材料科学
范德瓦尔斯力
半导体
光电子学
超短脉冲
相(物质)
Crystal(编程语言)
压电
带隙
堆积
凝聚态物理
铟
纳米技术
光学
激光器
物理
核磁共振
量子力学
分子
计算机科学
复合材料
程序设计语言
作者
Zeyuan Sun,Yu Zhang,Jimin Qian,Ruixi Qiao,Xian Li,Zerui Wang,Changlin Zheng,Kaihui Liu,Ting Cao,Wei‐Tao Liu,Shiwei Wu
标识
DOI:10.1002/adom.202201183
摘要
Abstract Indium selenide (InSe), a layered semiconductor with direct band gap and high carrier mobility, holds promising applications in bendable electronics and ultrafast optoelectronics. Yet its crystal structure exhibits polytypism with four different stacking orders (γ‐, ε‐, β‐ and δ‐phases), arising from the weak van der Waals interlayer coupling. These phases are nearly‐degenerate in energy but are predicted to have contrasting electronic structures for versatile applications. It remains highly challenging to distinguish between these polytypes due to the lack of noninvasive tools that are sensitive enough to the interlayer structural variations. Here, the unambiguous discrimination of different InSe polytypes using symmetry‐sensitive oblique incident optical second harmonic generation (SHG) is demonstrated. Surprisingly, the ε‐phase is found to be dominant, although the samples from two popular commercial vendors (2D Semiconductors and Six Carbon Technology) are claimed to be the γ‐phase. These results would help promoting the precise application of InSe crystal for piezoelectric transducer and strain sensing, as well as showing the oblique incident SHG to be a powerful structural analytical tool for van der Waals layered materials.
科研通智能强力驱动
Strongly Powered by AbleSci AI