Ultralow-dielectric-constant amorphous boron nitride

Seokmo Hong, Chang Seok Lee, Min Hyun Lee, Yeongdong Lee, Kyung Yeol Ma, Gwangwoo Kim, Seong In Yoon, Kyuwook Ihm, Ki Jeong Kim, Tae Joo Shin, Sang Won Kim, Eun chae Jeon, Hansol Jeon, Ju Young Kim, Hyung Ik Lee, Zonghoon Lee, Aleandro Antidormi, Stephan Roche, Manish Chhowalla, Hyeon Jin ShinHyeon Suk Shin

Research output: Contribution to journalArticlepeer-review

17 Citations (Scopus)


Decrease in processing speed due to increased resistance and capacitance delay is a major obstacle for the down-scaling of electronics1–3. Minimizing the dimensions of interconnects (metal wires that connect different electronic components on a chip) is crucial for the miniaturization of devices. Interconnects are isolated from each other by non-conducting (dielectric) layers. So far, research has mostly focused on decreasing the resistance of scaled interconnects because integration of dielectrics using low-temperature deposition processes compatible with complementary metal–oxide–semiconductors is technically challenging. Interconnect isolation materials must have low relative dielectric constants (κ values), serve as diffusion barriers against the migration of metal into semiconductors, and be thermally, chemically and mechanically stable. Specifically, the International Roadmap for Devices and Systems recommends4 the development of dielectrics with κ values of less than 2 by 2028. Existing low-κ materials (such as silicon oxide derivatives, organic compounds and aerogels) have κ values greater than 2 and poor thermo-mechanical properties5. Here we report three-nanometre-thick amorphous boron nitride films with ultralow κ values of 1.78 and 1.16 (close to that of air, κ = 1) at operation frequencies of 100 kilohertz and 1 megahertz, respectively. The films are mechanically and electrically robust, with a breakdown strength of 7.3 megavolts per centimetre, which exceeds requirements. Cross-sectional imaging reveals that amorphous boron nitride prevents the diffusion of cobalt atoms into silicon under very harsh conditions, in contrast to reference barriers. Our results demonstrate that amorphous boron nitride has excellent low-κ dielectric characteristics for high-performance electronics.

Original languageEnglish
Pages (from-to)511-514
Number of pages4
Issue number7813
Publication statusPublished - Jun 25 2020

ASJC Scopus subject areas

  • General

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