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Analysis of the physical and photoelectrochemical properties of c-Si(p)/a-SiC:H(p) photocathodes for solar water splitting

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dc.contributor.author Mejia, Maria del Carmen es_PE
dc.contributor.author |Sanchez, Luis Francisco es_PE
dc.contributor.author |Kurniawan, Mario es_PE
dc.contributor.author |Eggert, Lara es_PE
dc.contributor.author |Tejada, Alvaro es_PE
dc.contributor.author |Camargo, Magali es_PE
dc.contributor.author |Grieseler, Rolf es_PE
dc.contributor.author |Rumiche, Francisco es_PE
dc.contributor.author |Diaz, Isabel es_PE
dc.contributor.author |Bund, Andreas es_PE
dc.contributor.author |Guerra, Jorge Andres es_PE
dc.date.accessioned 2024-05-30T23:13:38Z
dc.date.available 2024-05-30T23:13:38Z
dc.date.issued 2021
dc.description This research was funded by FONDECYT (National Fund for Scientific, Technological Development and Technological Innovation) under the agreement 147-2017. The author M Mejia has been supported by the CONCYTEC Peru (National Council for Science, Technology and Technological Innovation) doctoral scholarship under the Contract Number 236-2015-FONDECYT as well as by the PUCP vicechancellorship for research (VRI, Project No. CAP-2019-3-0041/702). The authors would like to thank the Katholischer Akademischer Auslander-Dienst institution (KAAD) for the short-term grants given to conduct research internships in the Technische Universitat Ilmenau (TU Ilmenau). Finally, the authors would like to thank the German Research Foundation (DFG) (DFG-Gz: INST 273/56-1 FUGG) and the Materials Characterization Center (CAM) at PUCP, for the financial support to conduct the characterization experiments.
dc.description.abstract The photoelectrochemical (PEC) properties of sputtered aluminum doped hydrogenated amorphous silicon carbide thin films grown on p-type crystalline silicon substrates were investigated in 1 M H2SO4<i solution under chopped light illumination. Optical and structural properties of the top absorber layer were systematically assessed after post-deposition isochronical annealing treatments. Samples exhibited a noticeable improvement of the opto-electronic properties after thermal treatments. In addition, an abrupt enhancement of the photocurrent was observed reaching a saturation value of 17 mA cm(-2) at -1.75 V vs. Ag/AgCl (3.5 M KCl). In this research we propose that this enhancement effect is associated to a charge transfer kinetic mechanism influenced by surface states and the p-type substrate. The latter most likely due to the space charge region extending beyond the absorber layer reaching the substrate. Current density-potential and electrochemical impedance spectroscopy measurements in dark revealed a reduction of the SiO2 native layer at cathodic potentials higher than -1 V vs. Ag/AgCl (3.5 M KCl), which contributes to the high charge transfer kinetic of the system. We believe that these results will contribute to understand the substrate influence in the PEC performance of top absorber layers in multilayer structures for solar water splitting.
dc.description.sponsorship Fondo Nacional de Desarrollo Científico y Tecnológico - Fondecyt
dc.identifier.doi https://doi.org/10.1088/1361-6463/abdb69
dc.identifier.uri https://hdl.handle.net/20.500.12390/2918
dc.language.iso eng
dc.publisher IOP Publishing LTD
dc.relation.ispartof Journal of Physics D-Applied Physics
dc.rights info:eu-repo/semantics/openAccess
dc.subject water splitting
dc.subject energy storage es_PE
dc.subject surface states es_PE
dc.subject amorphous semiconductors es_PE
dc.subject.ocde https://purl.org/pe-repo/ocde/ford#1.03.01
dc.title Analysis of the physical and photoelectrochemical properties of c-Si(p)/a-SiC:H(p) photocathodes for solar water splitting
dc.type info:eu-repo/semantics/article
dspace.entity.type Publication
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