Complex sentence: When phase separation can be avoided, the IQE and fill factor of InGaAsSb are approaching theoretical limits in wavelength ranges near the bandgap energy, however, the V oc/E g ratio is far from the ideal.
Split into simpler sentences: When phase separation can be avoided, the IQE and fill factor of InGaAsSb approach theoretical limits in wavelength ranges near the bandgap energy. However, the V oc/E g ratio is far from the ideal.