Halide-Mediated Low-Temperature van der Waals-Templated Synthesis of Single-Crystalline BiSCl Nanowires

BiSCl has been reported as a promising candidate for photoelectric materials in solar cells and photoelectric detectors. Herein, we report a direct low-temperature templated scalable transformation from Bi₂S₃ to single-crystalline BiSCl. Benefiting from the chain-like lattice and abundant van der Waals gaps, we propose that continuous intercalation and diffusion of BiCl₃ facilitate lattice reconstruction and the formation of the BiSCl phase. Ex situ Raman spectroscopy and high-resolution transmission microscopy characterizations indicate that the conversion process is highly controllable and yields high-quality BiSCl nanowire crystals. Notably, the proposed low-temperature synthesis is highly compatible with semiconductor micro/nanofabrication processes. To evaluate its potential, the photoelectric properties of a BiSCl nanowire photoconductive device transformed from a Bi₂S₃ device were investigated, which output a considerably good performance. These results reveal the advantages of the method to synthesize BiSCl nanostructures and its availability in expanding to other materials systems.