Photodoping and Fast Charge Extraction in Ionic Carbon Nitride Photoanodes

dc.bibliographicCitation.firstPage2105369eng
dc.bibliographicCitation.issue45eng
dc.bibliographicCitation.journalTitleAdvanced Functional Materialseng
dc.bibliographicCitation.volume31eng
dc.contributor.authorAdler, Christiane
dc.contributor.authorSelim, Shababa
dc.contributor.authorKrivtsov, Igor
dc.contributor.authorLi, Chunyu
dc.contributor.authorMitoraj, Dariusz
dc.contributor.authorDietzek, Benjamin
dc.contributor.authorDurrant, James R.
dc.contributor.authorBeranek, Radim
dc.date.accessioned2021-11-25T13:33:25Z
dc.date.available2021-11-25T13:33:25Z
dc.date.issued2021
dc.description.abstractIonic carbon nitrides based on poly(heptazine imides) (PHI) represent a vigorously studied class of materials with possible applications in photocatalysis and energy storage. Herein, for the first time, the photogenerated charge dynamics in highly stable and binder-free PHI photoanodes using in operando transient photocurrents and spectroelectrochemical photoinduced absorption measurements is studied. It is discovered that light-induced accumulation of long-lived trapped electrons within the PHI film leads to effective photodoping of the PHI film, resulting in a significant improvement of photocurrent response due to more efficient electron transport. While photodoping is previously reported for various semiconductors, it has not been shown before for carbon nitride materials. Furthermore, it is found that the extraction kinetics of untrapped electrons are remarkably fast in these PHI photoanodes, with electron extraction times (ms) comparable to those measured for commonly employed metal oxide semiconductors. These results shed light on the excellent performance of PHI photoanodes in alcohol photoreforming, including very negative photocurrent onset, outstanding fill factor, and the possibility to operate under zero-bias conditions. More generally, the here reported photodoping effect and fast electron extraction in PHI photoanodes establish a strong rationale for the use of PHI films in various applications, such as bias-free photoelectrochemistry or photobatteries. © 2021 The Authors. Advanced Functional Materials published by Wiley-VCH GmbHeng
dc.description.versionpublishedVersioneng
dc.identifier.urihttps://oa.tib.eu/renate/handle/123456789/7500
dc.identifier.urihttps://doi.org/10.34657/6547
dc.language.isoengeng
dc.publisherWeinheim : Wiley-VCHeng
dc.relation.doihttps://doi.org/10.1002/adfm.202105369
dc.relation.essn1099-0712
dc.relation.essn1616-3028
dc.rights.licenseCC BY 4.0 Unportedeng
dc.rights.urihttps://creativecommons.org/licenses/by/4.0/eng
dc.subject.ddc620eng
dc.subject.ddc540eng
dc.subject.ddc530eng
dc.subject.otherbias-free photoelectrochemistryeng
dc.subject.othercarbon nitrideeng
dc.subject.othercharge extractioneng
dc.subject.otherphotoanodeeng
dc.subject.otherphotodopingeng
dc.titlePhotodoping and Fast Charge Extraction in Ionic Carbon Nitride Photoanodeseng
dc.typeArticleeng
dc.typeTexteng
tib.accessRightsopenAccesseng
wgl.contributorIPHTeng
wgl.subjectIngenieurwissenschafteneng
wgl.typeZeitschriftenartikeleng
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