Because of this , a major area in solar energy research is developing multi-junction solar cells that collect separate parts of the spectrum with more efficiency .
Wide bandgap photovoltaics are a key component for collecting the part of the spectrum beyond the infrared .
Because of this , a major area in solar energy research is developing multi-junction solar cells that collect separate parts of the spectrum with more efficiency , and wide bandgap photovoltaics are a key component for collecting the part of the spectrum beyond the infrared .