范德华力对苯在硅上吸附结构的影响
Influence of van der Waals forces on the adsorption structure of benzene on silicon
摘要:
采用密度泛函理论研究了苯在Si(001)-(2x 1)表面的两种不同吸附构型:紧桥结构和蝶形结构.几个交换和相关泛函,包括最近开发的vdW-DF功能,占范德华力的效果。与PBE,revPBE和其他GGA泛函相比,vdW-DF泛函发现,对于大多数覆盖率,蝶形结构的吸附能大于紧桥结构的吸附能。
英文摘要:
Two different adsorption configurations of benzene on the Si(001)-(2x1) surface, the tight-bridge and butterfly structures, were studied using density functional theory. Several exchange and correlation functionals were used, including the recently developed vdW-DF functional, which accounts for the effect of van der Waals forces. In contrast to the PBE, revPBE and other GGA functionals, the vdW-DF functional finds that, for most coverages, the adsorption energy of the butterfly structure is greater than that of the tight-bridge structure.
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