Synthesis of halide perovskite microwires via methylammonium cations reaction
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RESEARCH ARTICLE
Synthesis of halide perovskite microwires via methylammonium cations reaction Wei WANG, Jinhui GONG, Siyu GUO, Lin JIANG, Shaochao LIU, and Li WANG (✉) Department of Materials Science and Engineering, Nanchang University, Nanchang 330031, China
© Higher Education Press 2020
ABSTRACT: Low-dimensional halide perovskites (HPs) have received considerable attention in recent years due to their novel physical properties such as compositional flexibility, high quantum yield, quantum size effects and superior charge transport. Here we show room temperature solution synthesis of 1D organic-inorganic lead bromide perovskite microwires (MWs). Our method uses acetone as a reactant, and when CH3NH3PbBr3 is immersed, acetone reacts with CH3NH3+ cations in the CH3NH3PbBr3 single crystal by the dehydration condensation. The reaction generates a large (CH3)2C = NHCH3+ A-site which cannot be accommodated by the cuboctahedron formed by the corner-sharing [PbBr6]4- octahedral, leading to the transition of corner-sharing octahedra to face-sharing triangular prism and the crystal structure transformation from 3D to 1D. The formation process of (CH3)2C = NHCH3PbBr3 MWs does not involve any ligands, templates or catalysts. A two-terminal memory device was constructed using the (CH3)2C = NHCH3PbBr3 MWs, showing great potential of the method in fabrication of electronic and optoelectronic devices. KEYWORDS: organic–inorganic halide perovskite; one-dimensional; microwire; cation reaction; memory device
Contents 1 Introduction 2 Materials and methods 2.1 Materials 2.2 Growth of CH3NH3PbBr3 single crystals 2.3 Synthesis of (CH3)2C = NHCH3PbBr3 MWs 2.4 Device fabrication 2.5 Characterization 3 Results and discussion 3.1 Characterization results of (CH3)2C = NHCH3PbBr3 MWs Received May 22, 2020; accepted July 5, 2020 E-mail: [email protected]
Crystal structure of (CH3)2C = NHCH3PbBr3 MWs 3.3 Device testing 4 Conclusions Acknowledgements References Supplementary information 3.2
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Introduction
Organic–inorganic halide perovskites (OIHPs) possess the chemical formula ABX3, where A is a monovalent cation (CH3NH3+, CH(NH2)2+, or C6H5(CH2)2NH3+), B is a bivalent p-block metal (Pb or Sn), and X is a halide anion. Cation A occupies the cavity of cuboctahedron formed by
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Front. Mater. Sci.
four adjacent BX6 octahedra through corner-sharing. OIHPs have shown excellent optoelectronic properties and been widely studied especially for photovoltaics. The power conversion efficiency (PCE) of perovskite-based solar cells has risen explosively from 3.8% to over 25.2% in recent years [1–3]. The excellent light absorption coefficient [4–5], long charge carrier diffusion length [6–7], long lifetime [8–9] and high quantum efficiency [10] of OIHPs make them suitable for other applications such as photondetection [10–11], memory devices [12], light emitting diodes (LEDs) [13–14], and lasers [15–16]. However, the devices fabricated using halide perovskite (HP) thin films have been found with serious drawbacks such as current–voltage (I–V) hysteresi
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