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Title: Highly spin-polarized carrier dynamics and ultra-large photoinduced magnetization in CH3NH3PbI3 perovskite thin films
Authors: Giovanni, David
Ma, Hong
Chua, Julianto
Grätzel, Michael
Ramesh, Ramamoorthy
Mhaisalkar, Subodh
Mathews, Nripan
Sum, Tze Chien
Keywords: DRNTU::Engineering::Materials::Microelectronics and semiconductor materials::Thin films
Issue Date: 2015
Source: Giovanni, 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.
Series/Report no.: Nano letters
Abstract: Low 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.
DOI: 10.1021/nl5039314
Schools: School of Materials Science & Engineering 
School of Physical and Mathematical Sciences 
Research Centres: Energy Research Institute @ NTU (ERI@N) 
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: [].
Fulltext Permission: open
Fulltext Availability: With Fulltext
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