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Ultimate Charge Extraction of Monolayer PbS Quantum Dot for Observation of Multiple Exciton Generation

Title
Ultimate Charge Extraction of Monolayer PbS Quantum Dot for Observation of Multiple Exciton Generation
Authors
Park, So-YeonHan, SehoonKim, YounghoonJung, SoheeKim, Dong HoeHan, Gill SangJung, Hyun Suk
DGIST Authors
Kim, Younghoon
Issue Date
2019-10
Citation
ChemPhysChem, 20(20), 2657-2661
Type
Article
Article Type
Article
Author Keywords
colloid quantum dot solar cellfast charge extractionLangmuir-Blodgettmonolayer PbSmultiple exciton generation
Keywords
LANGMUIR-BLODGETTRECOMBINATIONEFFICIENCYARRAYS
ISSN
1439-4235
Abstract
Multiple exciton generation (MEG) has great potential to improve the Shockley-Queisser (S-Q) efficiency limitation for colloidal quantum dot (CQD) solar cells. However, MEG has rarely been observed in CQD solar cells because of the loss of carriers through the transport mechanism between adjacent QDs. Herein, we demonstrate that excess charge carriers produced via MEG can be efficiently extracted using monolayer PbS QDs. The monolayer PbS QDs solar cells exhibit α=1 in the light intensity dependence of the short-circuit current density Jsc (Jsc∝Iα) and an internal quantum efficiency (IQE) value of 100 % at 2.95 eV because of their very short charge extraction path. In addition, the measured MEG threshold is 2.23 times the bandgap energy (Eg), which is the lowest value in PbS QD solar cells. We believe that this approach can provide a simple method to find suitable CQD materials and design interface engineering for MEG. © 2019 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim
URI
http://hdl.handle.net/20.500.11750/10881
DOI
10.1002/cphc.201900381
Publisher
John Wiley & Sons Ltd.
Related Researcher
Files:
There are no files associated with this item.
Collection:
Division of Energy Technology1. Journal Articles


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