期刊
MATERIALS TODAY PHYSICS
卷 34, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.mtphys.2023.101083
关键词
van der Waals crystalRhI3; High pressure; Enhanced photoelectric property
This study demonstrates the extremely weak interlayer coupling and high tunability of layered RhI3 crystals. A pressure-driven phase transition and an ultra-broad tunability of bandgap narrowing were observed. These findings provide new opportunities for exploring and understanding layered van der Waals halides.
The realization of high tunability in layered van der Waals halides may create new interesting optical and op-toelectronic properties. These soft materials are particularly sensitive to external stress or pressure, suggesting a feasible route to pinpoint their structure with extraordinary behavior. However, a very sensitive pressure response usually lead to a detrimental phase transition and/or lattice distortion, making the approach of ma-terials manipulation in a continuous manner remain challenging. Here, the extremely weak interlayer coupling and high tunability of layered RhI3 crystals are observed. A pressure-driven phase transition occurs at a moderate pressure of 5 GPa, interlinking to a change of layer stack mode. Strikingly, such a phase transition does not affect the tendency of quasi-linear bandgap narrowing, and a metallization with an ultra-broad tunability of 1.3 eV redshift is observed at higher pressures. Moreover, the carrier concentration of RhI3 increases by 4 orders of magnitude at 30 GPa, and the photocurrent enhances by 5 orders of magnitude at 7.8 GPa. These findings create new opportunities for exploring, tuning, and understanding the van der Waals halides by harnessing their un-usual feature of a layered structure, which is promising for future devices based on materials-by-design that are atomically thin.
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