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Parametric study of seed‐layer formation for low‐temperature hydrothermal growth of highly oriented Zn O films on glass substrates
Author(s) -
Podlogar Matejka,
Vengust Damjan,
Richardson Jacob J.,
Strojnik Martin,
Mazaj Matjaž,
Trefalt Gregor,
Daneu Nina,
Rečnik Aleksander,
Bernik Slavko
Publication year - 2013
Publication title -
physica status solidi (a)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.532
H-Index - 104
eISSN - 1862-6319
pISSN - 1862-6300
DOI - 10.1002/pssa.201228757
Subject(s) - materials science , indium tin oxide , zinc nitrate , hydrothermal circulation , grain size , chemical engineering , coalescence (physics) , transmittance , nucleation , zinc , layer (electronics) , nanotechnology , mineralogy , composite material , optoelectronics , metallurgy , chemistry , physics , organic chemistry , astrobiology , engineering
Applications involving transparent conducting films (TCFs), such as flat‐panel displays and touch screens technologies, are dominated by indium‐tin‐oxide (ITO). Increasing prices of indium in hand with weaknesses of ITO films make a strong argument for alternative TCFs with competitive characteristics and lower price. Here we demonstrate the potential of highly oriented zinc oxide (ZnO) films grown on glass substrates under low‐temperature hydrothermal (HT) conditions at 90 °C from aqueous solutions of Zn‐nitrate and Na‐citrate. Formation of a continuous ZnO seed‐layer with proper thickness, grain size, connectivity, and orientation of seed‐grains on glass is shown to be essential to achieve conditions for the growth of highly oriented (0001), smooth, transparent, and conductive ZnO films according to the spatially confined oriented growth (SCOG) mechanism. The film grown on homogeneous seed‐layer with grain size of about 20 nm showed optical transmittance of up to 82% and relatively low resistivity for undoped ZnO ceramic in order of few 100 Ω sq −1 . Such characteristics are explained by highly oriented crystalline texture and high coalescence of ZnO crystals in these films.