Tailoring Photoelectrochemical Performance and Stability of Cu(In,Ga)Se-2 Photocathode via TiO2-Coupled Buffer Layers

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dc.contributor.authorKoo, Bonhyeongko
dc.contributor.authorNam, Sung-Wookko
dc.contributor.authorHaight, Richardko
dc.contributor.authorKim, Seon Cheolko
dc.contributor.authorOh, Seungtaegko
dc.contributor.authorCho, Minhyungko
dc.contributor.authorOh, Jihunko
dc.contributor.authorLee, Jeong Yongko
dc.contributor.authorAhn, Byung Taeko
dc.contributor.authorShin, Byunghako
dc.date.accessioned2017-04-17T07:29:24Z-
dc.date.available2017-04-17T07:29:24Z-
dc.date.created2017-04-10-
dc.date.created2017-04-10-
dc.date.issued2017-02-
dc.identifier.citationACS APPLIED MATERIALS & INTERFACES, v.9, no.6, pp.5279 - 5287-
dc.identifier.issn1944-8244-
dc.identifier.urihttp://hdl.handle.net/10203/223290-
dc.description.abstractWe report on the photoelectrochemical (PEC) performance and stability of Cu(In,Ga)Se-2 (CIGS)-based photocathodes for photocatalytic hydrogen evolution from water. Various functional overlayers, such as CdS, TiO2, ZnxSnyOz, and a combination of the aforementioned, were applied on the CIGS to improve the performance and stability. We identified that the insertion of TiO2 overlayer on p-CIGS/n-buffer layers significantly improves the PEC performance. A multilayered photocathode consisting of CIGS/CdS/TiO2/Pt exhibited the best current-potential characteristics among the tested photocathodes, which demonstrates a power-saved efficiency of 2.63%. However, repeated linear sweep voltammetry resulted in degradation of performance. In this regard, we focused on the PEC durability issues through in-depth chemical characterization that revealed the degradation was attributed to atomic redistribution of elements constituting the photocathode, namely, in-diffusion of Pt catalysts, out-diffusion of elements from the CIGS, and removal of the metal-oxide layers; the best-performing CIGS/CdS/TiO2/Pt photocathode retained its initial performance until the TiO2 overlayer was removed. It was also found that the durability of CIGS photocathodes with a TiO2-coated metal-oxide buffer layer such as ZnxSnyOz was better than those with a TiO2-coated CdS, and the degradation mechanism was different, suggesting that the stability of a CIGS-based photocathode can be improved by careful design of the structure.-
dc.languageEnglish-
dc.publisherAMER CHEMICAL SOC-
dc.subjectSOLAR HYDROGEN-PRODUCTION-
dc.subjectTHIN-FILMS-
dc.subjectWATER REDUCTION-
dc.subjectCELLS-
dc.subjectEVOLUTION-
dc.subjectCIGS-
dc.subjectCDS-
dc.subjectTIO2-
dc.subjectSI-
dc.subjectPHOTOANODES-
dc.titleTailoring Photoelectrochemical Performance and Stability of Cu(In,Ga)Se-2 Photocathode via TiO2-Coupled Buffer Layers-
dc.typeArticle-
dc.identifier.wosid000394481800027-
dc.identifier.scopusid2-s2.0-85013078173-
dc.type.rimsART-
dc.citation.volume9-
dc.citation.issue6-
dc.citation.beginningpage5279-
dc.citation.endingpage5287-
dc.citation.publicationnameACS APPLIED MATERIALS & INTERFACES-
dc.identifier.doi10.1021/acsami.6b15168-
dc.contributor.localauthorOh, Jihun-
dc.contributor.localauthorLee, Jeong Yong-
dc.contributor.localauthorAhn, Byung Tae-
dc.contributor.localauthorShin, Byungha-
dc.contributor.nonIdAuthorNam, Sung-Wook-
dc.contributor.nonIdAuthorHaight, Richard-
dc.description.isOpenAccessN-
dc.type.journalArticleArticle-
dc.subject.keywordAuthorsolar water splitting-
dc.subject.keywordAuthorphotoelectrochemical hydrogen evolution-
dc.subject.keywordAuthorCu(In,Ga)Se-2 photocathode-
dc.subject.keywordAuthorstability-
dc.subject.keywordAuthoroverlayer-
dc.subject.keywordPlusSOLAR HYDROGEN-PRODUCTION-
dc.subject.keywordPlusTHIN-FILMS-
dc.subject.keywordPlusWATER REDUCTION-
dc.subject.keywordPlusCELLS-
dc.subject.keywordPlusEVOLUTION-
dc.subject.keywordPlusCIGS-
dc.subject.keywordPlusCDS-
dc.subject.keywordPlusTIO2-
dc.subject.keywordPlusSI-
dc.subject.keywordPlusPHOTOANODES-
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EEW-Journal Papers(저널논문)MS-Journal Papers(저널논문)
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