Seeded growth of boron arsenide single crystals with high thermal conductivity

Fei Tian, Bai Song, Bing Lv, Jingying Sun, Shuyuan Huyan, Qi Wu, Jun Mao, Yizhou Ni, Zhiwei Ding, Samuel Huberman, Te Huan Liu, Gang Chen, Shuo Chen, Ching Wu Chu, Zhifeng Ren

Research output: Contribution to journalArticlepeer-review

31 Citations (Scopus)

Abstract

Materials with high thermal conductivities are crucial to effectively cooling high-power-density electronic and optoelectronic devices. Recently, zinc-blende boron arsenide (BAs) has been predicted to have a very high thermal conductivity of over 2000 W m-1K-1 at room temperature by first-principles calculations, rendering it a close competitor for diamond which holds the highest thermal conductivity among bulk materials. Experimental demonstration, however, has proved extremely challenging, especially in the preparation of large high quality single crystals. Although BAs crystals have been previously grown by chemical vapor transport (CVT), the growth process relies on spontaneous nucleation and results in small crystals with multiple grains and various defects. Here, we report a controllable CVT synthesis of large single BAs crystals (400-600 μm) by using carefully selected tiny BAs single crystals as seeds. We have obtained BAs single crystals with a thermal conductivity of 351 ± 21 W m-1K-1 at room temperature, which is almost twice as conductive as previously reported BAs crystals. Further improvement along this direction is very likely.

Original languageEnglish
Article number031903
JournalApplied Physics Letters
Volume112
Issue number3
DOIs
Publication statusPublished - 2018 Jan 15

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)

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