Monolithic radio frequency SiN x self-rolled-up nanomembrane interdigital capacitor modeling and fabrication

Lei Sang, Hao Zhou, Zhendong Yang, Mark D. Kraman, Haojie Zhao, Julian A. Michaels, Dane J. Sievers, Jose E. Schutt-Aine, Xiuling Li, Wen Huang

Research output: Contribution to journalArticlepeer-review


Monolithic capacitors operating at radio frequencies (RF) serve as critical components in integrated circuits for wireless communication. Design and fabrication innovations for high capacitance density RF capacitors are highly desired for the miniaturization of RFIC chips. However, practical and simple solutions are limited by existing capabilities in three-dimensional (3D) structure construction and the effective configuration of electrodes. We report a unique route to achieve unprecedentedly high capacitance density at a high operating frequency through a capacitor configuration of 3D coil interdigital electrodes using planar semiconductor processing compatible materials and fabrication methods. A systematic mechanical-electrical design principle is demonstrated, and fabricated devices show a maximum 21.5 pF capacitance, which is 17.2× larger after rolling up. The corresponding capacitance density is as large as 371 pF mm-2, with resonant frequency of 1.5 GHz. The performance could be improved significantly by simply rolling up more turns with minimal change to the area footprint.

Original languageEnglish (US)
Article number364001
Issue number36
StatePublished - Jun 17 2019
Externally publishedYes


  • interdigital capacitor
  • radio frequency
  • self-rolled-up nanomembrane

ASJC Scopus subject areas

  • Bioengineering
  • General Chemistry
  • General Materials Science
  • Mechanics of Materials
  • Mechanical Engineering
  • Electrical and Electronic Engineering


Dive into the research topics of 'Monolithic radio frequency SiN x self-rolled-up nanomembrane interdigital capacitor modeling and fabrication'. Together they form a unique fingerprint.

Cite this