Tuning the Structural and Optical Properties of SILAR-Deposited Cu2O Films Through Zn Doping

doi:10.1007/s40195-015-0292-y

Abstract

Abstract:

Undoped and Zn-doped Cu₂O films were deposited onto glass substrates using successive ionic layer adsorption and reaction (SILAR) technique with different Zn doping levels (0, 1, 2, 3, 5 and 10 wt%). The structural, optical, and surface morphological studies were carried out and reported. The structural study revealed that the crystalline quality is gradually enhanced up to 5 wt% of Zn doping level, and then quality begins to degrade for further increase in doping level. Moreover, the preferential orientation changes from (111) to (110) for the highest doping level were examined. Optical study shows that the transmittance (65%) and optical band gap values are maximum (2.41 eV) when the Zn doping level is at 5 wt%. The photoluminescence study confirms the presence of various defects in the Cu₂O matrix and also the variation obtained in the optical band gap from the transmittance data. SEM images revealed the annealing-induced changes in the surface morphology of the films.

Key words: Cu2O thin films, Structural properties, Zener pinning effect, Optical properties, SEM

A. T. Ravichandran, K. Dhanabalan, K. Ravichandran, R. Mohan, K. Karthika, A. Vasuhi, B. Muralidharan. Tuning the Structural and Optical Properties of SILAR-Deposited Cu₂O Films Through Zn Doping[J]. Acta Metallurgica Sinica (English Letters), 2015, 28(8): 1041-1046.

Figures/Tables 10

Table 1 Deposition parameters employed in this study

Cationic precursor (M)	Copper sulfate pentahydrate (0.1 M) + sodium thiosulfate (0.1 M)
Anionic precursor (M)	Sodium hydroxide (1 M)
Dopant precursor	Zinc sulfate (0, 1, 2, 3, 5 and 10 wt%)
Temperature of cationic solution	Room temperature
Temperature anionic solution	70 °C
Dipping time in cationic solution	20 s
Dipping time in anionic solution	20 s
Number of dipping cycles	50

Fig. 1 XRD patterns of undoped and Zn-doped Cu2O films

Fig. 2 Texture coefficient of undoped and Zn-doped Cu2O films

Table 2 Structural and optical parameters of Zn-doped Cu2O films

Zn doping level (wt%)	Crystallite size (D) nm	Lattice parameter (a) 10^-1 nm	Optical band gap (E _g) eV
0	18	4.3023	2.34
1	30	4.2861	2.35
2	39	4.2733	2.37
3	52	4.2829	2.38
5	69	4.2817	2.41
10	44	4.2892	2.39

Fig. 3 XRD patterns of annealed undoped and Zn-doped (5 wt%) Cu2O films

Fig. 4 Transmittance spectra of undoped and Zn-doped Cu2O films

Fig. 5 dT/dλ versus λ avg plots of undoped and Zn-doped Cu2O films

Fig. 6 Photoluminescence spectra of undoped and Zn-doped Cu2O films

Fig. 7 SEM images of as-deposited a, annealed b undoped Cu2O films

Fig. 8 SEM images of as-deposited a, annealed b Zn (5wt%)-doped Cu2O films

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Tuning the Structural and Optical Properties of SILAR-Deposited Cu₂O Films Through Zn Doping

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