In Situ Visualization of Localized Surface Plasmon Resonance‐Driven Hot Hole Flux

Advanced Science

Hyunhwa Lee¹  Kyoungjae Song¹  Jeong Young Park¹  Moonsang Lee² 

[1] Department of Chemistry Korea Advanced Institute of Science and Technology (KAIST) Daejeon 34133 Republic of Korea;Research Center for Materials Analysis Korea Basic Science Institute (KBSI) Daejeon 34133 Republic of Korea;

关键词: finite‐difference time‐domain simulations;    hot holes;    localized surface plasmon resonance;    photoconductive atomic force microscopy;    photocurrents;   

DOI  :  10.1002/advs.202001148

来源: DOAJ

【 摘 要 】

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.

【 授权许可】

Unknown