Assessing the Structural Diversity of Form II Red Phosphorus via Stepwise Crystal Structure Search.

Recently, the long less-known Form II red phosphorus (RP) (viz. Type II RP) was ascertained by the state-of-the-art 3-dimensional electron diffraction technique with a triclinic lattice, completely distinct from other known elemental phosphorus and leaving atomic coordinates not determined. The cell composed of ∼250 atoms might exceed the capacity of current readily available crystal structure search packages, which have been widely applied to systems with several tens of atoms.

Narrow-Bandgap Tellurium-Based Chiral Hybrid Perovskite Single Crystals with Rashba-Dresselhaus Effect and Piezoelectricity.

Chiral hybrid perovskites have aroused great interest due to their unique versatile properties. However, designing chiral perovskites with narrow bandgaps is challenging, with their electronic properties such as the Rashba-Dresselhaus effect and piezoelectricity remaining unclear. Herein, single crystals of zero-dimensional (0D) tellurium-based chiral hybrid perovskite, (-/-α-PEA)TeI and (-/-α-PEA)TeBr (PEA = phenylethylammonium), with sizes of over 5 mm are grown by seed-crystal-assisted solution-temperature-lowering.

Polarization conversion in bottom-up grown quasi-1D fibrous red phosphorus flakes.

Fibrous red phosphorus (RP) has triggered growing attention as an emerging quasi-one-dimensional (quasi-1D) van der Waals crystal recently. Unfortunately, it is difficult to achieve substrate growth of high-quality fibrous RP flakes due to their inherent quasi-1D structure, which impedes their fundamental property exploration and device integration. Herein, we demonstrate a bottom-up approach for the growth of fibrous RP flakes with (001)-preferred orientation via a chemical vapor transport (CVT) reaction in the P/Sn/I system.

Centimeter-Sized Piezoelectric Single Crystal of Chiral Bismuth-Based Hybrid Halide with Superior Electrostrictive Coefficient.

The lead-free hybrid perovskite piezoelectrics possess advantages of easy processing, light weight, and low-toxicity over inorganic ceramics. However, the lack of understanding in structure-property relationships hinders exploration of new molecular piezoelectric crystals with excellent performances. Herein, by introducing chiral α-phenylethylammonium (α-PEA ) cations into bismuth-based hybrid halides, centimeter-sized (R-α-PEA) Bi I and (S-α-PEA) Bi I single crystals with a superior piezoelectric voltage coefficient g of 309 mV m N , are obtained.

Ternary Hybrid Perovskite Solid Solution Single Crystals: Growth, Composition Determination and Phase Stability in Highly Moist Atmosphere.

Ternary hybrid perovskite solid solutions have shown superior optoelectronic properties and better stability than their ABX simple perovskite counterparts under ambient conditions. However, crystal growth and identification of the accurate composition of these complex crystalline compounds remain challenging, and their stability under extreme conditions such as in highly moist atmosphere is unknown. Herein, large-size (up to 2 cm) single crystals of ternary perovskite 0.