Localized Surface Plasmon Resonance Enhanced Light Absorption in AuCu/CsPbCl3 Core/Shell Nanocrystals

Maogang Gong; Mohammed Alamri; Dan Ewing; Seyed M Sadeghi; Judy Z Wu

doi:10.1002/adma.202002163

Localized Surface Plasmon Resonance Enhanced Light Absorption in AuCu/CsPbCl₃ Core/Shell Nanocrystals

Adv Mater. 2020 Jul;32(26):e2002163. doi: 10.1002/adma.202002163. Epub 2020 May 25.

Authors

Maogang Gong¹, Mohammed Alamri¹, Dan Ewing², Seyed M Sadeghi³, Judy Z Wu¹

Affiliations

¹ Department of Physics and Astronomy, University of Kansas, Lawrence, KS, 66045, USA.
² Department of Energy's National Security Campus, Kansas City, MO, 64147, USA.
³ Department of Physics and Astronomy, The University of Alabama in Huntsville, Huntsville, AL, 35899, USA.

PMID: 32449564
DOI: 10.1002/adma.202002163

Abstract

Localized surface plasmon resonance (LSPR) is shown to be effective in trapping light for enhanced light absorption and hence performance in photonic and optoelectronic devices. Implementation of LSPR in all-inorganic perovskite nanocrystals (PNCs) is particularly important considering their unique advantages in optoelectronics. Motivated by this, the first success in colloidal synthesis of AuCu/CsPbCl₃ core/shell PNCs and observation of enhanced light absorption by the perovskite CsPbCl₃ shell of thickness in the range of 2-4 nm, enabled by the LSPR AuCu core of an average diameter of 7.1 nm, is reported. This enhanced light absorption leads to a remarkably enhanced photoresponse in PNCs/graphene nanohybrid photodetectors using the AuCu/CsPbCl₃ core/shell PNCs, by more than 30 times as compared to the counterparts with CsPbCl₃ PNCs only (8-12 nm in dimension). This result illustrates the feasibility in implementation of LSPR light trapping directly in core/shell PNCs for high-performance optoelectronics.

Keywords: core/shell; light absorption enhancement; localized surface plasmon resonance; metal/perovskite nanocrystals.

Abstract

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