Zero-dimensional (0D) halides perovskites, in which anionic metal-halide octahedra (MX6)4− are separated by organic or inorganic countercations, have recently shown promise as excellent luminescent materials.

We report the synthesis and characterization of (Ph 4 P) 2 SbCl 5 , a novel ionically bonded organic metal halide hybrid with a zero-dimensional (0D) structure at the molecular level. By cocrystallization of tetraphenylphosphonium (Ph 4 P + ) and antimony (Sb 3+ ) chloride salts, (Ph 4 P) 2 SbCl 5 bulk single crystals can be prepared in high yield, which exhibit a highly efficient broadband red emission peaked at 648 nm with a photoluminescence quantum efficiency (PLQE) of around 87%. Density functional theory (DFT) calculations reveal the origin of emission as phosphorescence from the excitons localized at SbCl 5 2− with strong excited-state structural distortion. Interestingly, (Ph 4 P) 2 SbCl 5 bulk crystals with a PLQE of around 100% can be prepared via a rapid crystal growth process within minutes, followed by a spontaneous structural transformation. It was found that the rapid growth process yielded a yellow emitting kinetically favored metastable product containing solvent molecules, which turned into the red emitting thermodynamically stable product slowly at room temperature or quickly upon thermal treatment.

It was expected that the properties of intrinsic point defects would be simple in the binary semiconductor Sb2Se3. However, we show using first-principles calculations that the intrinsic defects in this quasi-one-dimensional (Q1D) semiconductor are unexpectedly complicated and different from those in conventional photovoltaic semiconductors such as CdTe or GaAs. First, the same type of defects located on non-equivalent atomic sites can have very different properties due to the low symmetry of the Q1D structure, which makes the properties of point defects complicated, even though there are only a few point defects. Second, uncommon defects such as the cation-replace-anion antisite SbSe, anion-replace-cation antisite SeSb, and even two-anion-replace-one-cation antisite 2SeSb, which are difficult to form in CdTe and GaAs, can have high concentrations and even be dominant in Sb2Se3 due to the weak van der Waals interactions and the large void space between different [Sb4Se6] n atomic chains of the Q1D structure. These defects produce a series of acceptor and donor levels in the band gap and make Sb2Se3 p-type under the Se-rich condition but n-type under the Se-poor condition. Five deep-level recombination-center defects are identified, and their formation is difficult to suppress, imposing a serious limit to the development of high-efficiency Sb2Se3 solar cells. Our study demonstrates that the defects can be complicated and unconventional in the binary compound semiconductors with low symmetry and Q1D structures, which can be classified as chemically binary while structurally multinary.