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We thank Herbert Over from the Institute of Physical Chemistry at the JLU Giessen for sharing his knowledge and experience and helping improve the manuscript. Financial support was provided by the DFG via the GrK (Research training group) 2204 “Substitute Materials for sustainable Energy Technologies.” M.C. thanks Ramon y Cajal program RYC‐2013‐12448. The authors also acknowledge financial support from the Spanish Ministry of Economy and Competitiveness, through the “Severo Ochoa” Programme for Centres of Excellence in R&D (SEV‐ 2015‐0496) and MAT2017‐83169‐R AEI/FEDER,UE. This article is based upon work from COST Action MP1402 “Hooking together European research in atomic layer deposition (HERALD),” supported by COST (European Cooperation in Science and Technology). S.M.S. acknowledges funding from “Programa Internacional de Becas ‘la Caixa”’‐Severo Ochoa.” ICN2 members acknowledge funding from Generalitat de Catalunya 2017 SGR 327 and the Spanish MINECO project ENE2017‐85087‐C3. ICN2 acknowledges support from the Severo Ochoa Programme (MINECO, grant no. SEV‐2013‐0295) and is funded by the CERCA Programme /Generalitat de Catalunya. Part of this work was performed in the framework of Universitat Autonoma de Barcelona Materials Science PhD program. This received funding from the European Union's Horizon 2020 Research and Innovation Programme under grant agreement no. 654360 NFFA‐Europe.