期刊
APPLIED SURFACE SCIENCE
卷 470, 期 -, 页码 143-149出版社
ELSEVIER
DOI: 10.1016/j.apsusc.2018.11.076
关键词
Lead iodide; Two-dimensional semiconductor; Optical property; Electronic structure; Excitonic effects
类别
资金
- NSF of China [11274095, 10947001]
- Henan Educational Committee [17B140002]
Exciton states have obvious effects on optical properties of two-dimensional (2D) materials. Here, we investigate excitonic effects on electronic and optical properties of PbI2 by using G(0)W(0 )+ Bethe-Salpeter equation method, considering the layer number and strain effect. These studies show that exciton states obviously modify and dominate the optical absorption of 2D PbI2 nanosheets. Also, with the increasing number of layers, the intensity of main absorption peak increases and the exciton binding energy decreases. Meanwhile, the tensile strain can induce the threshold energy of optical spectra shift down the low energy, and exciton binding energy has a maximum at the strain of 3%. Therefore, our results indicate that the 2D PbI2 nanomaterials have excellent ultraviolet absorption and corresponding potential for the application of optoelectronic devices.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据