4.7 Article

Highly sensitive and fast perovskite photodetector functionalized by plasmonic Au nanoparticles-alkanethiol assembly

Journal

APPLIED SURFACE SCIENCE
Volume 538, Issue -, Pages -

Publisher

ELSEVIER
DOI: 10.1016/j.apsusc.2020.148007

Keywords

Au NPs-MPA assembly; Plasmon; Perovskite photodetector; Fast response

Funding

  1. National Research Foundation of Korea (NRF) - Korea government [NRF-2019RIA2C2088940]
  2. Korea Institute of Energy Technology Evaluation and Planning (KETEP)
  3. Ministry of Trade, Industry Energy (MOTIE) [20193091010240]
  4. KIST institutional research program [2E30120]

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In this study, a perovskite photodetector functionalized with Au NPs assembled with MPA was developed to enhance responsivity, detectivity, and response speed. The introduction of the Au NPs-MPA assembly significantly improved the overall device performance, demonstrating enhanced charge extraction/transport and optical absorption.
We present a perovskite photodetector functionalized with Au NPs assembled with 3-mercaptopropionic acid (MPA), a short-chain alkanethiol (HS(CH2)(n)COOH, n = 2), where the assembled Au NPs are embedded in the PEDOT:PSS layer of the hole transport layer. The incorporation of the Au NPs-MPA assembly not only enhances the responsivity strongly, but also improves the detectivity due to a reduction in dark current and enhances the response speed of the device. In particular, the responsivity, noise equivalent power (NEP), and response speed of the Au NPs-MPA assembly device significantly improved by approximately 4.1, 15.6, and 2.8 folds, respectively, as compared with those of the pristine device under visible light illumination. Our device exhibits a responsivity of similar to 2063 A W-1 and a NEP of similar to 1.93 x 10(-14) W Hz(-1/2) due to the incorporation of the Au NPsMPA assembly, and a response time of similar to 300 ns is achieved by the fabrication of a short channel in the device. The improved charge extraction/transport and optical absorption by the introduction of Au NPs-MPA assembly lead to the overall improved device performance.

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