On-chip Single-crystal Plasmonic Optoelectronics for Efficient Hot Carrier Collection and Photovoltage Detection

TL;DR

This paper demonstrates a single-crystal plasmonic platform using gold nanowires that significantly improves hot carrier collection and photovoltage detection, advancing on-chip nanophotonic device performance.

Contribution

It introduces a scalable single-crystal gold nanowire platform with enhanced optoelectronic properties for hot carrier and photovoltage applications, surpassing polycrystalline devices.

Findings

Single-crystal gold nanogap devices show an order of magnitude higher photovoltage.

Enhanced hot carrier collection due to suppressed electron-phonon scattering.

Potential for high-performance, scalable on-chip nanophotonic devices.

Abstract

Large-area chemically synthesized single-crystal metals with nanometer-scale thickness have emerged as promising materials for on-chip nanophotonic applications, owing to their superior plasmonic properties compared to nanofabricated polycrystalline counterparts. While much recent attention has focused on their optical properties, the combined optimal electrical and optical characteristics, which hold great potential for high-performance optoelectronic functionalities, remain largely unexplored. Here, we present a single-crystal plasmonic optoelectronic platform based on nanowires fabricated from synthesized gold flakes and demonstrate its capabilities for highly enhanced hot carrier collection, electroluminescence, and photovoltage detection. Notably, single-crystal gold nanogap devices exhibit an order of magnitude higher open-circuit photovoltage compared to polycrystalline devices, representing one of the highest reported photovoltage sensing performances in terms of on-chip device density and responsivity per area. Our analysis revealed that this enhancement is attributed mostly to the suppression of electron-phonon scattering and improved hot carrier tunneling efficiency in single-crystal devices. These results highlight the potential of large-scale single-crystal nanostructures for both fundamental studies of nanoscale hot carrier transport and scalable electrically driven nanophotonic applications.