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Mimicry of Sputtered i-ZnO Thin Films Using Chemical Bath Deposition for Solution-Processed Solar Cells
journal contribution
posted on 2014-12-24, 00:00 authored by Enrico Della Gaspera, Joel van Embden, Anthony S. R. Chesman, Noel W. Duffy, Jacek J. JasieniakSolution processing provides a versatile
and inexpensive means to prepare functional materials with specifically
designed properties. The current challenge is to mimic the structural,
optical, and/or chemical properties of thin films fabricated by vacuum-based
techniques using solution-based approaches. In this work we focus
on ZnO to show that thin films grown using a simple, aqueous-based,
chemical bath deposition (CBD) method can mimic the properties of
sputtered coatings, provided that the kinetic and thermodynamic reaction
parameters are carefully tuned. The role of these parameters toward
growing highly oriented and dense ZnO thin films is fully elucidated
through detailed microscopic and spectroscopic investigations. The
prepared samples exhibit bulk-like optical properties, are intrinsic
in their electronic characteristics, and possess negligible organic
contaminants, especially when compared to ZnO layers deposited by
sol–gel or from nanocrystal inks. The efficacy of our CBD-grown
ZnO thin films is demonstrated through the effective replacement of
sputtered ZnO buffer layers within high efficiency solution processed
Cu2ZnSnS4xSe4(1–x) solar cells.