Open AccessMicropyramid structured photo capacitive interfaces
Author(s) -
Marta Nikić,
Alexandar Opancar,
Florian Hartmann,
Ludovico Migliaccio,
Marie Jakešová,
Eric Daniel Głowacki,
Vedran Đerek
Publication year - 2022
Publication title -
nanotechnology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.926
H-Index - 203
eISSN - 1361-6528
pISSN - 0957-4484
DOI - 10.1088/1361-6528/ac5927
Subject(s) - materials science , substrate (aquarium) , capacitive sensing , optoelectronics , parylene , electrode , conformal coating , electronics , nanotechnology , silicon , computer science , coating , electrical engineering , oceanography , polymer , chemistry , engineering , composite material , geology , operating system
Optically driven electronic neuromodulation devices are a novel tool in basic research and offer new prospects in medical therapeutic applications. Optimal operation of such devices requires efficient light capture and charge generation, effective electrical communication across the device’s bioelectronic interface, conformal adhesion to the target tissue, and mechanical stability of the device during the lifetime of the implant—all of which can be tuned by spatial structuring of the device. We demonstrate a 3D structured opto-bioelectronic device—an organic electrolytic photocapacitor spatially designed by depositing the active device layers on an inverted micropyramid-shaped substrate. Ultrathin, transparent, and flexible micropyramid-shaped foil was fabricated by chemical vapour deposition of parylene C on silicon moulds containing arrays of inverted micropyramids, followed by a peel-off procedure. The capacitive current delivered by the devices showed a strong dependency on the underlying spatial structure. The device performance was evaluated by numerical modelling. We propose that the developed numerical model can be used as a basis for the design of future functional 3D design of opto-bioelectronic devices and electrodes.