Ultrathin continuous lossy metal film for broadband light absorption and hot electron collection

Long Wen; Qin Chen

doi:10.1117/1.JPE.6.042503

12 July 2016 Ultrathin continuous lossy metal film for broadband light absorption and hot electron collection

Long Wen, Qin Chen

Author Affiliations +

Journal of Photonics for Energy, Vol. 6, Issue 4, 042503 (July 2016). https://doi.org/10.1117/1.JPE.6.042503

Abstract

A broadband perfect light absorption scheme relying on planar layers of lossy metallic and semiconductor films without structure pattering for hot electron photodetection is proposed and demonstrated. The nontrivial reflection phase shift occurring in the ultrathin lossy metal film is responsible for the strong resonance effects of the metal–semiconductor–metal (M-S-M) structures. Broadband and perfect light absorption is demonstrated experimentally for the platinum (Pt)—titanium dioxide (TiO₂)—aluminum (Al) absorber, in which the ultrathin (10 nm) Pt layer electrically serves as the hot electron emitter. Under the monochromatic light illumination, the proposed M-S-M diode shows a clear hot-electron-based photoresponse.

Citation Download Citation

Long Wen and Qin Chen "Ultrathin continuous lossy metal film for broadband light absorption and hot electron collection," Journal of Photonics for Energy 6(4), 042503 (12 July 2016). https://doi.org/10.1117/1.JPE.6.042503

Published: 12 July 2016

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