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Remarkable Electrical Conductivity Increase and Pure Metallic Properties from Semiconducting Colloidal Nanocrystals by Cation Exchange for Solution-Processable Optoelectronic Applications

Author(s)
Yoon, Sang EunKim, YongjinKim, HyeongjunKwon, Hyo-GeunKim, UnjeongLee, Sang YeonPark, Ju HyunSeo, HyungtakKwak, Sang KyuKim, Sang-WookKim, Jong H.
Issued Date
2023-06
DOI
10.1002/smll.202207511
URI
https://scholarworks.unist.ac.kr/handle/201301/64006
Citation
SMALL, v.19, no.23, pp.2207511
Abstract
The authors report a strategic approach to achieve metallic properties from semiconducting Cu-Fe-S colloidal nanocrystal (NC) solids through cation exchange method. An unprecedentedly high electrical conductivity is realized by the efficient generation of charge carriers onto a semiconducting Cu-S NC template via minimal Fe exchange. An electrical conductivity exceeding 10 500 S cm(-1) (13 400 S cm(-1) at 2 K) and a sheet resistance of 17 omega/sq at room temperature, which are among the highest values for solution-processable semiconducting NCs, are achieved successfully from bornite-phase Cu-Fe-S NC films possessing 10% Fe atom. The temperature dependence of the corresponding films exhibits pure metallic characteristics. Highly conducting NCs are demonstrated for a thermoelectric layer exhibiting a high power factor over 1.2 mW m(-1)K(-2) at room temperature, electrical wires for switching on light emitting diods (LEDs), and source-drain electrodes for p- and n-type organic field-effect transistors. Ambient stability, eco-friendly composition, and solution-processability further validate their sustainable and practical applicability. The present study provides a simple but very effective method for significantly increasing charge carrier concentrations in semiconducting colloidal NCs to achieve metallic properties, which is applicable to various optoelectronic devices.
Publisher
WILEY-V C H VERLAG GMBH
ISSN
1613-6810
Keyword (Author)
cation exchangecolloidal nanocrystalselectrical conductivitysemiconductor-to-metal transitionthermoelectric devices
Keyword
BAND-LIKE TRANSPORTSELENIDE NANOCRYSTALSPLASMON RESONANCESPHASE-TRANSITIONCOPPERPERFORMANCEFILMSSOLIDSCHALLENGESMONOLAYERS

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