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Ultrathin, High Capacitance Capping Layers for Silicon Electronics with Conductive Interconnects in Flexible, Long‐Lived Bioimplants
Author(s) -
Li Jinghua,
Li Rui,
Chiang ChiaHan,
Zhong Yishan,
Shen Haixu,
Song Enming,
Hill Mackenna,
Won Sang Min,
Yu Ki Jun,
Baek Janice Mihyun,
Lee Yujin,
Viventi Jonathan,
Huang Yonggang,
Rogers John A.
Publication year - 2020
Publication title -
advanced materials technologies
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.184
H-Index - 42
ISSN - 2365-709X
DOI - 10.1002/admt.201900800
Subject(s) - materials science , electronics , capacitance , nanotechnology , silicon , electrical conductor , dielectric , biocompatible material , flexible electronics , optoelectronics , electrode , electrical engineering , composite material , biomedical engineering , chemistry , engineering , medicine
Bioimplants that incorporate active electronic components at the tissue interface rely critically on materials that are biocompatible, impermeable to biofluids, and capable of intimate electrical coupling for high‐quality, chronically stable operation in vivo. This study reports a materials strategy that combines silicon nanomembranes, thermally grown layers of SiO 2 and ultrathin capping structures in materials with high dielectric constants as the basis for flexible and implantable electronics with high performance capabilities in electrophysiological mapping. Accelerated soak tests at elevated temperatures and results of theoretical modeling indicate that appropriately designed capping layers can effectively limit biofluid penetration and dramatically extend the lifetimes of the underlying electronic materials when immersed in simulated biofluids. Demonstration of these approaches with actively multiplexed, amplified systems that incorporate more than 100 transistors in thin, flexible platforms highlights the key capabilities and the favorable scaling properties. These results offer an effective encapsulation approach for long‐lived bioelectronic systems with broad potential for applications in biomedical research and clinical practice.