Abstract
We report fabrication of large-scale homogeneous crystallization of CH3NH3PbBr3 (MAPbBr3) in the patterned substrate by a two-dimensional (2D) grating. This achieves high-quality optotelectronic structures on local sites in the micron scales and a homogeneous thin-film device in a centimeter scale, proposing a convenient technique to overcome the challenge for producing large-area thin-film devices with high quality by spin-coating. Through matching the concentration of the MAPbBr3/DMF solutions with the periods of the patterning structures, we found an optimized size of the patterning channels for a specified solution concentration (e.g., channel width of 5 μm for a concentration of 0.14 mg/mL). Such a design is also an excellent scheme for random lasing, since the crystalline periodic networks of MAPbBr3 grids are multi-crystalline constructions, and supply strong light-scattering interfaces. Using the random lasing performance, we can also justify the crystallization qualities and reveal the responsible mechanisms. This is important for the design of large-scale optoelectronic devices based on thin-film hybrid halide perovskites.
Highlights
Organic-inorganic hybrid halide perovskites are a group of promising semiconductor materials for high-efficiency optoelectronic devices [1,2,3,4,5,6]
Single- or multi-crystals have been synthesized in large scales at high quality [18,19,20,21,22] and have been applied for various purposes, thin-film devices [23,24,25,26] are more attractive in the construction of devices that are integratable into micro- or nano-scale systems
We have recently reported controllable crystallization of the hybrid halide perovskites into grating lines with continuous distribution over a large length scale [27], which provides an effective approach to overcome the above-mentioned challenge for producing high-quality MAPbBr3 crystal stripe gratings with controllable performance
Summary
Organic-inorganic hybrid halide perovskites are a group of promising semiconductor materials for high-efficiency optoelectronic devices [1,2,3,4,5,6]. Patterning the substrate with designed micro- or nano-structures and optimized microscopic dimensions may modify its surface-energy properties, and control the molecular crystallization process by dividing the large-area surface into periodic/nonperiodic localized sites. This is an ideal strategy to achieve large-area thin films with high qualities precisely controllable on each local site. Such a strategy applies to hybrid halide perovskites [27] and to any other organic/inorganic semiconductors [28,29] or even biomolecules [30] with strong aggregation performance. With a homogeneous area in the scale of cm and locally high-quality crystalline structures in sizes of microns
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