@article{33403,
  keywords = {Temperature, Faraday effect, Perovskite, Probes, Polarization, Nanotechnology, Magnetic moments, Spin polarization, Rotation, Magnetoelectronics, Semiconductor quantum wells, Electrospinning, Light emission, Pinch effect, Carrier diffusion length, Electron spin polarization, Electron-spin relaxation, Low temperature solutions, Photoinduced magnetization, Polycrystalline perovskite, Pump probe, Time-resolved Faraday rotation, Spin dynamics},
  author = {D Giovanni and H Ma and J Chua and M Grätzel and Ramamoorthy Ramesh and S Mhaisalkar and N Mathews and T.C Sum},
  title = {Highly spin-polarized carrier dynamics and ultralarge photoinduced magnetization in CH3NH3PbI3 perovskite thin films},
  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 photoinduced Faraday rotation as large as 10°/m at 200 K (at wavelength γ = 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 ultrafast spin switches in spintronics applications. © 2015 American Chemical Society.},
  year = {2015},
  journal = {Nano Letters},
  volume = {15},
  number = {3},
  pages = {1553-1558},
  publisher = {American Chemical Society},
  issn = {15306984},
  doi = {10.1021/nl5039314},
  note = {cited By 75},
  language = {eng},
}