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@article{1378718,
author = {Kotilainen, Minna Paula Katriina and Krumpolec, Richard and Franta, Daniel and Souček, Pavel and Homola, Tomáš and Cameron, David Campbell and Vuoristo, Petri},
article_location = {AMSTERDAM, NETHERLANDS},
article_number = {July},
doi = {http://dx.doi.org/10.1016/j.solmat.2017.02.033},
keywords = {Solar absorber;Diffusion barrier;Thermal ageing;Copper diffusion;HfO2 thin film},
language = {eng},
issn = {0927-0248},
journal = {Solar Energy Materials and Solar Cells},
title = {Hafnium oxide thin films as a barrier against copper diffusion in solar absorbers},
url = {http://www.sciencedirect.com/science/article/pii/S0927024817300958},
volume = {166},
year = {2017}
}
TY - JOUR
ID - 1378718
AU - Kotilainen, Minna Paula Katriina - Krumpolec, Richard - Franta, Daniel - Souček, Pavel - Homola, Tomáš - Cameron, David Campbell - Vuoristo, Petri
PY - 2017
TI - Hafnium oxide thin films as a barrier against copper diffusion in solar absorbers
JF - Solar Energy Materials and Solar Cells
VL - 166
IS - July
SP - 140-146
EP - 140-146
PB - ELSEVIER SCIENCE BV
SN - 09270248
KW - Solar absorber;Diffusion barrier;Thermal ageing;Copper diffusion;HfO2 thin film
UR - http://www.sciencedirect.com/science/article/pii/S0927024817300958
L2 - http://www.sciencedirect.com/science/article/pii/S0927024817300958
N2 - The thermal stability of copper substrate material used in solar thermal collectors was investigated with and without atomic layer deposited (ALD) hafnium oxide barrier films at temperatures of 200–400 °C. HfO2 films were studied as barriers against thermal diffusion of copper substrate atoms. The ALD HfO2 thin films were deposited in a thermal process at 200 °C using Tetrakis(Dimethylamido)Hafnium(Hf(NMe2)4) and H2O precursors, with 200, 400, and 600 cycles. The Cu substrates with and without HfO2 thin films were aged by means of heat treatment in air. The influence of the HfO2 barriers was determined by optical, microstructural, and morphological analyses before and after the ageing procedures. The optical performance of the HfO2 barriers as a part of solar absorber stack was modelled with CODE Coating Designer. The copper surface without a HfO2 barrier thin film oxidized significantly, which increased thermal emittance and surface roughness. 200 cycles of HfO2 deposition did not result in a completely continuous coating and only provided a little protection against oxidation. Films of 200 and 400 cycles gave continuous coverage and the thickest HfO2 thin film studied, which was deposited from 600 ALD cycles and had a thickness ~50 nm, prevented Cu oxidation and diffusion processes after 2 h heat treatment in air at 300 °C, and retained low thermal emissivity. At 400 °C, diffusion and formation of copper oxide hillocks were observed but the HfO2 thin film significantly retarded the degradation when compared to a Cu substrate without and with thinner barrier layers.
ER -
KOTILAINEN, Minna Paula Katriina, Richard KRUMPOLEC, Daniel FRANTA, Pavel SOUČEK, Tomáš HOMOLA, David Campbell CAMERON and Petri VUORISTO. Hafnium oxide thin films as a barrier against copper diffusion in solar absorbers. \textit{Solar Energy Materials and Solar Cells}. AMSTERDAM, NETHERLANDS: ELSEVIER SCIENCE BV, 2017, vol.~166, July, p.~140-146. ISSN~0927-0248. Available from: https://dx.doi.org/10.1016/j.solmat.2017.02.033.
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