Strong Excitonic Magneto-Optic Effects in Two-Dimensional Organic–Inorganic Hybrid Perovskites

• Published in: ACS applied materials & interfaces Vol. 13; no. 8; pp. 10279 - 10286
• Main Authors: Chen, Tzu-Pei, Lin, Jun-Xiao, Lin, Cheng-Chieh, Lin, Chi-Ying, Ke, We-Chen, Wang, Di-Yan, Hsu, Hua-Shu, Chen, Chia-Chun, Chen, Chun-Wei
• Format: Journal Article
• Language: English
• Published: United States American Chemical Society 03.03.2021
• Subjects: Functional Nanostructured Materials (including low-D carbon); Faraday rotation; exciton; broadband; two-dimensional perovskite; magnetic circular dichroism
• ISSN: 1944-8244; 1944-8252
• DOI: 10.1021/acsami.0c20863

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