Abstract:Photoluminescence (PL) and Raman scattering were used to characterize the single crystals of Cu2ZnSiQ4(Q = S, Se). Thin-blade single crystals of Cu2ZnSiQ4were grown by chemical vapor transport techniqueusing iodine as a transport agent. PL spectrum of Cu2ZnSiS4showed several near-band-edge emissionlines and two broad bands at lower energy side, while only an asymmetric broad band was detectedfor Cu2ZnSiSe4. The vibrational properties and the inﬂuence of the anion substitution on the phonon spec-tra were studied by Raman spectroscopy. The substitution of sulfur by selenium leads to a down shift ofabout 169 cm1for the most intense A1mode due to the mass effect and lower force constants for theselenium containing compound Photoluminescence and Raman scattering characterization of Cu2ZnSiQ4 (Q = S, Se) single crystals.