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dc.contributor.authorChi, Xiaoen_US
dc.contributor.authorLeng, Kaien_US
dc.contributor.authorWu, Boen_US
dc.contributor.authorShi, Dongen_US
dc.contributor.authorChoy, Yufongen_US
dc.contributor.authorChen, Zhongxinen_US
dc.contributor.authorChen, Zhihuien_US
dc.contributor.authorYu, Xiaojiangen_US
dc.contributor.authorYang, Pingen_US
dc.contributor.authorXu, Qing-Huaen_US
dc.contributor.authorSum, Tze Chienen_US
dc.contributor.authorRusydi, Andrivoen_US
dc.contributor.authorLoh, Kian Pingen_US
dc.identifier.citationChi, X., Leng, K., Wu, B., Shi, D., Choy, Y., Chen, Z., . . . Loh, K. P. (2018). Elucidating surface and bulk emission in 3D hybrid organic – inorganic lead bromide perovskites. Advanced Optical Materials, 6(15), 1800470-. doi:10.1002/adom.201800470en_US
dc.description.abstractThree dimensional (3D) hybrid organic–inorganic lead halide perovskites (HOIP) have emerged in recent years as promising materials for a wide variety of optoelectronic applications. However, the photoluminescence energies in bromide‐based HOIP have been reported to vary in the range from 2.16 to 2.35 eV. The occurrence of surface reconstructions due to uncompensated surface ionic charges may change the photo‐physical properties of the surface regions, but this has not been studied in detail. Herein, by performing angle‐dependent photoluminescence (PL) and spectroscopic ellipsometry of single‐crystal as well as polycrystalline HOIP crystals, the intrinsic excitonic emissions from the surface and bulk regions are clearly identified. It is verified that the high energy PL at 2.31 eV originates from a phase‐modified surface region. The large absorption coefficient of perovskite results in signal depletion of the lower energy PL at 2.16 eV, which originates from the bulk. High resolution synchrotron X‐ray diffraction reveals that air‐exposed HOIP crystals form a multilayer structure consisting of PbBr2, and an interfacial layer of orthorhombic phase, while the bulk crystal remains cubic phase. This study provides the unambiguous identification of a phase‐modified surface region with a larger band gap than the bulk and which dominates the excitonic emission in HOIP crystals.en_US
dc.description.sponsorshipASTAR (Agency for Sci., Tech. and Research, S’pore)en_US
dc.description.sponsorshipMOE (Min. of Education, S’pore)en_US
dc.relation.ispartofAdvanced Optical Materialsen_US
dc.rights© 2018 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim. All rights reserved.en_US
dc.titleElucidating surface and bulk emission in 3D hybrid organic – inorganic lead bromide perovskitesen_US
dc.typeJournal Articleen
dc.contributor.schoolSchool of Physical and Mathematical Sciencesen_US
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