Controlled growth of CH3NH3PbI3 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 CH3NH3PbI3 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.

Hybrid Organic–Inorganic Perovskite Photodetectors

“…Alternatively, perovskite single crystals are expected to achieve impressive photosensing performances due to their absence of grain boundaries, low trap densities, and large carrier mobilities . Apart from polycrystalline film and single crystal, low‐dimensional perovskite nanostructures including 1D nanowire and 2D nanosheet have been successfully synthesized and received increasing research attention, primarily for their fascinating optical and electronic properties resulting from the quantum‐size effects . In this section, we will focus on the introduction of recent results on various perovskite structures for photodetectors and their photoresponse performances.…”

Photodetectors Based on Organic–Inorganic Hybrid Lead Halide Perovskites

“…Since R is closely related to the incident light intensity (Equation (4) and Figure 2g), superhigh R values can thus be obtained when irradiated by extremely low light powers 56, 69, 70, 71, 72, 75, 85, 86, 87, 88, 89, 90. Other differences in testing conditions such as the bias voltages and the incident wavelengths will also affect the electrical performance of the devices.…”

Bandgap tunable Csx(CH3NH3)1−xPbI3perovskite nanowires by aqueous solution synthesis for optoelectronic devices

“…Hybrid perovskites have attracted great interest due to their tunable bandgaps and superior energy conversion properties. The bangap tuning were generally implemented by changing the composition by halogen anion [10][11][12][13][14] or cation [15][16][17] Nowadays, the synthesis methods of perovskite NWs were ascribed to solvent evaporation assisted self-assembly method [19][20][21][22][23][24] . And most reports utilized organic polar solvent such as N, N-dimethyformamide (DMF), dimethyl sulfoxide(DMSO) in solution method.…”