Decoding the Self-Assembly Plasmonic Interface Structure in a PbS Colloidal Quantum Dot Solid for a Photodetector

Tianfu Guan, Wei Chen, Haodong Tang, Dong Li, Xiao Wang, Christian L. Weindl, Yawen Wang, Zhiqiang Liang, Suzhe Liang, Tianxiao Xiao, Suo Tu, Stephan V. Roth, Lin Jiang, Peter Müller-Buschbaum

Research output: Contribution to journalArticlepeer-review

3 Scopus citations

Abstract

Hybrid plasmonic nanostructures have gained enormous attention in a variety of optoelectronic devices due to their surface plasmon resonance properties. Self-assembled hybrid metal/quantum dot (QD) architectures offer a means of coupling the properties of plasmonics and QDs to photodetectors, thereby modifying their functionality. The arrangement and localization of hybrid nanostructures have an impact on exciton trapping and light harvesting. Here, we present a hybrid structure consisting of self-assembled gold nanospheres (Au NSs) embedded in a solid matrix of PbS QDs for mapping the interface structures and the motion of charge carriers. Grazing-incidence small-angle X-ray scattering is utilized to analyze the localization and spacing of the Au NSs within the hybrid structure. Furthermore, by correlating the morphology of the Au NSs in the hybrid structure with the corresponding differences observed in the performance of photodetectors, we are able to determine the impact of interface charge carrier dynamics in the coupling structure. From the perspective of architecture, our study provides insights into the performance improvement of optoelectronic devices.

Original languageEnglish
Pages (from-to)23010-23019
Number of pages10
JournalACS Nano
Volume17
Issue number22
DOIs
StatePublished - 28 Nov 2023

Keywords

  • grazing-incidence small-angle X-ray scattering
  • hybrid nanostructures
  • optoelectronics
  • quantum dot
  • self-assembled monolayer

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