Working Paper Article Version 3 This version is not peer-reviewed

Influence of Substrate, Process Conditions, and Post-Annealing Temperature on the Properties of ZnO Thin Films Grown by SILAR Method

Version 1 : Received: 24 July 2020 / Approved: 26 July 2020 / Online: 26 July 2020 (02:19:43 CEST)
Version 2 : Received: 24 September 2020 / Approved: 25 September 2020 / Online: 25 September 2020 (05:38:16 CEST)
Version 3 : Received: 11 December 2020 / Approved: 15 December 2020 / Online: 15 December 2020 (10:25:15 CET)

A peer-reviewed article of this Preprint also exists.

Ghos, B.C.; Farhad, S.F.U.; Patwary, M.A.M.; Majumder, S.; Hossain, Md.A.; Tanvir, N.I.; Rahman, M.A.; Tanaka, T.; Guo, Q. Influence of the Substrate, Process Conditions, and Postannealing Temperature on the Properties of ZnO Thin Films Grown by the Successive Ionic Layer Adsorption and Reaction Method. ACS Omega 2021, 6, 2665–2674, doi:10.1021/acsomega.0c04837. Ghos, B.C.; Farhad, S.F.U.; Patwary, M.A.M.; Majumder, S.; Hossain, Md.A.; Tanvir, N.I.; Rahman, M.A.; Tanaka, T.; Guo, Q. Influence of the Substrate, Process Conditions, and Postannealing Temperature on the Properties of ZnO Thin Films Grown by the Successive Ionic Layer Adsorption and Reaction Method. ACS Omega 2021, 6, 2665–2674, doi:10.1021/acsomega.0c04837.

Abstract

Here we report the effect of substrate, sonication process, and post-annealing on the structural, morphological, and optical properties of ZnO thin films grown in the presence of isopropyl alcohol (IPA) at temperature 30 – 65 ℃ by successive ionic layer adsorption and reaction (SILAR) method on both soda lime glass (SLG) and Cu foil. The X-ray diffraction (XRD) patterns confirmed the preferential growth thin films along (002) and (101) plane of wurtzite ZnO structure while grown on SLG and Cu foil substrate respectively. Both XRD and Raman spectra confirmed the ZnO and Cu-oxide phases of the deposited films. Scanning electron microscope (SEM) image of the deposited films shows compact and uniformly distributed grains for samples grown without sonication while using IPA at temperature 50 and 65 ℃. The post-annealing treatment improves the crystallinity of the films, further evident by XRD and transmission and reflection results. The estimated optical bandgaps are in the range of 3.37-3.48 eV for as-grown samples. Results revealed that high-quality ZnO thin films could be grown without sonication using IPA dispersant at 50 ℃, which is much lower than the reported results using the SILAR method. This study suggests that in the presence of IPA, the SLG substrate results in better c-axis oriented ZnO thin films than that of DI water, ethylene glycol, propylene glycol at the optimum temperature of 50 ℃. Air-annealing of the samples grown on Cu foils induced the formation of CuxO/ZnO junctions which is evident from the characteristic I-V curve including the structural and optical data.

Keywords

ZnO thin films; SILAR; IPA dispersant; copper oxide; post-annealing; CuxO/ZnO

Subject

Chemistry and Materials Science, Biomaterials

Comments (1)

Comment 1
Received: 15 December 2020
Commenter: Syed Farid Uddin Farhad
Commenter's Conflict of Interests: Author
Comment: Materials and Methods sections are updated. Mechanism of the improvement of SILAR grown thin films crystallinity are discussed 

XRD patterns of pristine and annealed Cu-foil are included and discussed accordingly
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