arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2008.00443cond-mat.mtrl-scicond-mat.mes-hall
收藏

单原子层同位素改性氮化硼的优异导热性能

Outstanding Thermal Conductivity of Single Atomic Layer Isotope-Modified Boron Nitride

Qiran Cai, Declan Scullion, Wei Gan, Alexey Falin, Pavel Cizek, Song Liu, James H. Edgar, Rong Liu, Bruce C. C. Cowie, Elton J. G. Santos, Lu Hua Li

摘要:

具有高热导率(k)的材料对于解决高度集成和小型化的现代设备中的废热耗散的挑战是有价值的。在此,我们报告的第一个合成原子薄的同位素纯六方氮化硼(BN)和它的所有半导体和电绝缘体中最高的k之一。富含11B的单原子层(1 L)BN在室温下具有高达1009 W/mK的k。我们发现,同位素工程主要抑制BN中的面外光学(ZO)声子散射,从而减少ZO与横向声学(TA)和纵向声学(LA)声子之间的声光散射。另一方面,减少厚度到单个原子层减少了层间相互作用,因此减少了面外声学(ZA)声子的Umklapp散射,尽管这种厚度引起的k增强不如天然存在的BN那样显著。具有许多独特性质的原子级薄的单一同位素BN在范德华(vdW)器件和未来柔性电子器件的热管理方面很有前途。原子级薄BN的同位素工程也可能在2D材料中开辟其他有吸引力的应用和机会。

英文摘要:

Materials with high thermal conductivities (k) is valuable to solve the challenge of waste heat dissipation in highly integrated and miniaturized modern devices. Herein, we report the first synthesis of atomically thin isotopically pure hexagonal boron nitride (BN) and its one of the highest k among all semiconductors and electric insulators. Single atomic layer (1L) BN enriched with 11B has a k up to 1009 W/mK at room temperature. We find that the isotope engineering mainly suppresses the out-of-plane optical (ZO) phonon scatterings in BN, which subsequently reduces acoustic-optical scatterings between ZO and transverse acoustic (TA) and longitudinal acoustic (LA) phonons. On the other hand, reducing the thickness to single atomic layer diminishes the interlayer interactions and hence Umklapp scatterings of the out-of-plane acoustic (ZA) phonons, though this thickness-induced k enhancement is not as dramatic as that in naturally occurring BN. With many of its unique properties, atomically thin monoisotopic BN is promising on heat management in van der Waals (vdW) devices and future flexible electronics. The isotope engineering of atomically thin BN may also open up other appealing applications and opportunities in 2D materials yet to be explored.

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。

↑