Comparative study of photo- and non-photo-assisted chemical bath deposition of Zinc Selenide thin films using different volumes of hydrazine hydrate

Photo-assisted chemical bath deposition (PCBD) and non-photo-assisted chemical bath deposition (NPCBD) methods were used to deposit ZnSe thin films on non-conducting glass substrates in an alkaline medium. Zinc acetate and sodium selenosulfatewere the starting precursors. Hydrazine hydrate (HH) was used as ligand for the deposition. Different HH volumes between 5 and 35 mL were used. The films were annealed at 300 °C for 2 h. The Glancing incidence X-ray diffraction results revealed hexagonal wurtzite structure. The estimated crystallites sizes were in the range of 4–14 nm and 6–19 nm for the NPCBD and PCBD, respectively. Changes in the films morphology were observed in both of the deposition methods. Energy dispersive X-ray analysis confirmed the presence of the Zn and Se. Raman spectroscopy also confirmed peaks of ZnSe.The bandgaps of the films were ranged from 1.5 - 2.8 eV in NPCBD and 2.3–2.6 eV in PCBD. Photoluminescence spectroscopy measurements revealed green-red emission which did not show significant changes with deposition method.