Wei Zhang, Ying Xu, Zailan Zhang, Xuan Zhang, Ruixi Qiao, Shuiyan Cao, Zhesheng Chen, Yinlong Zhu, Xiaoming Zhao, Zhuhua Zhang, Wanlin Guo

Advanced Optical Materials  ，2025，e02669

Abstract: Black phosphorus (BP) nanoribbons, featuring a width-tunable direct bandgap, enhanced quantum confinement, and anisotropic edge-dependent properties, emerge as ideal candidates for next-generation electronic and photonic applications. However, the synthesis of high-quality  one dimensional (1D) BP structures remains a considerable challenge. Here, a silver-assisted chemical vapor transport is reported for the fabrication of single-crystalline BP microribbons with preferential zigzag edges. The incorporation of silver not only reduces the nucleation energy of BP domains but also suppresses armchair-directional growth, thereby promoting anisotropic microribbon formation. The obtained BP microribbons exhibit high crystallinity, with widths ranging from ≈2 to 80 µm, lengths extending to 1 cm, and aspect ratios exceeding 1,000. Photodetectors based on individual microribbons demonstrate broadband photo-response spanning visible to near-infrared wavelengths, achieving a responsivity of up to 35 and 12 mA W−1 at 532 and 1064 nm, respectively. This work provides a practical route for fabricating quasi-1D BP nanostructures suitable for integration into functional devices.

Link: https://advanced.onlinelibrary.wiley.com/doi/full/10.1002/adom.202502669