title: Photoelectric energy conversion of plasmon-generated hot carriers in metal-insulator-semiconductor structures.
abstract: Plasmonic excitation in metals has received great attention for light localization and control of light-matter interactions at the nanoscale with a plethora of applications in absorption enhancement, surface-enhanced Raman scattering, or biosensing. Electrically active plasmonic devices, which had remained underexplored, have recently become a growing field of interest. In this report we introduce a metal-insulator-semiconductor heterostructure for plasmo-electric energy conversion, a novel architecture to harvest hot-electrons derived from plasmonic excitations. We demonstrate external quantum efficiency (EQE) of 4% at 460 nm using a Ag nanostructured electrode and EQE of 1.3% at 550 nm employing a Au nanostructured electrode. The insulator interfacial layer has been found to play a crucial role in interface passivation, a requisite in photovoltaic applications to achieving both high open-circuit voltages (0.5 V) and fill-factors (0.5), but its introduction simultaneously modifies hot-electron injection and transport. We investigate the influence passivation has on these processes for different material configurations, and characterize different types of transport depending on the initial plasmon energy band, reporting power conversion efficiencies of 0.03% for nanopatterned silver electrodes.
authors.affiliation: ICFO-Institut de Ciències Fotòniques, Mediterranean Technology Park, 08860 Castelldefels, Barcelona, Spain.
authors.forename: F Pelayo
authors.initials: FP
authors.lastname: García de Arquer
authors.forename: Agustín
authors.initials: A
authors.lastname: Mihi
authors.forename: Dominik
authors.initials: D
authors.lastname: Kufer
authors.forename: Gerasimos
authors.initials: G
authors.lastname: Konstantatos
mesh_terms: D004553:Electric Conductivity; D011211:Electric Power Supplies; D004566:Electrodes; D004574:Electromagnetic Fields; D004579:Electron Transport; D004867:Equipment Design; D019544:Equipment Failure Analysis; D008027:Light; D053768:Metal Nanoparticles / Q000737:chemistry*; D012666:Semiconductors; D012834:Silver / Q000737:chemistry*; D020349:Surface Plasmon Resonance / Q000295:instrumentation*
chemical_list: D012834:Silver