Premium
Expanding Thermal Plasma Deposition of Al‐Doped ZnO: On the Effect of the Plasma Chemistry on Film Growth Mechanisms
Author(s) -
Williams Benjamin L.,
Ponomarev Mikhail V.,
Verheijen Marcel A.,
Knoops Harm C. M.,
Chandramohan Abhinaya,
Duval Leo,
van de Sanden Mauritius C. M.,
Creatore Mariadriana
Publication year - 2016
Publication title -
plasma processes and polymers
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.644
H-Index - 74
eISSN - 1612-8869
pISSN - 1612-8850
DOI - 10.1002/ppap.201500179
Subject(s) - nucleation , microstructure , plasma , materials science , chemical vapor deposition , plasma enhanced chemical vapor deposition , thin film , grain boundary , analytical chemistry (journal) , volumetric flow rate , chemical engineering , grain growth , doping , texture (cosmology) , deposition (geology) , chemistry , nanotechnology , metallurgy , optoelectronics , environmental chemistry , thermodynamics , engineering , quantum mechanics , physics , organic chemistry , artificial intelligence , image (mathematics) , computer science , biology , paleontology , sediment
This work presents a review of expanding thermal plasma – chemical vapour deposition (ETP‐CVD) of Al‐doped ZnOtransparent conducting oxides (TCOs), alongside new results providing insights into the role of the plasma chemistry on film microstructure. Standard growth conditions generate high resistivities (>10 −3 Ω · cm) at low film thicknesses (<300 nm) as a result of a high grain boundary and void density. Microscopy studies of the early growth stage reveal that a high nucleation probability and strong <0002>‐texture are the causes of this microstructure. We investigate how the precursor feed composition (diethylzinc‐to‐O 2 flow rate ratio) can be utilised to modify the growth mechanism and consequently reduce film resistivity (∼10 −4 Ω · cm), focussing on the role that this flow rate ratio has on the plasma chemistry developing in the downstream region of the expanding plasma (as supported by Langmuir probe and mass spectrometry measurements).