Department of Physics & Astronomy, University of Utah, Salt Lake City, UT, 84112, USA.
College of Optical Sciences, University of Arizona, Tucson, AZ, 85721, USA.
Nat Commun. 2019 Jan 10;10(1):129. doi: 10.1038/s41467-018-07952-x.
Recently the hybrid organic-inorganic trihalide perovskites have shown remarkable performance as active layers in photovoltaic and other optoelectronic devices. However, their spin characteristic properties have not been fully studied, although due to the relatively large spin-orbit coupling these materials may show great promise for spintronic applications. Here we demonstrate spin-polarized carrier injection into methylammonium lead bromide films from metallic ferromagnetic electrodes in two spintronic-based devices: a 'spin light emitting diode' that results in circularly polarized electroluminescence emission; and a 'vertical spin valve' that shows giant magnetoresistance. In addition, we also apply a magnetic field perpendicular to the injected spins orientation for measuring the 'Hanle effect', from which we obtain a relatively long spin lifetime for the electrically injected carriers. Our measurements initiate the field of hybrid perovskites spin-related optoelectronic applications.
最近，混合有机-无机三卤化钙钛矿作为活性层在光伏和其他光电设备中表现出显著的性能。然而，它们的自旋特性尚未得到充分研究，尽管由于较大的自旋轨道耦合，这些材料在自旋电子学应用中可能具有很大的应用前景。在这里，我们在两种基于自旋电子学的器件中演示了从金属铁磁电极向甲基溴化铅薄膜注入自旋极化载流子：一个“自旋发光二极管”，导致圆偏振电致发光发射；以及一个“垂直自旋阀”，显示出巨大的磁电阻。此外，我们还施加了一个垂直于注入自旋方向的磁场，用于测量“汉勒效应”，从中我们获得了电注入载流子的相对较长的自旋寿命。我们的测量开启了混合钙钛矿自旋相关光电应用的领域。
