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Electrochemical Characterization of CuSCN Hole-Extracting Thin Films for Perovskite Photovoltaics
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SYSNO ASEP 0506463 Druh ASEP J - Článek v odborném periodiku Zařazení RIV J - Článek v odborném periodiku Poddruh J Článek ve WOS Název Electrochemical Characterization of CuSCN Hole-Extracting Thin Films for Perovskite Photovoltaics Tvůrce(i) 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)Zdroj.dok. ACS Applied Energy Materials. - : American Chemical Society - ISSN 2574-0962
Roč. 2, č. 6 (2019), s. 4264-4273Poč.str. 10 s. Jazyk dok. eng - angličtina Země vyd. US - Spojené státy americké Klíč. slova nanorod arrays ; solar ; deposition ; layers ; tio2 ; tin ; conductivity ; fabrication ; sno2 ; perovskite solar cell Vědní obor RIV CG - Elektrochemie Obor OECD Electrochemistry (dry cells, batteries, fuel cells, corrosion metals, electrolysis) Vědní obor RIV – spolupráce Fyzikální ústav - Fyzika pevných látek a magnetismus CEP GA18-08959S GA ČR - Grantová agentura ČR 8F17001 GA MŠMT - Ministerstvo školství, mládeže a tělovýchovy Způsob publikování Omezený přístup Institucionální podpora UFCH-W - RVO:61388955 ; FZU-D - RVO:68378271 UT WOS 000473116600038 EID SCOPUS 85068088848 DOI 10.1021/acsaem.9b00496 Anotace 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. Pracoviště Ústav fyzikální chemie J.Heyrovského Kontakt Michaela Knapová, michaela.knapova@jh-inst.cas.cz, Tel.: 266 053 196 Rok sběru 2020 Elektronická adresa http://hdl.handle.net/11104/0297696
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