In Situ Visualization of Localized Surface Plasmon Resonance‐Driven Hot Hole Flux. Issue 20 (6th August 2020)

• Record Type: Journal Article
• Authors: Lee, Hyunhwa; Song, Kyoungjae; Lee, Moonsang; Park, Jeong Young
• Is Part Of: Advanced science. Volume 7:Issue 20(2020)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2020-08-06
• Subjects: finite‐difference time‐domain simulations -- hot holes -- localized surface plasmon resonance -- photoconductive atomic force microscopy -- photocurrents; Science -- Periodicals; 505
• DOI: 10.1002/advs.202001148
• Languages: English
• ISSNs: 2198-3844

Abstract

Abstract: Nonradiative surface plasmon decay produces highly energetic electron–hole pairs with desirable characteristics, but the measurement and harvesting of nonequilibrium hot holes remain challenging due to ultrashort lifetime and diffusion length. Here, the direct observation of LSPR‐driven hot holes created in a Au nanoprism/p‐GaN platform using photoconductive atomic force microscopy (pc‐AFM) is demonstrated. Significant enhancement of photocurrent in the plasmonic platforms under light irradiation is revealed, providing direct evidence of plasmonic hot hole generation. Experimental and numerical analysis verify that a confined | E |‐field surrounding a single Au nanoprism spurs resonant coupling between localized surface plasmon resonance (LSPR) and surface charges, thus boosting hot hole generation. Furthermore, geometrical and size dependence on the extraction of LSPR‐driven hot holes suggests an optimized pathway for their efficient utilization. The direct visualization of hot hole flow at the nanoscale provides significant opportunities for harnessing the underlying nature and potential of plasmonic hot holes. Abstract : This work demonstrates that fast‐disappearing hot holes are directly visualized by utilizing a Au nanoprism/p‐GaN platform. Experimental and numerical analysis show that LSPR‐field enhancement boosts hot hole generation at the Au edge. In situ observation of hot hole flux exhibits LSPR‐hot hole interactions to serve as a starting point for the feasibility of hot hole‐based optoelectronic applications.