Wavenumber ( cmdried at 80oCand annealed at 5 different temperatures : 250 to 650oC Synthesised AZO...
Transcript of Wavenumber ( cmdried at 80oCand annealed at 5 different temperatures : 250 to 650oC Synthesised AZO...
Conclusions
Synthesis of aluminium doped zinc oxide inks for printed transparent electrode applications
Harish K* and P. Swaminathan
Department of Metallurgical and Materials Engineering, Indian Institute of Technology Madras,Chennai 600036, INDIA
*[email protected], [email protected] ID:712
• Aluminium doped zinc oxide (AZO) is a low cost replacement toIndium tin oxide in transparent conducting applications.
• Inkjet printing is a cheap, fast route to fabricate functionalmaterials.
• Wet chemical synthesis can be employed to have a greatercontrol over sizes, shapes and composition of particles.
Experimental Procedure
Effect of conc. variation at 250 °C
XRD
5 mol % Al at 250 °C
Mixture of Zn(OH)2 and Al(OH)3 dried at 80 oC and annealed at 5 different temperatures : 250 to 650 oC
Synthesised AZO characterized using X – Ray Diffractometry(XRD), Raman, and Diffuse Reflectance Spectroscopy (DRS)
Formulation of an ethylene glycol based ink Morphological characterization – optical microscopy and SEM
Printing conducting patterns using inkjet printing and testing as transparent electrodes
• AZO nanoparticles synthesized using a wet chemical route for different concentrations of aluminium and annealing temperatures.
• XRD shows a higher angle shift with increase in aluminium concentration, confirming incorporation into lattice.
• A sample with 15 mol % Al was selected and its structural and electronic properties were examined via DRS and Raman spectroscopy.
• An Ethylene Glycol based ink was formulated and the printed patterns were continuous under optical microscopy and SEM.
• Electrical conductivity of the printed patterns will be investigated as a part of future work.
Research supported by Faculty Seed Grant, IITM. Raman and DRS wereperformed at the Dept. of Physics, IITM. SEM was carried out at Dept. ofElectrical Engg., IITM. XRD and Optical Microscopy were performed at theDept. of MME, IITM.
Effect of annealing temperature on 15 mol % Al
Morphology of printed patterns
Motivation
Reactions : Drop wise, room temperature addition ; 0 ≤ 𝑥 ≤ 0.03
Zn(NO3)2 (0.1 – x) M + NaOH (0.1M) Zn(OH)2 + 2NaNO3
Al(NO3)3 x M + NaOH (0.1M) Al(OH)3 + 3NaNO3
Results
Raman SpectraDRS
SEM images of drop cast ink on glass substrate
Optical microscopy of drop cast ink on glass substrate
Acknowledgement
1. Elvira Fortunato et al., Transparent Conducting Oxides for Photovoltaics, MRS Bulletin, 32, 242 (2007)
2. Alexander Kamyshny et al., Metal-based inkjet inks for printed electronics, The Open Applied Physics Journal, 4, 19 (2011)
3. A. V. Nikam et al., Wet chemical synthesis of metal oxide nanoparticles: a review, Cryst. Eng. Comm., 20, 5091 (2018)
4. Taziwa R et al., Structural, Morphological and Raman Scattering Studies of Carbon Doped ZnO Nanoparticles Fabricated by PSP Technique, J Nanosci. Nanotechnol. Res., 1, 3 (2017)
References
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5 mol % Al
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ICSD #29272 : ZnO
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Energy(eV)
(F(R
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Temperature(𝐢𝐧 oC) Bandgap (in eV)
250oC 3.89
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550oC 3.56
650oC 3.39
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