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Liao CH, Chen CH, Bing J, Bailey C, Lin YT, Pandit TM, Granados L, Zheng J, Tang S, Lin BH, Yen HW, McCamey DR, Kennedy BJ, Chueh CC, Ho-Baillie AWY. Inorganic-Cation Pseudohalide 2D Cs 2 Pb(SCN) 2 Br 2 Perovskite Single Crystal. Adv Mater 2022; 34:e2104782. [PMID: 34866252 DOI: 10.1002/adma.202104782] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/22/2021] [Revised: 11/23/2021] [Indexed: 06/13/2023]
Abstract
Most of the reported 2D Ruddlesden-Popper (RP) lead halide perovskites with the general formula of An +1 Bn X3 n +1 (n = 1, 2, …) comprise layered perovskites separated by A-site-substituted organic spacers. To date, only a small number of X-site-substituted RP perovskites have been reported. Herein, the first inorganic-cation pseudohalide 2D phase perovskite single crystal, Cs2 Pb(SCN)2 Br2 , is reported. It is synthesized by the antisolvent vapor-assisted crystallization (AVC) method at room temperature. It exhibits a standard single-layer (n = 1) Ruddlesden-Popper structure described in space group of Pmmn (#59) and has a small separation (d = 1.69 Å) between the perovskite layers. The SCN- anions are found to bend the 2D Pb(SCN)2 Br2 framework slightly into a kite-shaped octahedron, limiting the formation of a quasi-2D perovskite structure (n > 1). This 2D single crystal exhibits a reversible first-order phase transformation to 3D CsPbBr3 (Pm3m #221) at 450 K. It has a low exciton binding energy of 160 meV-one of the lowest for 2D perovskites (n = 1). A Cs2 Pb(SCN)2 Br2 -single-crystal photodetector is demonstrated with respectable responsivity of 8.46 mA W-1 and detectivity of ≈1.2 × 1010 Jones at a low bias voltage of 0.5 V.
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Affiliation(s)
- Chwen-Haw Liao
- School of Physics University of Sydney Nano Institute, The University of Sydney, Sydney, NSW, 2006, Australia
- Department of Chemical Engineering, National Taiwan University, Taipei, 106, Taiwan
- Advanced Research Center for Green Materials Science and Technology, National Taiwan University, Taipei, 106, Taiwan
| | - Chiung-Han Chen
- Department of Chemical Engineering, National Taiwan University, Taipei, 106, Taiwan
- Advanced Research Center for Green Materials Science and Technology, National Taiwan University, Taipei, 106, Taiwan
| | - Jueming Bing
- School of Physics University of Sydney Nano Institute, The University of Sydney, Sydney, NSW, 2006, Australia
| | - Christopher Bailey
- ARC Centre of Excellence in Exciton Science, School of Physics, University of New South Wales, Sydney, NSW, 2052, Australia
| | - Yi-Ting Lin
- Advanced Research Center for Green Materials Science and Technology, National Taiwan University, Taipei, 106, Taiwan
- Department of Materials Science and Engineering, National Taiwan University, Taipei, 106, Taiwan
| | - Twishi Mukul Pandit
- School of Physics University of Sydney Nano Institute, The University of Sydney, Sydney, NSW, 2006, Australia
- School of Chemistry, The University of Sydney, Sydney, NSW, 2006, Australia
| | - Laura Granados
- School of Physics University of Sydney Nano Institute, The University of Sydney, Sydney, NSW, 2006, Australia
| | - Jianghui Zheng
- School of Physics University of Sydney Nano Institute, The University of Sydney, Sydney, NSW, 2006, Australia
| | - Shi Tang
- School of Physics University of Sydney Nano Institute, The University of Sydney, Sydney, NSW, 2006, Australia
| | - Bi-Hsuan Lin
- National Synchrotron Radiation Research Center, Hsinchu, 30076, Taiwan
| | - Hung-Wei Yen
- Advanced Research Center for Green Materials Science and Technology, National Taiwan University, Taipei, 106, Taiwan
- Department of Materials Science and Engineering, National Taiwan University, Taipei, 106, Taiwan
| | - Dane R McCamey
- ARC Centre of Excellence in Exciton Science, School of Physics, University of New South Wales, Sydney, NSW, 2052, Australia
| | - Brendan J Kennedy
- School of Chemistry, The University of Sydney, Sydney, NSW, 2006, Australia
| | - Chu-Chen Chueh
- Department of Chemical Engineering, National Taiwan University, Taipei, 106, Taiwan
- Advanced Research Center for Green Materials Science and Technology, National Taiwan University, Taipei, 106, Taiwan
| | - Anita W Y Ho-Baillie
- School of Physics University of Sydney Nano Institute, The University of Sydney, Sydney, NSW, 2006, Australia
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