Flexible Electronics: Integration Processes for Organic and Inorganic Semiconductor-Based Thin-Film Transistors

Vidor, Fábio Fedrizzi; Meyers, Thorsten; Hilleringmann, Ulrich

doi:10.3390/electronics4030480

Cited by 51 publications

(30 citation statements)

References 79 publications

(102 reference statements)

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“…Although more rigid than PET, PEN can confer flexibility due to its intrinsic bendability (Barlow et al 2002;Lechat et al 2006). Both PET and PEN are often used to layer functional components such as metal coatings, metal oxides, conducting polymers, and nanoparticles to form thin structures that can easily conform to biological surfaces (Vidor et al 2015;Zhao et al 2007). The advancement of technologies such as screen printing has also increased their use by making it easier to incorporate fabricated ultrathin microelectrodes and other microcontact devices (Mościcki et al 2017).…”

Section: Flexible Substrate Materialsmentioning

confidence: 99%

The design, fabrication, and applications of flexible biosensing devices

Meng

Obodo

Yadavalli

2019

Biosensors and Bioelectronics

150

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Flexible biosensors form part of a rapidly growing research field that take advantage of a multidisciplinary approach involving materials, fabrication and design strategies to be able to function at biological interfaces that may be soft, intrinsically curvy, irregular, or elastic. Numerous exciting advancements are being proposed and developed each year towards applications in healthcare, fundamental biomedical research, food safety and environmental monitoring. In order to place these developments in perspective, this review is intended to present an overview on field of flexible biosensor development. We endeavor to show how this subset of the broader field of flexible and wearable devices presents unique characteristics inherent in their design. Initially, a discussion on the structure of flexible biosensors is presented to address the critical issues specific to their design. We then summarize the different materials as substrates that can resist mechanical deformation while retaining their function of the bioreceptors and active elements. Several examples of flexible biosensors are presented based on the different environments in which they may be deployed or on the basis of targeted biological analytes. Challenges and future perspectives pertinent to the current and future stages of development are presented. Through these summaries and discussion, this review is expected to provide insights towards a systematic and fundamental understanding for the fabrication and utilization of flexible biosensors, as well as inspire and improve designs for smart and effective devices in the future.

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Section: Flexible Substrate Materialsmentioning

confidence: 99%

The design, fabrication, and applications of flexible biosensing devices

Meng

Obodo

Yadavalli

2019

Biosensors and Bioelectronics

150

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“…19,[23][24][25][26] Inorganic semiconductors represent the foundations for all conventional, commercialized types of electronic devices, due primarily to performance characteristics that significantly exceed those of known organic materials, including high-field-effect mobilities and long-term stability under mechanical, electrical, and environmental stress. [27][28][29][30] A main challenge in the use of inorganic semiconductors and associated traditional processing methods follows from limitations in materials choices and fabrication strategies. For example, most polymer substrates are incompatible with the high temperatures required in traditional procedures for deposition, crystallization, and doping.…”

Section: Introductionmentioning

confidence: 99%

Inorganic semiconducting materials for flexible and stretchable electronics

et al. 2017

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Recent progress in the synthesis and deterministic assembly of advanced classes of single crystalline inorganic semiconductor nanomaterial establishes a foundation for high-performance electronics on bendable, and even elastomeric, substrates. The results allow for classes of systems with capabilities that cannot be reproduced using conventional wafer-based technologies. Specifically, electronic devices that rely on the unusual shapes/forms/constructs of such semiconductors can offer mechanical properties, such as flexibility and stretchability, traditionally believed to be accessible only via comparatively low-performance organic materials, with superior operational features due to their excellent charge transport characteristics. Specifically, these approaches allow integration of high-performance electronic functionality onto various curvilinear shapes, with linear elastic mechanical responses to large strain deformations, of particular relevance in bio-integrated devices and bio-inspired designs. This review summarizes some recent progress in flexible electronics based on inorganic semiconductor nanomaterials, the key associated design strategies and examples of device components and modules with utility in biomedicine.

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“…Functional materials assembled from inorganic nanocrystals are currently in the focus of intense research efforts aiming at various advanced applications, such as flexible electronics [1,2,3], flexible displays and photovoltaic cells [4,5], chemical and physical sensors [6,7,8], as well as protective and photocatalytic coatings [9]. Obviously, such applications require specific mechanical properties of employed materials.…”

Section: Introductionmentioning

confidence: 99%

Elasticity of Cross-Linked Titania Nanocrystal Assemblies Probed by AFM-Bulge Tests

et al. 2019

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In order to enable advanced technological applications of nanocrystal composites, e.g., as functional coatings and layers in flexible optics and electronics, it is necessary to understand and control their mechanical properties. The objective of this study was to show how the elasticity of such composites depends on the nanocrystals’ dimensionality. To this end, thin films of titania nanodots (TNDs; diameter: ~3–7 nm), nanorods (TNRs; diameter: ~3.4 nm; length: ~29 nm), and nanoplates (TNPs; thickness: ~6 nm; edge length: ~34 nm) were assembled via layer-by-layer spin-coating. 1,12-dodecanedioic acid (12DAC) was added to cross-link the nanocrystals and to enable regular film deposition. The optical attenuation coefficients of the films were determined by ultraviolet/visible (UV/vis) absorbance measurements, revealing much lower values than those known for titania films prepared via chemical vapor deposition (CVD). Scanning electron microscopy (SEM) and transmission electron microscopy (TEM) images showed a homogeneous coverage of the substrates on the µm-scale but a highly disordered arrangement of nanocrystals on the nm-scale. X-ray photoelectron spectroscopy (XPS) analyses confirmed the presence of the 12DAC cross-linker after film fabrication. After transferring the films onto silicon substrates featuring circular apertures (diameter: 32–111 µm), freestanding membranes (thickness: 20–42 nm) were obtained and subjected to atomic force microscopy bulge tests (AFM-bulge tests). These measurements revealed increasing elastic moduli with increasing dimensionality of the nanocrystals, i.e., 2.57 ± 0.18 GPa for the TND films, 5.22 ± 0.39 GPa for the TNR films, and 7.21 ± 1.04 GPa for the TNP films.

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Flexible Electronics: Integration Processes for Organic and Inorganic Semiconductor-Based Thin-Film Transistors

Cited by 51 publications

References 79 publications

The design, fabrication, and applications of flexible biosensing devices

The design, fabrication, and applications of flexible biosensing devices

Inorganic semiconducting materials for flexible and stretchable electronics

Elasticity of Cross-Linked Titania Nanocrystal Assemblies Probed by AFM-Bulge Tests

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