dc.contributor.authorGiovanni, David
dc.contributor.authorMa, Hong
dc.contributor.authorChua, Julianto
dc.contributor.authorGrätzel, Michael
dc.contributor.authorRamesh, Ramamoorthy
dc.contributor.authorMhaisalkar, Subodh
dc.contributor.authorMathews, Nripan
dc.contributor.authorSum, Tze Chien
dc.identifier.citationGiovanni, D., Ma, H., Chua, J., Grätzel, M., Ramesh, R., Mhaisalkar, S., et al. (2015). Highly spin-polarized carrier dynamics and ultra-large photoinduced magnetization in CH3NH3PbI3 perovskite thin films. Nano letter, 5 (3), 1553–1558.en_US
dc.description.abstractLow temperature solution-processed organic-inorganic halide perovskite CH3NH3PbI3 has demonstrated great potential for photovoltaics and light emitting devices. Recent discoveries of long ambipolar carrier diffusion lengths and the prediction of the Rashba effect in CH3NH3PbI3, that possesses large spin-orbit coupling, also point to a novel semiconductor system with highly promising properties for spin-based applications. Through circular pump-probe measurements, we demonstrate that highly polarized electrons of total angular momentum (J) with an initial degree of polarization Pini ~ 90% (i.e., –30% degree of electron spin polarization) can be photogenerated in perovskites. Time-resolved Faraday rotation measurements reveal photo-induced Faraday rotation as large as 10°/μm at 200 K (at wavelength λ = 750 nm) from an ultrathin 70 nm film. These spin polarized carrier populations generated within the polycrystalline perovskite films, relax via intraband carrier spin-flip through the Elliot-Yafet mechanism. Through a simple two-level model, we elucidate the electron spin relaxation lifetime to be ~7 ps and that of the hole is ~1 ps. Our work highlights the potential of CH3NH3PbI3 as a new candidate for spintronics applications such as ultrafast spin switches, spin aligners or filters and possibly spin-polarized light emitters.en_US
dc.relation.ispartofseriesNano lettersen_US
dc.rights© 2015 American Chemical Society. This is the author created version of a work that has been peer reviewed and accepted for publication by Nano Letter, American Chemical Society. It incorporates referee’s comments but changes resulting from the publishing process, such as copyediting, structural formatting, may not be reflected in this document. The published version is available at: [http://dx.doi.org/10.1021/nl5039314].en_US
dc.subjectDRNTU::Engineering::Materials::Microelectronics and semiconductor materials::Thin films
dc.titleHighly spin-polarized carrier dynamics and ultra-large photoinduced magnetization in CH3NH3PbI3 perovskite thin filmsen_US
dc.typeJournal Article
dc.contributor.researchEnergy Research Institute @NTU
dc.contributor.schoolSchool of Materials Science and Engineeringen_US
dc.contributor.schoolSchool of Physical and Mathematical Sciencesen_US
dc.description.versionAccepted versionen_US

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