Fundamental absorption of AgGaS2 single crystals and thin polycrystalline films

AgGaS₂ single crystals show an absorption edge at 300 K which follows Urbach's rule for both directions of polarized light, parallel and vertical to the optical c-axis. The UV absorption curve of a polycrystalline thin film exhibited several maxima at photon energies which are in good agreement with previous results on optical reflectance and electroreflectance measurements.