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Multicolor Electroluminescence from Intermediate Band Solar Cell Structure

Multicolor-Electroluminescence-from-Intermediate-Band-Solar-Cell-Structure(Top) Schematic of electron/hole transfer within intermediate band solar cell with GaNAs alloy as the light absorber.
(Bottom) Electroluminescence in intermediate band cell structure (MSC) and a reference structure (Ref). Two optical transitions coupling the intermediate band with the conduction and the valence band are observed in forward and reverse bias conditions. A single electroluminescent peak is observed in the reference structure, which does not have an isolated intermediate band.

Scientific Achievement
Observed two color electroluminescence from voltage applied across intermediate band solar cell structures in both forward and reverse bias configuration.

Significance and Impact
Demonstrated that properly modified intermediate band solar cell structures can be used as a multicolor emitter.

Research Details

  • Intermediate band solar cells are a new generation of photovoltaics that allow for better use of the solar spectrum.
  • Used previously developed GaNAs-based intermediate solar cell structure to observe two color electroluminescence under forward and reverse bias conditions.
  • Results demonstrate optical coupling between the bands critical for solar cell performance, and show that properly modified structures can be used as multicolor light emitters.

N Lopez, KM Yu, T Tanaka, & W Walukiewicz. Advanced Energy Materials 1501820 (2015)