Strong\nExcitonic Magneto-Optic Effects in Two-Dimensional\nOrganic–Inorganic Hybrid Perovskites

Abstract

This\nwork demonstrates the strong excitonic magneto-optic (MO)\neffects of magnetic circular dichroism (MCD) and Faraday rotation\n(FR) in nonmagnetic two-dimensional (2D) organic–inorganic\nhybrid Ruddlesden–Popper perovskites (RPPs) at room temperature.\nDue to their strong and sharp excitonic absorption as a result of\nunique quantum well structures of 2D RPPs, sizeable linear excitonic\nMO effects of MCD and FR can be observed at room temperature under\na low magnetic field (<1 T) compared with their three-dimensional\ncounterpart. In addition, since the band gaps of 2D organic–inorganic\nhybrid perovskites can be manipulated either by changing the number <i>n</i> of inorganic octahedral slabs per unit cell or through\nhalide engineering, linear excitonic MO effects of 2D-RPPs can be\nobserved through the broadband spectral ranges of visible light. Our\nresult may pave the way for the promising research field of MO and\nmagneto-optoelectronic applications based on 2D organic–inorganic\nhybrid perovskites with facile solution processes.