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Electrochemical Characterization of CuSCN Hole-Extracting Thin Films for Perovskite Photovoltaics
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SYSNO ASEP 0506463 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Electrochemical Characterization of CuSCN Hole-Extracting Thin Films for Perovskite Photovoltaics Author(s) Kavan, Ladislav (UFCH-W) RID, ORCID
Vlčková Živcová, Zuzana (UFCH-W) RID, ORCID
Hubík, Pavel (FZU-D) RID, ORCID
Arora, N. (CH)
Dar, M.I. (CH)
Zakeeruddin, S. M. (CH)
Grätzel, M. (CH)Source Title ACS Applied Energy Materials. - : American Chemical Society - ISSN 2574-0962
Roč. 2, č. 6 (2019), s. 4264-4273Number of pages 10 s. Language eng - English Country US - United States Keywords nanorod arrays ; solar ; deposition ; layers ; tio2 ; tin ; conductivity ; fabrication ; sno2 ; perovskite solar cell Subject RIV CG - Electrochemistry OECD category Electrochemistry (dry cells, batteries, fuel cells, corrosion metals, electrolysis) Subject RIV - cooperation Institute of Physics - Solid Matter Physics ; Magnetism R&D Projects GA18-08959S GA ČR - Czech Science Foundation (CSF) 8F17001 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) Method of publishing Limited access Institutional support UFCH-W - RVO:61388955 ; FZU-D - RVO:68378271 UT WOS 000473116600038 EID SCOPUS 85068088848 DOI 10.1021/acsaem.9b00496 Annotation CuSCN thin films (optimized previously for perovskite photovoltaics) are deposited on glass, F:SnO2 (FTO), Au, glass-like carbon (GC), and reduced graphene oxide (rGO). They exhibit capacitive charging in an electrochemical window from ca.0.3 to 0.2 V vs Ag/AgCl. Outside this window, CuSCN film is prone to chemical and structural changes. Anodic breakdown (at ca. 0.5 V) causes restructuring into submicrometer particles and denuding of the substrate. The natural p-doping is demonstrated by both the Hall effect and Mott-Schottky plots from electrochemical impedance. The corresponding flatband potentials (in V vs Ag/AgCl) varied with the substrate type as follows: 0.12 V (CuSCN@FTO), 0.08 V (CuSCN@Au),0.02 V (CuSCN@GC), and 0.00 V (CuSCN@rGO). The acceptor concentrations determined from electrochemical impedance spectroscopy are by orders of magnitude larger than those from electrical conductivity and the Hall effect, the latter being regarded correct. Raman spectra confirm that thiocyanate is the dominating structural motif over the isomeric isothiocyanate. In situ Raman spectroelectrochemistry discloses substrate-specific intensity changes upon electrochemical charging. The blocking function is tested by a newly designed redox probe, Ru(NH3)(6)(3+/2+). It not only has the appropriate redox potential for testing of the CuSCN films but also avoids complications of the standard ´´ferrocyanide test´´ which is normally used for this purpose. The perovskite solar cells exhibit better solar conversion efficiency, fill factor, and open-circuit voltage for the rGO-containing devices, which is ascribed to a larger driving force for the hole injection from CuSCN into rGO. Workplace J. Heyrovsky Institute of Physical Chemistry Contact Michaela Knapová, michaela.knapova@jh-inst.cas.cz, Tel.: 266 053 196 Year of Publishing 2020 Electronic address http://hdl.handle.net/11104/0297696
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