CAS Key Laboratory of Standardization and Measurement for Nanotechnology, CAS Center for Excellence in Nanoscience, National Center for Nanoscience and Technology, Beijing 100190, People's Republic of China.
Nanotechnology. 2016 Nov 4;27(44):445705. doi: 10.1088/0957-4484/27/44/445705. Epub 2016 Sep 27.
2D transition metal dichalcogenide (TMD) alloys with tunable band gaps have recently gained wide interest due to their potential applications in future nanoelectronics and optoelectronics. Here, we report the temperature-dependent photoluminescence (PL) and Raman spectra of Mo1-x W x S2 monolayers with W composition x = 0, 0.29, 0.53, 0.66 and 1 in the temperature range 93-493 K. We observed a linear temperature dependence of PL emission energy and Raman frequency. The PL intensity is enhanced at high temperature (>393 K). The temperature coefficients are negative for both PL and Raman bands, which may result from anharmonicity, thermal expansion and composition disorder.
二维过渡金属二硫属化物（TMD）合金具有可调带隙，由于它们在未来纳米电子学和光电子学中的潜在应用而引起了广泛关注。在这里，我们报告了在温度范围为 93-493 K 下，组成比 x = 0、0.29、0.53、0.66 和 1 的 Mo1-x WxS2 单层的温度依赖性光致发光（PL）和拉曼光谱。我们观察到 PL 发射能量和 Raman 频率的线性温度依赖性。在高温（>393 K）下，PL 强度增强。PL 和 Raman 带的温度系数均为负，这可能是由于非谐性、热膨胀和组成无序所致。
