arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2008.12476cond-mat.mtrl-scicond-mat.str-el
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掺硼金刚石(100)和(111)面稳定性的第一性原理计算研究

First-principles calculation study on the stabilities of the (100) and (111) surfaces of boron-doped diamond

Le The Anh, Shota Iizuka, Yasuaki Einaga, Celine Catalan, Yousoo Kim, Yoshitaka Tateyama

摘要:

掺硼金刚石(BDD)在半导体/超导物理和电化学领域中受到了广泛的关注,其中表面结构起着至关重要的作用。本文利用密度泛函理论系统地研究了BDD(100)和(111)裸表面以及H封端表面的可能表面重构。对于优化后的结构,我们进行了STM图像模拟的基础上Tersoff-Hamman方案和计算的投影态密度。我们发现:在BDD(100)上,p(2x 1)重构的能量最低,c(2x2)重构的能量高出0.1673 eV/表面原子,在BDD(111)上,理想(1x 1)重构的能量最低,单链SC-(2x 1)和Pandey链PC-(2x 1)的能量分别高出0.3415 eV/表面原子和0.6576 eV/表面原子。BDD(111)看起来比BDD(100)具有更多的重构,这支持了BDD(111)比BDD(100)更具电化学反应性的想法。此外,我们还研究了硼掺杂对BDD(111)表面态的影响,提出了硼增强BDD(111)石墨化的观点。结果给出了一个洞察的表面稳定性的BDD。

英文摘要:

Boron-doped diamond (BDD) has attracted much attentions in semi-/super-conductor physics and electrochemistry, where the surface structures play crucial roles. Herein, we systematically re-examined the probable surface reconstructions of the bare and H-terminated BDD(100) and (111) surfaces by using density functional theory (DFT). For the optimized structures, we performed STM image simulations based on Tersoff-Hamman scheme and calculations of the projected density of states. We found that: on the BDD(100), the p(2x1) reconstruction has lowest energy and the c(2x2) reconstruction has 0.1673 eV/surface-atom energy higher; On the BDD(111), the ideal (1x1) has lowest energy, the single chain SC-(2x1) and Pandey chain PC-(2x1) have 0.3415 eV/surface-atom and 0.6576 eV/surface-atom higher energy, respectively. The BDD(111) appears to have more reconstructions than the BDD(100) which supports to the idea that the BDD(111) is more electrochemically reactive than the BDD(100). In addition, we study the impact of the Boron dopant on the surface states of the BDD(111) and suggest the Boron-enhanced graphitization on the BDD(111). The results give an insight into the surface stability of the BDD.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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