Magnetoresistance of (CH3NH3)PbI3 coated La0.67Sr0.33MnO3 granular composites

Abstract

There have been increasing research activities on organic spintronics, due to the long spin relaxation time in organic semiconductors which allows retaining the spin information. Generally, the widely used organic semiconductors are tris-(8, hydroxyquinoline) aluminum (Alq3), oleic acid, poly (3-hexyl thiophene)(RRP3HT), etc. Recently, the inorganic-organic perovskite family of materials taking the form ABX₃ (A = CH₃NH₃⁺; B = Pb²⁺; and X=Cl^-, I^-, and/or Br) have attracted intensive research interests, due to the dramatically increasing efficiency in the hybric solar cell [1]. It has been reported that CH₃NH₃PbI_3-xCl_x has very long electron-hole diffusion length (~100 nm for CH₃NH₃PbI₃ and ~ 1 μm for CH₃NH₃PbI_3-xCl_x) [1], suggesting the possible applicaton in organic spintronics. In this work, we prepared the CH₃NH₃PbI₃ coated La_0.67Sr_0.33MnO₃ (LSMO) granular composites, and the magnetoresistance (MR) was studied.