High-quality single crystals have low defect densities and excellent photophysical properties, yet thin films are the most sought after material geometry for optoelectronic devices. Perovskite single-crystal thin films (SCTFs) would be highly desirable for high performance devices, but their growth remains challenging, particularly for inorganic halide perovskites. We have also reported a facile vapor-phase epitaxial growth of cesium lead bromide perovskite (CsPbBr3) continuous SCTFs with controllable micrometer thickness, as well as nanoplate arrays, on traditional oxide perovskite SrTiO3 (100) substrates (Figure 4).7 Heteroepitaxial single-crystal growth is enabled by the serendipitous incommensurate lattice match between these two perovskites and overcoming the limitation of island forming Volmer-Weber crystal growth is critical for growing large-area continuous thin films. Our work suggests a general approach using oxide perovskites as substrates for heteroepitaxial growth of halide perovskites. The high-quality halide perovskite SCTFs epitaxially integrated with multifunctional oxide perovskites could open up opportunities for a variety of high-performance optoelectronics devices.
Figure 9. (a) Crystal structure of 2D perovskite PEA2PbBr4. (b) Schematic illustrations of the solvent vapor annealing technique. (c) EQE for the LED devices fabricated with thin film and nanoplates. (d) EL spectra of a typical LED device in comparison with the PL spectra. Inset is cross-sectional SEM image of the device.
Synthesis Of Perovskites - TAXI OFFROAD
Metal-halide perovskites have been hailed as remarkable materials for photovoltaic devices and, recently, their star has also been on the rise in optoelectronics and photonics. In particular, the optical properties of a metal-halide perovskite can be widely manipulated once its bulk structure has been reduced to a low-dimensional structure, allowing multiple functionalities of light generation, emission, transmission, and detection to be realized in one material. In this paper, we highlight the recent advances in the synthesis of low-dimensional metal-halide perovskites and their unique properties as well as their novel optoelectronic and photonic applications. It is anticipated that this review can serve as an overview and evaluation of state-of-the-art synthesis techniques as well as nanoscale optoelectronics and photonics based on low-dimensional perovskite nanocrystals.
Perovskite Nanomaterials – Synthesis, Characterization, and ..
Figure 1. (a) The schematic crystal structure of lead halide perovskites ABX3. (b) Illustrations of the two growth mechanisms of crystalline perovskite nanostructures. (c) SEM and TEM images of some example perovskite NWs.
Synthesis, Single Crystal Growth, and Properties of …
Figure 4. Vapor-phase growth of CsPbBr3 nanoplate arrays and continuous thin films on traditional oxide perovskite SrTiO3 (100) substrates, together with schematic illustration of the incommensurate lattice match between CsPbBr3 (100) and STO (100) crystallographic planes.
Two-Dimensional CH3NH3PbI3 Perovskite: Synthesis …
Metastable structural polymorphs can have superior properties and applications than their thermodynamically stable phases but rational synthesis of metastable phases is a challenge. For example, due to the ionic mismatch as reflected by the Goldsmidt structural tolerance factor, the perovskite structures of FAPbI3 and CsPbI3 that hold great promises in solar and light-emitting applications are metastable at room temperature (see Figure 5 for an example of different polymorphs of CsPbI3 and their phase transitions).8,9 The spontaneous phase transitions not only rule out the possible use of these metastable perovskite phases in practical applications, but also prevents the study of the intrinsic photophysical properties.