Radiative recombination is the recombination mechanism that dominates in direct bandgap semiconductors. The light produced from a light emitting diode (LED) is the most obvious example of radiative recombination in a semiconductor device. Concentrator and space solar cells cells are typically made from direct bandgap materials (GaAs etc) and radiative recombination dominates. However, most terrestrial solar cells are made from silicon, which is an indirect bandgap semiconductor and radiative recombination is extremely low and usually neglected.