Spectral absorptance of a metal-semiconductor-metal thin-multilayer structured thermophotovoltaic cell

Kazuma Isobe, Ryota Okino, Katsunori Hanamura

Research output: Contribution to journalArticlepeer-review

Abstract

Spectral absorptance of a metal-semiconductor-metal (MSM) thin-multilayer structured thermo-photovoltaic cell was experimentally investigated. A MSM consists of a thin GaSb-semiconductor sandwiched between a top fishnet-type electrode and a flat backside electrode made of gold. A thin GaSb layer was grown on a substrate made of InAs using molecular beam epitaxy, and then all of the InAs substrate was removed using wet etching. The GaSb film was bonded on a surface of gold, which was sputtered on a Si substrate, using a van der Waals bonding method. The top fishnet-type electrode was made using electron beam lithography and a lift-off process. In the case of a 115 nm thick GaSb layer and a square fishnet aperture of a 300 nm × 310 nm size, the spectral absorptance of MSM reached a local peak (95%) at a wavelength of 1.66 µm, which is similar to spectra predicted by numerical simulation. Moreover, the equivalent resonance cavity model and LC circuit model functioned well to indicate the wavelength of several distinct peaks of absorptance.

Original languageEnglish
Pages (from-to)40099-40111
Number of pages13
JournalOptics Express
Volume28
Issue number26
DOIs
Publication statusPublished - Dec 21 2020

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

Fingerprint Dive into the research topics of 'Spectral absorptance of a metal-semiconductor-metal thin-multilayer structured thermophotovoltaic cell'. Together they form a unique fingerprint.

Cite this