Improved Crystallization Quality of FAPbBr₃ Single Crystals by a Seeded Solution Method

Abstract

Solution-grown hybrid perovskite, FAPbBr3, has attracted great attentions recently due to its inspiring optoelectronic properties and low-cost preparation method. However, challenges of solution growth for FAPbBr3 bulk crystals remain yet, such as uncontrollable crystalline morphologies, irregular shapes, and limited crystal sizes, which are attributed to the dense crystallization nucleus. In this work, we investigate the effects of growth conditions and seed behaviors on the crystallization quality and the yield of FAPbBr3 single crystals. First, the spontaneous nucleation is tailored by optimizing the precursor concentration and heating rate. Furthermore, the seeded crystals are introduced to solve the issues related to the morphology and the yield of single crystals. Based on the above-mentioned investigations, an optimized growth method, a seeded solution method, under a heating rate of 0.1 °C/h is proposed, and centimeter-scale FAPbBr3 single crystals with a very narrow FWHM of high-resolution X-ray diffraction rocking curves and a high yield of ∼100% of single crystals are obtained. The resulting FAPbBr3 single crystal exhibits a bulk resistivity of 3.42 × 109 Ω·cm and a superior I ON/I OFF ratio over 104 under 405 nm light at a bias of 10 V. Finally, the pulse height spectra with an energy resolution of ∼21.4% are also achieved based on an AZO/FAPbBr3/Au detector, illuminated using an uncollimated 241Am@5.49 MeV α-particle source at room temperature. This modified seeded solution method shows great potential in preparing high-quality and high-yield perovskite single crystals.

Near-Net-Shaped Growth of Inch-Sized MAPbBr3 Bulk Crystal by the Space-Confined Seeded Solution Method

“…There are many theorems 29 for predicating the native morphologies, but the common idea is that the surfaces of the crystals should be composed by those with a smaller surface energy and therefore have a lower perpendicular growth rate. 30 Therefore, the resulting crystal morphology is determined by the relative growth rates of the crystal facets. Finally, the cubic shaped MPB crystals with six {100} facets formed due to the slowest growth rate along 12 these directions.…”

Nucleation-controlled growth of high-quality CsPbBr3 single crystals for ultrasensitive weak-light photodetectors

“…Nevertheless, a high concentration precursor solution generally leads to a high nucleation rate in the nucleation stage, and tends to produce more crystal nuclei with small size. 8,25 As shown in Fig. 1(e) and (f), if these crystals continue to grow, they will attach with adjacent crystals and merge into irregular blocks, which is not conducive to the growth of large-size crystals.…”

“…Halide perovskite single crystals (SCs) have attracted enormous attention for high-performance photoelectronic devices, owing to their large light absorption coefficient, tunable bandgap, high carrier mobility, long carrier diffusion length, and high defect tolerance. [1][2][3][4][5][6][7][8] Compared with organic-inorganic hybrid perovskite SCs, all-inorganic perovskite CsPbBr 3 SCs principally possess better environmental stability due to the replacement of the volatized organic cation by inorganic Cs + , which endows CsPbBr 3 SCs with a broad application prospect in the photoelectronic field. [9][10][11][12][13] To date, the vertical Bridgman method and solution growth methods including inverse temperature crystallization (ITC) and anti-solvent vapor-assisted crystallization (AVC) have been the two most commonly used growth methods for CsPbBr 3 SCs.…”

“…Halide perovskite single crystals (SCs) have attracted enormous attention for high-performance photoelectronic devices, owing to their large light absorption coefficient, tunable bandgap, high carrier mobility, long carrier diffusion length, and high defect tolerance. 1–8 Compared with organic–inorganic hybrid perovskite SCs, all-inorganic perovskite CsPbBr 3 SCs principally possess better environmental stability due to the replacement of the volatized organic cation by inorganic Cs + , which endows CsPbBr 3 SCs with a broad application prospect in the photoelectronic field. 9–13…”

Improved performance of UV-blue dual-band Bi2O3/TiO2 photodetectors and application of visible light communication with UV light encryption

“…The device showed photoresponse characteristics in the visible to NIR range with a maximum responsivity and detectivity of 410 mA W −1 and 2.72 × 10 12 Jones, respectively. 24 Through two-step chemical vapour deposition (CVD), WSe 2 /Bi 2 Te 3 p–n heterojunctions exhibited a high responsivity of 20.5 A W −1 and 27 mA W −1 and a fast rise time ( τ rise ) and decay time ( τ decay ) without applied bias at 633 and 1550 nm after improving the interfacial contacts. 25 CsPbBr 3 @ZnO p–n junction PDs were constructed by directly growing micron-sized chalcogenide single crystals on ZnO nanowires using a liquid phase method.…”