dc.contributor.authorThu Ha Do, T.
dc.contributor.authorGranados del Águila, A.
dc.contributor.authorCui, Chao
dc.contributor.authorXing, Jun
dc.contributor.authorNing, Zhijun
dc.contributor.authorXiong, Qihua
dc.date.accessioned2018-11-08T03:58:17Z
dc.date.available2018-11-08T03:58:17Z
dc.date.issued2017
dc.identifier.citationThu Ha Do, T., Granados del Águila, A., Cui, C., Xing, J., Ning, Z., & Xiong, Q. (2017). Optical study on intrinsic exciton states in high-quality CH3NH3PbBr3 single crystals. Physical Review B, 96(7), 075308-. doi:10.1103/PhysRevB.96.075308en_US
dc.identifier.issn2469-9950en_US
dc.identifier.urihttp://hdl.handle.net/10220/46598
dc.description.abstractOrganolead halide perovskites have emerged as potential building blocks for photovoltaic and optoelectronic devices. Yet the underlying fundamental physics is not well understood. There is lack of agreement on the electronic band structures and binding energies of coupled electron-hole pairs (excitons), which drive the photophysical processes. In this work, we conducted temperature-dependent reflectance and photoluminescence experiments on high-quality CH3NH3PbBr3 single crystals. Two direct optical transitions corresponding to intrinsic free-excitons are clearly resolved, showing excellent consistence between the low-temperature (T=10 K) reflectance and photoluminescence spectra. Remarkably, the excitons have different binding energies and behave oppositely with temperature, suggesting distinctive origins. Moreover, the asymmetric photoluminescence profile is counterintuitively dominated by the high-energy exciton that is explained by a long relaxation time between levels and by the favorable generation rate of electron-hole pairs at the high-energy band. Our study opens access to the intrinsic properties of CH3NH3PbBr3 and sheds light to reconcile the large range of binding energies reported on these emergent direct band-gap semiconductors.en_US
dc.description.sponsorshipNRF (Natl Research Foundation, S’pore)en_US
dc.description.sponsorshipMOE (Min. of Education, S’pore)en_US
dc.format.extent9 p.en_US
dc.language.isoenen_US
dc.relation.ispartofseriesPhysical Review Ben_US
dc.rights© 2017 American Physical Society (APS). This paper was published in Physical Review B and is made available as an electronic reprint (preprint) with permission of American Physical Society (APS). The published version is available at: [http://dx.doi.org/10.1103/PhysRevB.96.075308]. One print or electronic copy may be made for personal use only. Systematic or multiple reproduction, distribution to multiple locations via electronic or other means, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper is prohibited and is subject to penalties under law.en_US
dc.subjectOrganic Semiconductorsen_US
dc.subjectPerovskiteen_US
dc.subjectDRNTU::Science::Physicsen_US
dc.titleOptical study on intrinsic exciton states in high-quality CH3NH3PbBr3 single crystalsen_US
dc.typeJournal Article
dc.contributor.schoolSchool of Electrical and Electronic Engineeringen_US
dc.contributor.schoolSchool of Physical and Mathematical Sciencesen_US
dc.identifier.doihttp://dx.doi.org/10.1103/PhysRevB.96.075308
dc.description.versionPublished versionen_US
dc.contributor.organizationNanoelectronics Centre of Excellenceen_US


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