Question: GaAs (E g = 1.4 eV) and ZnSe (E g = 2.6 eV) are isoelectronic with Ge. Their band structures are shown below. Are they

GaAs (E_g = 1.4 eV) and ZnSe (E_g = 2.6 eV) are isoelectronic with Ge. Their band structures are shown below. Are they direct- or indirect-gap semiconductors?

energy (ev) W L GaAs r X W energy (eV) W ZnSe T X W

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