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Groove-assisted solution growth of lead bromide perovskite aligned nanowires

Mater. Chem. Front., 3, 1754 (2019)

DOI: doi.org/10.1039/c9qm00210c

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Groove-assisted solution growth of lead bromide perovskite aligned nanowires

I Rodriguez, R Fenollosa, F. Ramiro-Manzano, R. García-Aboal, P. Atienzar and F. J. Meseguer

Abstract

High refractive index nanowires are very attractive because of their waveguiding properties and their multiple applications. In this sense, metal halide perovskites, an emerging and appealing optoelectronic material, have also been tailored into nanowire structures. Here, we present an easy, low-cost and versatile method that has made possible to achieve nanowires of controlled and uniform width. The method has been applied here to all-inorganic and hybrid lead bromide perovskite (CsPbBr3 and CH3NH3PbBr3 respectively) materials. The procedure is based on the spin coating of precursor solutions, at room temperature, on a PDMS replica of the periodic grooves and lands of commercially available Compact Disc (CD) or Digital Versatile Disc (DVD) polycarbonate plates. The method can be applied for the synthesis of other material nanowires before being transferred onto other substrates. The obtained CsPbBr3 and CH3NH3PbBr3 nanowires exhibit high photoluminescence and guiding light properties along the material.

Summary

The article describes a simple and low-cost method of obtaining metal halide perovskite nanowires with different shapes and dimensions. The nanowires can be used for applications in optoelectronics, photonic devices, and energy generation due to their unique electrical and optical properties.
The nanowires are obtained by the spatial confinement of precursor solutions in submicrometer size grooves imprinted on the polycarbonate sheet of commercial recordable DVD or CD plates. The groove-assisted solution growth method allowed for the alignment of the nanowires and control of their dimensions. The study also includes a theoretical calculation. By fitting this model, several conclusions have been extracted.We found that the photoluminescence properties of the nanowires were dependent on their dimensions and shape. In our case, the presence of a secondary peak could be due to photon recycling (absorption-reemission) or spurious acquisition of unguided PL from unwanted reflections or spurious excitation by the tail of the laser spot. The contribution of this additional peak could be modeled as the initial conditions of light emission (without the contribution of light absorption or red-shift due to light propagation).
In conclusion , the article describes a low-cost and simple method of producing nanowires with controlled and uniform sizes at room temperature using a PDMS replica of DVD and CD profiles as substrates. The method can be used to create all-inorganic lead halide CsPbBr3 and hybrid MAPbBr3 perovskite nanowires, as well as other material nanowires. The optical studies of the nanowires showed a typical PL signal for these materials, and light can be excited at any point of the nanowire and guided along with it towards its ends. Transport of light has been observed along the material for more than 12 μm, which is supported by theoretical simulation.

Figures

grown of hybrid perovskite in DVD templates

Preparation and features of the PDMS template from DVDs or CDs

Preparation procedure of the MAPbBr3 and CsPbBr3 nanowires in the grooves of hydrophilized PDMS templates obtained by eplication of the CD or DVD profiles.

Polycrystalline CsPbBr3 nanowire characteristics grown on a DVD template

Light propagation of hybrid perovskite grown in a DVD. Photon recycling or excitation from the pump laser

Light propagation of hybrid perovskite grown in a DVD. P0 - Photon recycling or excitation from the pump laser

License/Copyright

The abstract, figures and accepted manuscript have been reproduced from Ref. Mater. Chem. Front., 3, 1754 (2019) with permission from the Royal Society of Chemistry.