityoxidationsolar cells
Keywords
DIFFUSIONEFFICIENTPBS
ISSN
0935-9648
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.
URI
http://hdl.handle.net/20.500.11750/11422
DOI
10.1002/adma.201906497
Publisher
Wiley-VCH Verlag
Related Researcher
  • Author Choi, Jongmin Chemical & Energy Materials Engineering (CEME) Laboratory
  • Research Interests Advanced Metal Oxides; Colloidal Quantum Dots; Perovskite-Quantum Dot Hybrid Nanomaterials; Photocatalytic Materials
Files:
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Collection:
Department of Energy Science and EngineeringChemical & Energy Materials Engineering (CEME) Laboratory1. Journal Articles


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