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Localized Surface Plasmon Resonance Enhanced Light Absorption in AuCu/CsPbCl 3 Core/Shell Nanocrystals
Author(s) -
Gong Maogang,
Alamri Mohammed,
Ewing Dan,
Sadeghi Seyed M.,
Wu Judy Z.
Publication year - 2020
Publication title -
advanced materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.707
H-Index - 527
eISSN - 1521-4095
pISSN - 0935-9648
DOI - 10.1002/adma.202002163
Subject(s) - materials science , surface plasmon resonance , nanocrystal , absorption (acoustics) , graphene , optoelectronics , plasmon , shell (structure) , photodetector , nanotechnology , photonics , core (optical fiber) , nanoparticle , composite material
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/CsPbCl 3 core/shell PNCs and observation of enhanced light absorption by the perovskite CsPbCl 3 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/CsPbCl 3 core/shell PNCs, by more than 30 times as compared to the counterparts with CsPbCl 3 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.