POS4-0333
Solution-Processed PMMA Mold Patterned Au Nanoparticles Enabling Localized Surface Plasmon Resonance in Inverted CQD Infrared Photodetectors
Topic
S4. Colloids, Interfaces, and Molecular Assemblies for Functional Soft Materials
When and Where
Sep 29, 2026
08:30 - 09:30
Room 301 (Grand Ballroom)
Session Chairs
Hae Jung SON
Boseok KANG
Presenter(s)
Minjeong Kim (Pusan National University)
Co-Author(s)
Abstract
In this study, we propose a device architecture that exploits localized surface plasmon resonance (LSPR) induced by Au nanoparticles to address the issues of high dark current, trap-induced noise, and limited optical absorption arising from the thin absorbing layer in colloidal quantum dot (CQD)-based infrared photodetectors. Conventional approaches for enhancing light absorption often rely on high-energy processes such as lithography and etching directly performed on the CQD layer, which can cause severe damage to the active layer and consequently force the optical structures to be placed beneath the CQD layer, leading to an inefficient optical pathway. Here, we combine patterning using a poly(methyl methacrylate) (PMMA) polymer mold with solution-based processing to form ordered arrays of Au nanoparticles on a separate substrate, followed by immersion transfer printing of these arrays onto the top of the CQD layer in an inverted device configuration. The PMMA mold enables precise replication of microscale and nanoscale patterns, allowing control over the periodicity and density of the Au nanoparticle arrays to induce strong LSPR within the CQD absorption band, while remaining compatible with low-cost, large-area fabrication. By positioning the LSPR-active Au nanoparticle layer at the top of the device along the light incidence direction, we optimize the optical path within the CQD layer and simultaneously mitigate damage from high-energy patterning processes. These results demonstrate that Au nanoparticle LSPR structures formed via polymer mold processing provide an effective design strategy for next-generation CQD infrared photodetectors.
