Interpretation of Mott-Schottky plots of photoanodes for water splitting
comunitat-uji-handle:10234/9
comunitat-uji-handle2:10234/160292
comunitat-uji-handle3:10234/160293
comunitat-uji-handle4:
INVESTIGACIONMetadatos
Título
Interpretation of Mott-Schottky plots of photoanodes for water splittingFecha de publicación
2022-03-31Editor
The Royal Society of ChemistryCita bibliográfica
RAVISHANKAR, Sandheep; BISQUERT, Juan; KIRCHARTZ, Thomas. Interpretation of Mott–Schottky plots of photoanodes for water splitting. Chemical Science, 2022, vol. 13, no 17, p. 4828-4837.Tipo de documento
info:eu-repo/semantics/articleVersión
info:eu-repo/semantics/publishedVersionPalabras clave / Materias
Resumen
A large body of literature reports that both bismuth vanadate and haematite photoanodes are semiconductors with an extremely high doping density between 1018 and 1021 cm−3. Such values are obtained from Mott–Schottky ... [+]
A large body of literature reports that both bismuth vanadate and haematite photoanodes are semiconductors with an extremely high doping density between 1018 and 1021 cm−3. Such values are obtained from Mott–Schottky plots by assuming that the measured capacitance is dominated by the capacitance of the depletion layer formed by the doping density within the photoanode. In this work, we show that such an assumption is erroneous in many cases because the injection of electrons from the collecting contact creates a ubiquitous capacitance step that is very difficult to distinguish from that of the depletion layer. Based on this reasoning, we derive an analytical resolution limit that is independent of the assumed active area and surface roughness of the photoanode, below which doping densities cannot be measured in a capacitance measurement. We find that the reported doping densities in the literature lie very close to this value and therefore conclude that there is no credible evidence from capacitance measurements that confirms that bismuth vanadate and haematite photoanodes contain high doping densities. [-]
Publicado en
Chem. Sci., 2022,13Entidad financiadora
German Research Foundation (DFG), Walter-Benjamin fellowship | Helmholtz Association
Código del proyecto o subvención
462572437 | POF-IV program | 491111487
Derechos de acceso
© 2022 The Author(s). Published by the Royal Society of Chemistry
info:eu-repo/semantics/openAccess
info:eu-repo/semantics/openAccess
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