Circularly polarized photoluminescence and Hanle effect measurements of spin relaxation in organic–inorganic hybrid perovskite films. Issue 12 (7th March 2018)

• Record Type: Journal Article
• Authors: Wang, Ruizhi; Hu, Shu; Yang, Xiao; Yan, Xiaoliang; Li, Heng; Sheng, ChuanXiang
• Is Part Of: Journal of materials chemistry. Volume 6:Issue 12(2018)
• Page Start: 2989
• Page End: 2995
• Publication Date: 2018-03-07
• Subjects: Materials -- Periodicals; Chemistry, Analytic -- Periodicals; Optical materials -- Research -- Periodicals; Electronics -- Materials -- Research -- Periodicals; 543.0284
• DOI: 10.1039/c7tc05916g
• Languages: English
• ISSNs: 2050-7526

Abstract

Abstract : Partial circularly polarized photoluminescence with polarization degree of 2% from CH3 NH3 PbBr3 film at 77 K is observed, excited using a circularly polarized 532 nm laser. Moreover, the Hanle effect is measured to study spin relaxation in CH3 NH3 PbBr3 film, yielding a spin lifetime of ∼240 ps at 77 K. Abstract : Partial circularly polarized photoluminescence (CPL) with a polarization degree ( P ) of 2% from CH3 NH3 PbBr3 film at 77 K is observed, excited by a circularly polarized 532 nm laser. However, P decreases to 0.3% when excited using a circularly polarized 447 nm laser, and to zero using a linear polarized laser. The Hanle effect is measured to study spin relaxation in CH3 NH3 PbBr3 film, yielding a spin lifetime of ∼240 ps at 77 K, which however becomes one order of magnitude smaller when the temperature increases to 110 K. The existence of a CPL that is dependent on the helicity of the excitation laser, and the unexpectedly long spin lifetime with large spin–orbit coupling, suggest the potential of hybrid perovskites for spintronic applications.