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dc.contributor.authorThilakan, Anusha Puliparambilen_US
dc.contributor.authorLi, Jia-Xingen_US
dc.contributor.authorChen, Tzu-Peien_US
dc.contributor.authorLi, Shao-Sianen_US
dc.contributor.authorChen, Chun-Weien_US
dc.contributor.authorOsada, Minoruen_US
dc.contributor.authorTsukagoshi, Kazuhitoen_US
dc.contributor.authorSasaki, Takayoshien_US
dc.contributor.authorYabushita, Atsushien_US
dc.contributor.authorWu, Kaung-Hsiungen_US
dc.contributor.authorLuo, Chih-Weien_US
dc.date.accessioned2019-08-02T02:15:31Z-
dc.date.available2019-08-02T02:15:31Z-
dc.date.issued2019-06-19en_US
dc.identifier.issn1944-8244en_US
dc.identifier.urihttp://dx.doi.org/10.1021/acsami.9b02434en_US
dc.identifier.urihttp://hdl.handle.net/11536/152210-
dc.description.abstractThe inherent instability of UV-induced degradation in TiO2-based perovskite solar cells was largely improved by replacing the anatase-phase compact TiO2 layer with an atomic sheet transport layer (ASTL) of two-dimensional (2D) Ti1-delta O2. The vital role of microscopic carrier dynamics that govern the UV stability of perovskite solar cells was comprehensively examined in this work by performing time-resolved pump-probe spectroscopy. In conventional perovskite solar cells, the presence of a UV-active oxygen vacancy in compact TiO2 prohibits current generation by heavily trapping electrons after UV degradation. Conversely, the dominant vacancy type in the 2D Ti1-delta O2 ASTL is a titanium vacancy, which is a shallow acceptor and is not UV-sensitive. Therefore, it significantly suppresses carrier recombination and extends UV stability in perovskite solar cells with a 2D Ti1-delta O2 ASTL. Other carrier dynamics, such as electron diffusion, electron injection, and hot hole transfer processes, were found to be less affected by UV irradiation. Quantitative pump-probe data clearly show a correlation between the carrier dynamics and UV aging of perovskite solar cells, thus providing a profound insight into the factors driving UV-induced degradation in perovskite solar cells and the origin of its performance.en_US
dc.language.isoen_USen_US
dc.subjectperovskite solar cellen_US
dc.subjectultrafast mechanismen_US
dc.subjectpump-probe techniqueen_US
dc.subjectUV degradationen_US
dc.subjecttwo-dimensional metal oxideen_US
dc.subjectelectron transport layeren_US
dc.titleOrigin of Extended UV Stability of 2D Atomic Layer Titania-Based Perovskite Solar Cells Unveiled by Ultrafast Spectroscopyen_US
dc.typeArticleen_US
dc.identifier.doi10.1021/acsami.9b02434en_US
dc.identifier.journalACS APPLIED MATERIALS & INTERFACESen_US
dc.citation.volume11en_US
dc.citation.issue24en_US
dc.citation.spage21473en_US
dc.citation.epage21480en_US
dc.contributor.department交大名義發表zh_TW
dc.contributor.department電子物理學系zh_TW
dc.contributor.departmentNational Chiao Tung Universityen_US
dc.contributor.departmentDepartment of Electrophysicsen_US
dc.identifier.wosnumberWOS:000472683300021en_US
dc.citation.woscount0en_US
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