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

Tzu-Pei Chen; Jun-Xiao Lin; Cheng-Chieh Lin; Chi-Ying Lin; We-Chen Ke; Di-Yan Wang; Hua-Shu Hsu; Chia-Chun Chen; Chun-Wei Chen

doi:10.1021/acsami.0c20863

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

ACS Appl Mater Interfaces. 2021 Mar 3;13(8):10279-10286. doi: 10.1021/acsami.0c20863. Epub 2021 Feb 18.

Authors

Tzu-Pei Chen^{1

2

3}, Jun-Xiao Lin⁴, Cheng-Chieh Lin^{5

6}, Chi-Ying Lin¹, We-Chen Ke¹, Di-Yan Wang⁷, Hua-Shu Hsu⁴, Chia-Chun Chen⁸, Chun-Wei Chen^{1

5

9}

Affiliations

¹ Department of Materials Science and Engineering, National Taiwan University, Taipei 106, Taiwan.
² Department of Physics, National Taiwan University, Taipei 106, Taiwan.
³ Nano Science and Technology Program, Taiwan International Graduate Program, Academia Sinica and National Taiwan University, Taipei 115, Taiwan.
⁴ Department of Applied Physics, National Pingtung University, Pingtung 900, Taiwan.
⁵ International Graduate Program of Molecular Science and Technology, National Taiwan University (NTU-MST), Taipei 106, Taiwan.
⁶ Molecular Science and Technology Program, Taiwan International Graduate Program (TIGP) Academia Sinica, Taipei 11529, Taiwan.
⁷ Department of Chemistry, Tunghai University, Taichung 407, Taiwan.
⁸ Department of Chemistry, National Taiwan Normal University, Taipei 116, Taiwan.
⁹ Center of Atomic Initiative for New Materials (AI-MAT), National Taiwan University, Taipei 106, Taiwan.

PMID: 33599486
DOI: 10.1021/acsami.0c20863

Abstract

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.

Keywords: Faraday rotation; broadband; exciton; magnetic circular dichroism; two-dimensional perovskite.