Upconverter silicon solar cell devices for efficient utilization of sub-band-gap photons under concentrated solar radiation

Stefan Fischer, Aruna Ivaturi, Benjamin Frohlich, Marc Rudiger, Armin Richter, Karl W Kramer, Bryce S Richards, Jan Christoph Goldschmidt

Research output: Contribution to journalArticle

Abstract

Upconversion (UC) of sub-band-gap photons has the potential to increase the efficiency of solar cells significantly. We realized an upconverter solar cell device, by attaching an upconverter layer of beta-NaYF4 doped with 25% Er3+ embedded in the polymer perfluorocyclobutyl to the rear side of a bifacial silicon solar cell. We determined the external quantum efficiency of such upconverter solar cell devices under broad-band sub-band-gap excitation. Under consideration of spectral mismatch, we calculated the expected increase of the short-circuit current density due to UC under the air mass 1.5 global illumination. We determined an enhancement of 2.2 mA/cm(2) for a spectral excitation band ranging from 1450 to 1600 nm and a comparatively low solar concentration of 78 suns. Subsequently, a system of concentrator lens and upconverter solar cell device was characterized with a solar simulator. We determined an increase of the short-circuit current density due to UC of sub-band-gap photons of 13.1 mA/cm(2) under a concentration of 210 suns. This corresponds to a potential relative increase of the solar cell efficiency of 0.19%.

Original languageEnglish
Pages (from-to)183-189
Number of pages7
JournalIEEE Journal of Photovoltaics
Volume4
Issue number1
DOIs
Publication statusPublished - Jan 2014

Keywords

  • Optical frequency conversion
  • photovoltaic cells
  • silicon
  • spectral conversion
  • upconversion (UC)
  • CONVERSION

Cite this

Fischer, S., Ivaturi, A., Frohlich, B., Rudiger, M., Richter, A., Kramer, K. W., Richards, B. S., & Goldschmidt, J. C. (2014). Upconverter silicon solar cell devices for efficient utilization of sub-band-gap photons under concentrated solar radiation. IEEE Journal of Photovoltaics, 4(1), 183-189. https://doi.org/10.1109/JPHOTOV.2013.2282744