290 0

Full metadata record

DC FieldValueLanguage
dc.contributor.author전형탁-
dc.date.accessioned2018-03-09T04:16:20Z-
dc.date.available2018-03-09T04:16:20Z-
dc.date.issued2013-07-
dc.identifier.citationJournal of Physical Chemistry C, Vol.117, No.33 [2013], p16811-16819en_US
dc.identifier.issn1932-7447-
dc.identifier.urihttp://pubs.acs.org/doi/10.1021/jp405207e-
dc.identifier.urihttp://hdl.handle.net/20.500.11754/44040-
dc.description.abstractBand gap tuning of the wide band gap semiconductor, TiO2, has great importance due to its versatile properties in solar cell applications. Visible light activity of TiO2 can enhance the efficiency of the third-generation solar cells by acting itself as light absorbing material. In this study, we demonstrate a surface structure modification and band gap tuning of TiO2 nanotube arrays (TNTA) by anodization accompanied by a short-term, quick annealing process. This TNTA shows absorption both in the UV and entire visible range (400-700 nm, an increase by 350%). The effective band gap is found to be 1.7 eV. Through a detailed analysis we show that the significantly enhanced visible light absorption in the entire visible range is due to the substitutional and interstitial carbon atoms on the surface which introduces a structural disorder and localized states at the surface compared to the bulk. Based on the results from photoemission spectra, the probable band gap modeling shows a band bending at the surface. This behavior points to the excessive electronic conduction at the surface which has both merits and demerits in the applications of TNTAs in photocatalytic and photovoltaics in terms of surface recombination. This is confirmed by a solar cell device fabrication and testing.en_US
dc.description.sponsorshipThis study was supported by the National Research Foundation of Korea (NRF) grant funded by the Korean Government (MEST) (No.2012-0005474) and also supported by the Basic Science Program (NRF-2012R1A1A1005014) through the National Research Foundation (NRF) of MEST, Republic of Korea. S.K. thanks BK 21 program for financial support.en_US
dc.language.isoenen_US
dc.publisherAMER CHEMICAL SOC, 1155 16TH ST, NW, WASHINGTON, DC 20036 USAen_US
dc.subjectSENSITIZED SOLAR-CELLSen_US
dc.subjectPHOTOCATALYTIC ACTIVITYen_US
dc.subjectTITANIUM-DIOXIDEen_US
dc.subjectCHARGE-TRANSPORTen_US
dc.subjectNANOWIRE ARRAYSen_US
dc.subjectWATERen_US
dc.subjectFILMSen_US
dc.subjectPHOTOLUMINESCENCEen_US
dc.subjectNANOCOMPOSITESen_US
dc.subjectNANOPARTICLESen_US
dc.titleSignificant Enhancement in Visible Light Absorption of TiO2 Nanotube Arrays by Surface Band Gap Tuningen_US
dc.typeArticleen_US
dc.relation.no33-
dc.relation.volume117-
dc.identifier.doi10.1021/jp405207e-
dc.relation.page16811-16819-
dc.relation.journalJOURNAL OF PHYSICAL CHEMISTRY C-
dc.contributor.googleauthorKurian, S.-
dc.contributor.googleauthorJeon, H.-
dc.contributor.googleauthorSeo, H.-
dc.relation.code2013010915-
dc.sector.campusS-
dc.sector.daehakCOLLEGE OF ENGINEERING[S]-
dc.sector.departmentDIVISION OF MATERIALS SCIENCE AND ENGINEERING-
dc.identifier.pidhjeon-
dc.identifier.researcherID14325684000-
Appears in Collections:
COLLEGE OF ENGINEERING[S](공과대학) > MATERIALS SCIENCE AND ENGINEERING(신소재공학부) > Articles
Files in This Item:
There are no files associated with this item.
Export
RIS (EndNote)
XLS (Excel)
XML


qrcode

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.

BROWSE