Effects of thickness and atmospheric annealing on structural, electrical and optical properties of GZO thin films by spray pyrolysis

Autor:	N. Sooraj Hussain, T. Prasada Rao, M.C. Santhosh Kumar
Rok vydání:	2012
Předmět:	Materials science Photoluminescence Annealing (metallurgy) Band gap Mechanical Engineering Doping Metals and Alloys chemistry.chemical_element chemistry Mechanics of Materials Electrical resistivity and conductivity Materials Chemistry Crystallite Gallium Thin film Composite material
Zdroj:	Journal of Alloys and Compounds. 541:495-504
ISSN:	0925-8388
Popis:	Gallium doped zinc oxide (GZO) films have been prepared on glass substrates by the spray pyrolysis (SP) technique. The effects of thickness and annealing in air and oxygen on structural, electrical and optical properties of GZO thin films were investigated. As-deposited films were found polycrystalline with hexagonal structure that showed compressive stress along the c -axis. The compressive stress was found to decrease by thickness and by annealing in air or oxygen. The best characteristics have been obtained after heat treatment in oxygen, where the highest carrier concentrations have been achieved and with visible transmittance of 85–70% and resistivity of 4.21–2.25 × 10 −3 Ωcm with increasing thickness. The band gaps of oxygen annealed samples are found to have low values in comparison to air annealed and as deposited samples. The band gap dependence on the film thickness and annealing atmosphere is correlated to the shrinkage effect. Photoluminescence (PL) study was confirmed that broad visible emission in GZO films due to both the intrinsic traps and deep level vacancies.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::0228e3f6cff5b6c448f090ec376ccb9e https://doi.org/10.1016/j.jallcom.2012.05.128 Zobrazit plný text záznamu Full Text from ScienceDirect