J. Mater. Sci. Technol. ›› 2025, Vol. 218: 45-53.DOI: 10.1016/j.jmst.2024.08.033

• Research Article • Previous Articles     Next Articles

Plasmonic perovskite photodetector with high photocurrent and low dark current mediated by Au NR/PEIE hybrid layer

Hannah Kwona,b, Ju Won Lima,c,*, Dong Ha Kima,d,e,*   

  1. aDepartment of Chemistry and Nanoscience, Ewha Womans University, Seoul 03760, South Korea;
    bNanophotonics Research Center, Korea Institute of Science and Technology (KIST), Seoul 02792, South Korea;
    cGeorge W. Woodruff School of Mechanical Engineering, Georgia Institute of Technology, Carbon-Neutral Energy Solutions Laboratory, 495 Tech Way, NW, Atlanta, GA 30332, USA;
    dBasic Sciences Research Institute (Priority Research Institute), Ewha Womans University, Seoul 03760, South Korea;
    eNanobio·Energy Materials Center (National Research Facilities and Equipment Center), Ewha Womans University, Seoul 03760, South Korea
  • Received:2024-05-10 Revised:2024-08-13 Accepted:2024-08-18 Published:2025-05-20 Online:2024-09-07
  • Contact: *E-mail addresses: jlim339@gatech.edu (J.W. Lim), dhkim@ewha.ac.kr (D.H. Kim)

Abstract: Hybrid organic-inorganic perovskite photodetectors have gained significant attention due to their superior potential for optoelectronic applications, offering various advantages such as low-cost processing, high charge carrier mobility, and lightweight properties. However, these perovskite photodetectors exhibit relatively low absorption in the near-infrared (NIR) range, which limits their potential applications. Here, to address this challenge, the integration of gold nanorods (Au NRs) utilizing localized surface plasmon resonance (LSPR) effects in the NIR range has been developed, leading to enhanced light absorption in the active region and higher photocurrent generation. Additionally, ∼7.9 nm of thin polyethyleneimine ethoxylated (PEIE) interlayers were incorporated into the Au NR photodetectors, suppressing dark current by blocking charge injection. As a result, the synergistic effect of the Au NR/PEIE hybrid layer has led to a high-performance photodetector with a responsivity of 0.360 A/W and a detectivity of 1.81 × 1010 Jones, demonstrating a noticeable enhancement compared to the control device. Finite-difference time-domain (FDTD) simulations, morphological characterizations, and photoluminescence studies further support the mechanism for enhancing the performance of the device. We believe that our plasmon-enhanced protocol holds strong potential as a promising platform for perovskite optoelectronic devices.

Key words: Perovskite-gold nanorod hybrid, PEIE interlayer, Low dark current, Perovskite photodetector, Plasmonics