Intermediate band solar cells are a new generation of photovoltaics that allow for better utilization of the solar spectrum. The key and most challenging requirement for these cells is an efficient optical coupling between the intermediate band and the charge conducting bands. In this work two‐color electroluminescence associated with transitions from and to the intermediate band is observed in GaNAs based intermediate band solar cell structures. These results provide the first direct evidence for the optical coupling required for the cell operation and offer the potential of using similar structures for multicolor light emitting devices operating under forward and reverse bias conditions.
Read more at Advanced Energy Materials:
https://onlinelibrary.wiley.com/doi/full/10.1002/aenm.201501820
12 Dec 2015