Controlled growth of CH${}_3$NH${}_3$PbI${}_3$ nanowires in arrays of open nanofluidic channels

Abstract

Spatial positioning of nanocrystal building blocks on a solid surface is a prerequisite for assembling individual nanoparticles into functional devices. Here, we report on the graphoepitaxial liquid-solid growth of nanowires of the photovoltaic compound CH${}_3$NH${}_3$PbI${}_3$ in open nanofluidic channels. The guided growth, visualized in real-time with a simple optical microscope, undergoes through a metastable solvatomorph formation in polar aprotic solvents. The presently discovered crystallization leads to the fabrication of mm2-sized surfaces composed of perovskite nanowires having controlled sizes, cross-sectional shapes, aspect ratios and orientation which have not been achieved thus far by other deposition methods. The automation of this general strategy paves the way towards fabrication of wafer-scale perovskite nanowire thin films well-suited for various optoelectronic devices, e.g. solar cells, lasers, light-emitting diodes and photodetectors.

References in corpus (2)

• The Efficiency Limit of CH3NH3PbI3 Perovskite Solar Cells
• Micro-engineered CH${}_3$NH${}_3$PbI${}_3$ nanowire/graphene phototransistor for low intensity light detection at room temperature

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• Three-dimensionally Enlarged Photoelectrodes by a Protogenetic Inclusion of Vertically Aligned Carbon Nanotubes into CH3NH3PbBr3 Single Crystals
• Synthesis and Characterizations of CH3NH3PbI3:ZnS Microrods for Optoelectronic Applications
• Influence of the organic cation disorder on photoconductivity in ethylenediammonium lead iodide, NH3CH2CH2NH3PbI4
• Morphology and Photoluminescence of CH3NH3PbI3 Deposits on Nonplanar, Strongly Curved Substrates