Systematic study and performance optimization of transparent conducting indium–zinc oxides thin films
2001
Abstract To optimize the physical properties of In 2 O 3 –ZnO pulsed laser deposited thin films, we embarked on a systematic study of their microstructural characterization and transport properties. We found that the electrical properties of the films are greatly governed by their microstructure, which evolves from granular to fiber and to columnar textures, as we go from cubic In 2 O 3 to hexagonal ZnO via Zn k In 2 O k +3 layered structure in the binary In 2 O 3 –ZnO phase diagram. Maximum conductivity is reached for a Zn/(Zn+In)=0.5 (at.) composition having a layered Zn k In 2 O k +3 -type structure with essentially k =2, which was synthesized for the first time. Electrochemical measurements show that this film can be used as a transparent electrode in electrochromic devices operating either in an aqueous or organic medium.
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