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Untangling photofaradaic and photocapacitive effects in organic optoelectronic stimulation devices

Ðerek, Vedran; Rand, David; Migliaccio, Ludovico; Hanein, Yael; Głowacki, Eric Daniel (2020) Untangling photofaradaic and photocapacitive effects in organic optoelectronic stimulation devices. Frontiers in bioengineering and biotechnology, 8 . ISSN 2296-4185

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Light, as a versatile and non-invasive means to elicit a physiological response, offers solutions to problems in basic research as well as in biomedical technologies. The complexity and limitations of optogenetic methods motivate research and development of optoelectronic alternatives. A recently growing subset of approaches relies on organic semiconductors as the active light absorber. Organic semiconductors stand out due to their high optical absorbance coefficients, mechanical flexibility, ability to operate in a wet environment, and potential biocompatibility. They could enable ultrathin and minimally invasive form factors not accessible with traditional inorganic materials. Organic semiconductors, upon photoexcitation in an aqueous medium, can transduce light into (1) photothermal heating, (2) photochemical/photocatalytic redox reactions, (3) photocapacitive charging of electrolytic double layers, and (4) photofaradaic reactions. In realistic conditions, different effects may coexist, and understanding their role in observed physiological phenomena is an area of critical interest. This article serves to evaluate the emerging picture of photofaradaic vs. photocapacitive effects in the context of our group’s research efforts and that of others over the past few years. We present simple experiments which can be used to benchmark organic optoelectronic stimulation devices.

Item Type: Article
Uncontrolled Keywords: bioelectronics ; neurostimulation ; organic electronics ; photoelectrochemistry ; photostimulation
Subjects: NATURAL SCIENCES > Physics
INTERDISCIPLINARY AREAS OF KNOWLEDGE > Biotechnology in Biomedicine (natural science, biomedicine and healthcare, bioethics area
Divisions: Center of Excellence for Advanced Materials and Sensing Devices
Project titleProject leaderProject codeProject type
Mikro i nano-strukture za 3D opto-bioelektronikuĐerek, VedranUIP-2019-04-1753HRZZ
Depositing User: Vedran Đerek
Date Deposited: 02 Feb 2022 14:53
DOI: 10.3389/fbioe.2020.00284

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