Clara Santato

Clara Santato
Polytechnique Montréal · Department of Engineering Physics

PhD

About

83
Publications
22,015
Reads
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4,205
Citations
Citations since 2017
11 Research Items
1649 Citations
2017201820192020202120222023050100150200250300
2017201820192020202120222023050100150200250300
2017201820192020202120222023050100150200250300
2017201820192020202120222023050100150200250300
Additional affiliations
October 2007 - September 2009
Cornell University
Position
  • Visiting Scientist
August 2007 - January 2015
Polytechnique Montréal
Position
  • Professor (Associate)
May 2006 - July 2007
McGill University
Position
  • Visiting Scientist

Publications

Publications (83)
Article
A positive effect of molecular relaxations, the movement of the molecular backbone and of chain segments on charge carrier transport processes in organic semiconductors, has not previously been reported. In...
Article
Eumelanin is the most common form of the pigment melanin in the human body, with diverse functions including photoprotection, antioxidant behavior, metal chelation, and free radical scavenging. Melanin also plays a role in melanoma skin cancer and Parkinson’s disease. Sepia Melanin is a natural eumelanin extracted from the ink sac of cuttlefish. Eu...
Chapter
Organic (carbon-based) electronic materials have been intensively investigated in recent decades, with the result that many applications of organic electronics - organic light-emitting diodes (OLEDs),(OLEDs), for example -- have successfully reached commercialization. Green electronics aims at limiting the environmental footprint of electronics by...
Conference Paper
References 1. Bettinger, C. J., Bruggeman, J. P., Misra, A., Borenstein, J. T. & Langer, R. Biocompatibility of biodegradable semiconducting melanin films for nerve tissue engineering. Biomaterials 30, 3050–3057 (2009). 2. Gomez, E. F. & Steckl, A. J. Green Materials for Electronics. Green Materials for Electronics (Wiley-VCH, 2018). 3. Irimia-Vlad...
Poster
Organic electronic materials have been widely investigated as a valid complement to conventional electronic technologies, owing to their mechanical properties and large area printability 1,2. Green electronics recently opened new research avenues to use bio-sourced, biocompatible (possibly biodegradable) materials to limit the environmental impact...
Poster
Eumelanin is an hygroscopic biopolymer synthesized by the oxidative polymerization of (5,6)-dihydroxindole (DHI) and (5,6)-dihydroxindole 2-carboxyl acid (DHICA) building blocks. Different available polymerization sites with a wide variety of supramolecular arrangements and co-existing redox states (hydroquinone, semiquinone, quinone), bring chemic...
Article
Metal oxide semiconductors are interesting for next generation flexible and transparent electronics due to their performance and reliability. Tin dioxide (SnO2) is a very promising material that has already found applications in sensing, photovoltaics, optoelectronics and batteries. In this work, we report on electrolyte-gated, solution-processed p...
Article
Bis(2-phenylpyridine-C,N)(2,2′-bipyridine-N,N′) iridium(III) hexafluorophosphate ([Ir(ppy)2(bpy)][PF6]) is an ionic transition-metal complex (iTMC) of interest for use in light-emitting electrochemical cells (LEECs). Films of [Ir(ppy)2(bpy)][PF6] blended with the ionic liquid 1-butyl-3-methylimidazolium hexafluorophosphate ([BMIm][PF6]), deposited...
Article
Full-text available
Melanin (from the Greek μέλας, mélas, black) is a biopigment ubiquitous in flora and fauna, featuring broadband optical absorption, hydration-dependent electrical response, ion-binding affinity as well as antioxidative and radical-scavenging properties. In the human body, photoprotection in the skin and ion flux regulation in the brain are some bio...
Article
Full-text available
Aerogels are light and porous solids whose properties, largely determined by their nanostructure, are useful in a wide range of applications, e.g., thermal insulation. In this work, as-deposited and thermally treated air-filled silica aerogel thin films synthesized using the sol-gel method were studied for their thermal properties using the 3-omega...
Article
Melanins are biopigments ubiquitous in flora and fauna, exhibiting a range of interesting functional properties such as UV-Vis photoprotection, thermoregulation, hydration-dependent electrical conduction and metal chelation. In the human body, melanins can be found in the skin, hair, middle ear, retina and heart. The metal chelation properties of n...
Article
Biocompatible and biodegradable materials that store electrochemical energy are attractive candidates for applications in bioelectronics and electronics for everywhere. Eumelanin is a ubiquitous biopigment in flora and fauna. It exhibits strong broad-band UV-visible absorption, metal chelation as well as good thermal and photo-stability. Eumelanin...
Article
The biopigment eumelanin, ubiquitous in flora and fauna, is made up of chemically heterogeneous macromolecules based on the 5,6-dihydroxyindole (DHI) and 5,6-dihydroxyindole-2-carboxylic acid (DHICA) building blocks. The exciting possibility to design eumelanin-based technologies for bioelectronics and sustainable electronics has to be properly ass...
Article
Metal oxides constitute a class of materials whose properties cover the entire range from insulators to seminconductors to metals. Most metal oxides are abundant and accessible at moderate cost. Metal oxides are widely investigated as channel materials in transistors, including electrolyte-gated transistors, where the charge carrier density can be...
Conference Paper
The boom in multifunctional, flexible, and portable electronics and the increasing need of low-energy cost and autonomy for applications ranging from wireless sensor networks for smart environments to biomedical applications are triggering research efforts towards the development of self-powered sustainable electronic devices. Within this context,...
Article
Full-text available
Upconverting materials are currently explored in the field of solar energy conversion in order to extend the light harvesting properties of semiconductors to the near-infrared (NIR) region, their absorption being generally limited to the visible region of the solar spectrum. Here, we propose to photosensitize nanostructured films of tungsten oxide...
Article
Electrolyte-gated (EG) transistors, based on electrolyte gating media, are powerful device structures to modulate the charge carrier density of materials by orders of magnitude, at relatively low operating voltages (sub-2 V). Tungsten trioxide (WO3) is a metal oxide semiconductor well investigated for applications in electrochromism, sensing, photo...
Article
Full-text available
Organic Electrochemical Transistors (OECTs) are widely investigated for application in bioelectronics. Ionic liquids (ILs) are, in principle, interesting candidates as gating media in OECTs. Nevertheless, ILs can exhibit excessively high viscosity that prevents their straightforward application in OECTs. Here we report two processing approaches to...
Article
Full-text available
Electrolyte-Gated (EG) transistors, making use of electrolytes as the gating medium, are interesting for their low operation voltage. Furthermore, EG polymer transistors offer the advantage of solution processing, low cost, and mechanical flexibility. Despite the intense research activity in EG transistors, clear guidelines to correlate the propert...
Article
Model systems are critical to our understanding of self-assembly processes. As such, we have studied the surface self-assembly of a small and simple molecule, indole-2-carboxylic acid (I2CA). We combine density functional theory gas-phase (DFT) calculations with scanning tunneling microscopy to reveal details of I2CA assembly in two different solve...
Article
The characteristics of the gate electrode have significant effects on the behavior of organic electrochemical transistors (OECTs), which are intensively investigated for applications in the booming field of organic bioelectronics. In this work, high specific surface area activated carbon (AC) was used as gate electrode material in OECTs based on th...
Article
The capability of efficiently injecting charge carriers into organic films and finely tuning their morphology and structure is crucial to improve the performance of organic thin film transistors (OTFTs). In this work, we investigate OTFTs employing carbon nanotubes (CNTs) as the source-drain electrodes and, as the organic semiconductor, thin films...
Article
Full-text available
We report the proof-of-concept of the TransCap, a monolithically integrated device that exhibits the storage properties of a supercapacitor and the low-voltage operation of an electrolyte-gated transistor. The proof-of-concept is based on coupling a polymer channel with a high surface area carbon gate, employing an ionic liquid as the electrolyte....
Article
Full-text available
The thin flexible, lightweight nature of organic semiconductor devices makes them a prime candidate for medical imaging applications such as rugged X-ray imagers for use in hospitals (i.e., immune to minor drops or shocks) or even curved X-ray imagers for specialized imaging modalities of the future (e.g., compression free breast imaging). However,...
Article
In electrolyte-gated transistors, the exceptionally high capacitance of the electrical double layer forming at the electrolyte/transistor channel interface permits current modulations of several orders of magnitude, at relatively low gate voltages. The effect of the nature of the gate electrode on the performance of electrolyte-gated transistors is...
Article
Full-text available
In this chapter we focus on a novel boosting development of organic electronics that exploits the mixed electronic and ionic conduction that certain organic materials can sustain, to produce a wide range of devices with potential applications in bioelectronics. Examples of such devices are organic electrochemical transistors and miniaturized bio-la...
Article
Eumelanin is a ubiquitous pigment in the human body, animals, and plants, with potential for bioelectronic applications because of its unique set of physical and chemical properties, including strong UV-vis absorption, mixed ionic/electronic conduction, free radical scavenging and anti-oxidant properties. Herein, a detailed investigation is reporte...
Book
An overview of the tremendous potential of organic electronics, concentrating on those emerging topics and technologies that will form the focus of research over the next five to ten years. The young and energetic team of editors with an excellent research track record has brought together internationally renowned authors to review up-and-coming to...
Article
Full-text available
Eumelanin pigments show hydration-dependent conductivity, broad-band UV-vis absorption, and chelation of metal ions. Solution-processing of synthetic eumelanins opens new possibilities for the characterization of eumelanin in thin film form and its integration into bioelectronic devices. We investigate the effect of different synthesis routes and p...
Article
This perspective deals with the coupling of ionic and electronic transport in organic electronic devices, focusing on electrolyte-gated transistors. These include electrolyte-gated organic field-effect transistors (EG-OFETs) and organic electrochemical transistors (OECTs). EG-OFETs, based on molecules and polymers, can be operated at low electrical...
Article
Full-text available
The scope of this Minireview is to provide an overview of the recent progress on carbon nanotube electrodes applied to organic thin film transistors. After an introduction on the general aspects of the charge injection processes at various electrode-semiconductor interfaces, we discuss the great potential of carbon nanotube electrodes for organic t...
Article
Full-text available
This perspective deals with the coupling of ionic and electronic transport in organic electronic devices, focusing on electrolyte-gated transistors. These include electrolyte-gated organic eld-eect transistors (EG-OFETs) and organic electrochemical transistors (OECTs). EG-OFETs, based on molecules and polymers, can be operated at low electrical b...
Article
Organic electrochemical transistors (OECTs) exploit electrolyte gating to achieve the transduction of ionic currents. Therefore, they are ideally suitable to sense different chemo/bio species dissolved in the electrolyte. Current modulation in OECTs relies on doping or dedoping of the OECT channel by electrolyte ions. Nevertheless the role played b...
Article
In this work, we explored the capacity of π-Conjugated Thiopheno-Azomethines in the form of thin films for use in organic electronic applications. The charge-carrier transport properties of the π-Conjugated Thiopheno-Azomethines were obtained in field-effect transistor configuration after the characterization of the film forming properties by fluor...
Article
Full-text available
The complex interplay of dielectric substrate properties, semiconducting film growth, crystal structure, texture, and charge carrier transport is investigated for the case of tetracene films deposited on different dielectrics (polystyrene, parylene C, polymethylmethacrylate, hexamethyldisilazane-treated SiO2, and untreated SiO2). The tetracene hole...
Article
Full-text available
Multifunctional organic materials can be used to make optically tunable organic transistors that can operate on microsecond timescales, thus opening new perspectives in the design of organic integrated circuits.
Article
Eumelanin is a biomolecule with important functions in the human body, animals, and plants. However, several fundamental properties of eumelanin, such as the mechanism of charge carrier transport and the supramolecular structure, are still a matter of debate. This work is the first step of a study with the long-term goal to characterize structure a...
Article
Organic electrochemical transistors (OECTs) are promising for applications in sensing and bioelectronics. OECTs consist of a conducting polymer film (transistor channel) in contact with an electrolyte. A gate electrode immersed in the electrolyte controls the doping/dedoping level of the conducting polymer. OECTs can be operated in aqueous electrol...
Article
Full-text available
Here we report fabrication of flexible and stretchable battery composed of strain free LiFePO4 cathode, Li4Ti5O12 anode and a solid poly ethylene oxide (PEO) electrolyte as a separator layer. The battery is developed in a view of smart textile applications. Featuring solid thermoplastic electrolyte as a key enabling element this battery is potentia...
Article
Full-text available
We report on ambipolar thin film transistors based on solution-deposited films of a pentacene derivative, 2,3-dicyano-6,13-bis-(triisopropylsilylethynyl)pentacene (2,3-CN2-TIPS-Pn). The ambipolar charge transport observed in this material is well balanced; the values of the hole and electron mobility are both about 2 x 10(-3) cm(2)/Vs. The position...
Article
Full-text available
The use of polymer dielectrics is an important step towards large-area, flexible, and low-cost electronics. In this letter, we study the effect of the polymer dielectrics polystyrene and parylene C on the charge transport properties of tetracene thin films in transistor configuration. By using polymer dielectrics, the tetracene hole mobility increa...
Article
Full-text available
The use of carbon nanotube electrodes and new device geometries is enhancing the performance of organic light-emitting transistors.
Conference Paper
Full-text available
We present a study on the thin film morphology and the optical properties of eumelanin resulting from different synthesis routes: the oxidation of tyrosine with hydrogen peroxide, the auto-oxidation of dihydroxyphenylanaline in water and its auto-oxidation in dimethyl sulfoxid. Atomic Force Microscopy images indicate that the presence of holes and...
Article
Full-text available
Organic electrochemical transistors (OECTs) are attracting a great deal of interest for biosensing and bioelectronics applications. However, their device physics is not yet well-understood. In this paper, we focus on the effect of the gate electrode material on the response of OECTs. We studied OECTs made from the conducting polymer poly(3,4-ethyle...
Article
To improve organic electronic devices, the principles underlying organic-film/metal-electrode interfaces must be understood. A comprehensive study of the organic electron acceptor TCNQ on a copper surface reveals a structural rearrangement of both the organic molecule and the metal surface atoms after charge transfer across the interface.
Article
Tetracene vacuum-sublimed films have been used to demonstrate the first Organic Light Emitting Field Effect Transistor (OLEFET), in 2003. Because of their planar configuration, OLEFET are excellent systems to study fundamental processes such as charge injection, transport, and light emission in organic semiconductor films. OLEFET are intensively in...
Article
Full-text available
Novel inner-core dithienothiophene S-oxide and S,S-dioxide oligomers were designed and synthesized. The controlled oxidation at the central sulfur of the dithienothiophene core allows the combined tailoring of the HOMO-LUMO energies, thermal properties, and thin film morphology. Electrochemical measurements indicate that a marked decrease in electr...
Article
Full-text available
We performed an ultra-high vacuum scanning tunneling microscopy (STM) investigation of the self-assembly of rubrene at room temperature on Cu(111), a metal surface with threefold symmetry. Rubrene self-assembles into two different structures called row and trimer. Both are different than the structures already observed on Cu(110) and Cu(100). Row a...
Article
Full-text available
Controlled two-dimensional assembly of organic molecules can be successfully realized by meansof surface nanotemplates that provide surface cues for assembly upon adsorption. Examples of suchtemplates are nanostructured surfaces and organic porous networks. In this review, we discuss theformation and use of such templates for controlled molecular a...
Article
The electrical performance of devices based on organic semiconducting films depend critically on the synthesis and processing of the materials. The quality of organic semiconductors depends on synthetic conditions and purification procedures, which have not yet been optimized. Ultra-pure semiconductors permit to establish sound correlations between...
Article
Full-text available
Organic light emitting field effect transistors based on 2-(4-pentylstyryl)tetracene are able to operate in ambient air and have a shelf lifetime of several months. The Royal Society of Chemistry 2008.
Article
Light emitting field effect transistors based on molecular and polymeric organic semiconductors are multifunctional devices that integrate light emission with the current modulating function of a transistor. The planar geometry of organic light emitting field effect transistors (OLEFETs) offers direct access to the light emission region, providing...
Article
A new electrodeposition condition has been developed to prepare films composed of Sn wires, using dimethyl sulfoxide (DMSO) as a plating medium. The morphology of Sn deposits varied significantly depending on the aging time of the solution as well as the amount of electric charge passed through the cell prior to deposition. The wire morphology was...
Conference Paper
About 3 m thick tungsten trioxide film electrodes consisting of partly sintered, 40-80 nm in diameter, particles deposited on conducting glass substrates exhibit high photon-to-current conversion efficiencies for the photooxidation of water, exceeding 70% at 400 nm. This is facilitated by a ca. 40% film porosity resulting in high contact area with...
Article
Structural properties of tetracene thin films grown by vacuum sublimation on a flexible Mylar # substrate have been investigated by means of synchrotron X-ray diffraction. The films are polycrystalline and are made up of crystalline domains oriented with the (0 0 l) planes almost parallel to the substrate and completely misoriented around the surfa...
Article
Full-text available
Bottom-contact tetracene light-emitting transistors employing a mercaptosilane derivative self-assembled monolayer as adhesive between gold concentric interdigitated source/drain electrodes and SiO2 gate dielectric are described. Devices that employ the mercaptosilane adhesive have a higher mobility and electroluminescence compared to those employi...
Article
Grazing incidence synchrotron X-ray diffraction was used to investigate the structure of vacuum-sublimated tetracene thin films (6– 50 nm thick) deposited on silicon dioxide. The films were found to be polycrystalline with crystallite texturing and size increasing with the deposition flux. This last parameter was found to have a great influence on...
Article
The design, synthesis, thin-film growth, and optoelectronic properties of synthesized dithienothiophene derivative 2,6-bis-(5'-hexyl-[2,2']bithiophen-5-yl)-3,5-dimethyl-dithieno[3,2-b;2',3'-d] thiophen (DTT7Me) is discussed. DTT7Me was synthesized by microwave-assisted Suzuki coupling, and purified by repeated washings with solvents of increasing p...
Article
Full-text available
We report on organic light-emitting (field-effect) transistors (LETs) fabricated on a flexible and transparent plastic foil (Mylar), acting both as substrate and gate dielectric. The foil is patterned on one side with bottom-contact gold source and drain electrodes, while a thin film of gold is evaporated on the opposite side of the foil to form th...
Article
The growth of vacuum-sublimed tetracene thin films on silicon dioxide has been investigated from the early stages of the process. The effects of deposition flux and substrate silanization on film morphology and electrical properties have been explored. Tetracene shows an island growth, resulting in films with a granular structure. Both an increase...
Article
Operation of a photoelectrolyser fitted with a semitransparent semiconducting WO3 film photoanode is described. Due to its band-gap energy of 2.5eV, the photoresponse of the WO3 electrode extends into the blue part of the visible spectrum up to 500nm. The WO3 photoanode exhibits particularly high incident photon-to-current efficiencies for the oxid...
Article
Optoelectronic properties of light-emitting field-effect transistors (LETs) fabricated on bottom-contact transistor structures using a tetracene film as charge-transport and light-emitting material are investigated. Electroluminescence generation and transistor current are correlated, and the bias dependence of the LETs external quantum efficiency...
Article
A cw Ar+ laser crystallization has been performed locally (on a 2 mum sized spot), using a Raman microscope, on plasma enhanced chemical vapor deposition-grown Si films. The deposition has been carried out from differently He-diluted SiH4 so that no high temperature dehydrogenation has been required before the laser treatment. X-ray diffraction pat...