• Ahiboz, D.; Andresen, E.; Manley, P.; Resch Genger, U.; Wurth, C.; Becker, C.: Enhanced Photon Upconversion Using Erbium-Doped Nanoparticles Interacting with Silicon Metasurfaces. In: 48th IEEE Photovoltaic Specialists Conference, PVSC 2021 : Fort Lauderdale, Florida, USA, 20 – 25 June 2021, online. Piscataway, NJ: IEEE, 2021. - ISBN 978-1-6654-3018-0, p. 2008-2010

10.1109/pvsc43889.2021.9518495

Abstract:
Photon upconversion (UC) using trivalent erbium (Er+3) doped crystals is a promising concept to harness near-infrared photons of the solar spectrum which cannot be directly absorbed by silicon solar cells. However, their UC efficiency at low-intensity 1 sun illumination is not relevant on device level so far. Exploiting giant near-field enhancement effects on metasurfaces is an appealing approach to enable efficient UC at low irradiance conditions. Here, we report on more than 1000-fold enhanced photon UC of NaYF4:Er+3 nanoparticles interacting with the near-fields supported by a silicon metasurface under 1550 nm excitation.