journal article·2024-07Open access

Cleanroom‐Free Direct Laser Micropatterning of Polymers for Organic Electrochemical Transistors in Logic Circuits and Glucose Biosensors

Alessandro Enrico, Sebastian Buchmann, Fabio De Ferrari, Yunfan Lin, Yazhou Wang, Wan Yue, Gustaf Mårtensson, Göran Stemme, Mahiar Max Hamedi, Frank Niklaus, Anna Herland, Erica Zeglio

Advanced Science· Volume 11· Issue 27

Abstract

Abstract Organic electrochemical transistors (OECTs) are promising devices for bioelectronics, such as biosensors. However, current cleanroom‐based microfabrication of OECTs hinders fast prototyping and widespread adoption of this technology for low‐volume, low‐cost applications. To address this limitation, a versatile and scalable approach for ultrafast laser microfabrication of OECTs is herein reported, where a femtosecond laser to pattern insulating polymers (such as parylene C or polyimide) is first used, exposing the underlying metal electrodes serving as transistor terminals (source, drain, or gate). After the first patterning step, conducting polymers, such as poly(3,4‐ethylenedioxythiophene):poly(styrene sulfonate) (PEDOT:PSS), or semiconducting polymers, are spin‐coated on the device surface. Another femtosecond laser patterning step subsequently defines the active polymer area contributing to the OECT performance by disconnecting the channel and gate from the surrounding spin‐coated film. The effective OECT width can be defined with high resolution (down to 2 µm) in less than a second of exposure. Micropatterning the OECT channel area significantly improved the transistor switching performance in the case of PEDOT:PSS‐based transistors, speeding up the devices by two orders of magnitude. The utility of this OECT manufacturing approach is demonstrated by fabricating complementary logic (inverters) and glucose biosensors, thereby showing its potential to accelerate OECT research.
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Research context

OpenAlex topics: Conducting polymers and applications · Advanced Sensor and Energy Harvesting Materials · Neuroscience and Neural Engineering

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Department of Micro and Nanosystems KTH Royal Institute of Technology Malvinas väg 10 Stockholm 100 44 Sweden

Synthetic Physiology lab Department of Civil Engineering and Architecture University of Pavia Via Ferrata 3 Pavia 27100 Italy

Division of Nanobiotechnology SciLifeLab Department of Protein Science KTH Royal Institute of Technology Tomtebodavägen 23a Solna 171 65 Sweden

AIMES – Center for the Advancement of Integrated Medical and Engineering Sciences Department of Neuroscience Karolinska Institute Stockholm 17177 Sweden

Guangzhou Key Laboratory of Flexible Electronic Materials and Wearable Devices School of Materials Science and Engineering Sun Yat‐sen University Guangzhou 510275 P. R. China

Key Laboratory for Polymeric Composite and Functional Materials of Ministry of Education School of Materials Science and Engineering Sun Yat‐sen University Guangzhou 510275 P. R. China

Mycronic AB Nytorpsvägen 9 Täby 183 53 Sweden

Department of Fibre and Polymer Technology School of Engineering Sciences in Chemistry Biotechnology and Health KTH Royal Institute of Technology Teknikringen 56 Stockholm 10044 Sweden

Wallenberg Initiative Materials Science for Sustainability Department of Materials and Environmental Chemistry Stockholm University Stockholm 114 18 Sweden

Funding

Fundamental Research Funds for the Central Universities · Sun Yat-sen University · H2020 Marie Skłodowska-Curie Actions · Vetenskapsrådet · Knut och Alice Wallenbergs Stiftelse · Karolinska Institutet · Kungliga Tekniska Högskolan

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