Effect of Composition on the Spin Relaxation of Lead Halide Perovskites

• DOI: 10.1021/acs.jpclett.0c00004
• Publication Date: 2020-02-04T21:41:32Z
• Authors: Meng Zhou; Julio S. Sarmiento; Chengbin Fei; Xinwen Zhang; He Wang
• Keywords: 02 engineering and technology; 0210 nano-technology

Lead halide perovskites have been promising candidates in spintronics applications; however, the mechanism of spin relaxation is still unclear. Here, we compare temperature-dependent dynamics four perovskite films (XPbY3) with different compositions (X = CH3NH3, Cs; Y I, Br). The room-temperature net lifetime found to increase as molar mass decreases, indicating dominant role orbital coupling their relaxation. As temperature reduced from room 77 K, relaxations CH3NH3PbI3 and CsPbI3 are significantly slowed down while those CH3NH3PbBr3 CsPbBr3 only slightly changed. Based on analysis phonon scattering perovskites, it suggested that two mechanisms, Elliot-Yafet which flips upon momentum D'yakonov-Perel relaxes between scattering, responsible for XPbI3 XPbBr3 Cs), respectively.