Laura Basiricò - Academia.edu (original) (raw)
Papers by Laura Basiricò
2010 Annual International Conference of the IEEE Engineering in Medicine and Biology, 2010
In this paper we propose totally flexible organic field effect transistors (OFETs) assembled on p... more In this paper we propose totally flexible organic field effect transistors (OFETs) assembled on plastic films as sensors for mechanical variables. First mechanical sensors for pressure and bending detection are presented. A sharp and reversible sensitivity of the output current of the device to an elastic deformation induced by means of a mechanical stimulus on the device channel has been observed and suggested the idea of employing arrays of such sensors for detecting the deformation applied onto a planar surface. Second the possibility of using similar devices for bio-and chemo-detection is described. By exploiting the properties of the basic structure, the device can be combined with any kind of substrate to detect for instance the pressure applied by people walking or standing on a functionalized carpet. This emerging technology seems to be promising for applications in the field of remote and non invasive monitoring of elderly and disabled people.
Faraday Discuss., 2014
So far, organic semiconductors have been mainly proposed as detectors for ionizing radiation in t... more So far, organic semiconductors have been mainly proposed as detectors for ionizing radiation in the indirect conversion approach, i.e. as scintillators, which convert ionizing radiation into visible photons, or as photodiodes, which detect visible photons coming from a scintillator and convert them into an electrical signal. The direct conversion of ionizing radiation into an electrical signal within the same device is a more effective process than indirect conversion, since it improves the signal-to-noise ratio and it reduces the device response time. We report here the use of Organic Semiconducting Single Crystals (OSSCs) as intrinsic direct ionizing radiation detectors, thanks to their stability, good transport properties and large interaction volume. Ionizing radiation X-ray detectors, based on low-cost solution-grown OSSCs, are here shown to operate at room temperature, providing a stable linear response with increasing dose rate in the ambient atmosphere and in high radiation environments.
The Fourth IEEE RAS/EMBS International Conference on Biomedical Robotics and Biomechatronics Roma, Italy. June 24-27, 2012, 2012
Abstract² We present a novel and flexible system to be employed for tactile transduction in the r... more Abstract² We present a novel and flexible system to be employed for tactile transduction in the realization of artificial ³URERW VNLQ´ 7KH PHFKDQLFDO GHIRUPDWLRQ GHWHFWLRQ ZKLFK functionally reproduces the sense of touch, is based on Organic Thin Film Transistors (OTFTs) assembled on a flexible plastic foil, where each device acts as a strain sensor. OTFT-based mechanical sensors were fabricated employing a solutionprocessable organic semiconductor, namely 6,13bis(triisopropylsilylethynyl)-pentacene (TIPS-pentacene) deposited by drop casting. It will be shown that the surface deformation induced by an external mechanical stimulus gives rise in both cases to a marked, reproducible, and reversible (within a certain range of surface deformation) variation of the device output current.
ACS Photonics, 2014
ABSTRACT In this work, we report on the fabrication and characterization of organic light-emittin... more ABSTRACT In this work, we report on the fabrication and characterization of organic light-emitting transistors (OLETs) within an indium–tin-oxide (ITO)-free platform, using graphene-based transparent conductive electrodes in place of ITO as gate electrode. A direct comparison between twin bottom-gate/top-contacts OLETs, where a standard ITO layer is replaced with a film made of a few graphene layers, shows that comparable electrical characteristics can be obtained along with a clear improvement in the electroluminescence generation characteristics. Our experimental findings pave the way to the exploitation of graphene-based transparent conductive electrodes within this class of emerging devices on flexible substrates, further promoting the novel era of flexible organic electronics.
MRS Proceedings, 2012
In this paper we introduce a novel, flexible, system for mechanical deformation detection. The co... more In this paper we introduce a novel, flexible, system for mechanical deformation detection. The core of the system is based on an Organic Thin Film Transistor (OTFT) which has been assembled on a flexible PET substrate and patterned by means of inkjet printing. OTFT-based mechanical sensors were fabricated employing two different organic semiconductors, namely a small molecule (pentacene) deposited by thermal evaporation and its solution-processable derivative 6,13-bis(triisopropylsilylethynyl)-pentacene (TIPS-pentacene) deposited by drop casting. It will be shown that the surface deformation induced by an external mechanical stimulus gives rise in both cases to a marked, reproducible and reversible (within a certain rage of surface deformation) variation of the device output current. Starting from these results, more complex structures such as arrays and matrices of OTFT-based mechanical sensors have been fabricated by means of inkjet printing. Thanks to the flexibility of the introduced structure, we will show that the presented system can be transferred on different surfaces (hard and soft) and employed for a wide range of applications. In particular, we have designed and fabricated a fully functional system based on a matrix of 64 elements that can be employed for detecting mechanical stimuli over larger areas, and will demonstrate that such a system can be successfully employed for tactile transduction in the realization of artificial "robot skins".
Semiconductor Science and Technology, 2009
We report on the modification in the density of states of a multi-quantum well system of InGaN/Ga... more We report on the modification in the density of states of a multi-quantum well system of InGaN/GaN-based light emitting diodes. The modification was induced by dc current stress at I = 50 mA (current density J = 55 A cm-2) with stress times up to 100 h. The samples were characterized by means of current-voltage and capacitance-voltage, and photocurrent spectroscopy
Organic Electronics, 2012
We report on the fabrication and characterization of inkjet-printed, all-Organic Electro-Chemical... more We report on the fabrication and characterization of inkjet-printed, all-Organic Electro-Chemical Transistors (OECTs) entirely realized by a conducting polymer, namely poly(3,4-ethylenedioxythiophene) doped with poly(styrene sulfonic acid) (PEDOT:PSS). The transistors utilized saline as the electrolyte and exhibited output characteristics typical for operation in depletion regime. The transfer characteristics could be tuned on the basis of device geometry, with the ratio between the area of the channel and the area of the gate electrode determining the transconductance. This work paves the road for the low-cost, print-on-demand fabrication of circuits for applications in bio-sensors and disposable electronics.
IEEE Sensors Journal, 2000
In this paper we propose a detailed investigation on the electrical response to mechanical deform... more In this paper we propose a detailed investigation on the electrical response to mechanical deformations of organic field effect transistors assembled on flexible plastic substrates. We demonstrate that through applying a surface deformation by an external mechanical stimulus we induce morphological and structural changes in the organic semiconductor giving rise to a marked, reproducible and reversible variation of the device output current. We show how the intrinsic properties of the employed active layers play a crucial role in determining the final sensitivity to the mechanical deformation. Finally we also demonstrate that the fabricated flexible system can be successfully employed for different applications that go from the detection of bio-mechanical parameters (e.g., joint motion, breath rate, etc.) in the wearable electronics field to tactile transduction for the realization of artificial robot skin
IEEE Sensors Journal, 2000
The paper focuses on the manufacturing technology of modular components for large-area tactile se... more The paper focuses on the manufacturing technology of modular components for large-area tactile sensors, which are made of arrays of polyvinylidene fluoride (PVDF) piezoelectric polymer taxels integrated on flexible PCBs. PVDF transducers were chosen for the high electromechanical transduction frequency bandwidth (up to 1 kHz for the given application). Patterned electrodes were inkjet printed on the PVDF film. Experimental tests on skin module prototypes demonstrate the feasibility of the proposed approach and reveal the potentiality to build large area flexible and conformable robotic skin.
The present paper presents the manufacturing technology of a robot skin made of 2D arrays of piez... more The present paper presents the manufacturing technology of a robot skin made of 2D arrays of piezoelectric transducers. Inkjet printing has been used to provide the piezoelectric film of patterned electrodes. The experimental tests on fabricated skin prototypes reveal the reliability and potentialities of the proposed technology to fabricate large area robot skin. The challenge is to obtain an effective robotic touch sensing system which not only provides fast response, high spatial resolution and wide dynamics but which is also able to cope the requirements of robustness, scalability, reproducibility, light weight and low cost necessary to build a large area skin system.
IEEE Sensors Journal, 2000
The paper focuses on the manufacturing technology of modular components for large-area tactile se... more The paper focuses on the manufacturing technology of modular components for large-area tactile sensors, which are made of arrays of polyvinylidene fluoride (PVDF) piezoelectric polymer taxels integrated on flexible PCBs. PVDF transducers were chosen for the high electromechanical transduction frequency bandwidth (up to 1 kHz for the given application). Patterned electrodes were inkjet printed on the PVDF film. Experimental tests on skin module prototypes demonstrate the feasibility of the proposed approach and reveal the potentiality to build large area flexible and conformable robotic skin.
2010 Annual International Conference of the IEEE Engineering in Medicine and Biology, 2010
In this paper we propose totally flexible organic field effect transistors (OFETs) assembled on p... more In this paper we propose totally flexible organic field effect transistors (OFETs) assembled on plastic films as sensors for mechanical variables. First mechanical sensors for pressure and bending detection are presented. A sharp and reversible sensitivity of the output current of the device to an elastic deformation induced by means of a mechanical stimulus on the device channel has been observed and suggested the idea of employing arrays of such sensors for detecting the deformation applied onto a planar surface. Second the possibility of using similar devices for bio-and chemo-detection is described. By exploiting the properties of the basic structure, the device can be combined with any kind of substrate to detect for instance the pressure applied by people walking or standing on a functionalized carpet. This emerging technology seems to be promising for applications in the field of remote and non invasive monitoring of elderly and disabled people.
Faraday Discuss., 2014
So far, organic semiconductors have been mainly proposed as detectors for ionizing radiation in t... more So far, organic semiconductors have been mainly proposed as detectors for ionizing radiation in the indirect conversion approach, i.e. as scintillators, which convert ionizing radiation into visible photons, or as photodiodes, which detect visible photons coming from a scintillator and convert them into an electrical signal. The direct conversion of ionizing radiation into an electrical signal within the same device is a more effective process than indirect conversion, since it improves the signal-to-noise ratio and it reduces the device response time. We report here the use of Organic Semiconducting Single Crystals (OSSCs) as intrinsic direct ionizing radiation detectors, thanks to their stability, good transport properties and large interaction volume. Ionizing radiation X-ray detectors, based on low-cost solution-grown OSSCs, are here shown to operate at room temperature, providing a stable linear response with increasing dose rate in the ambient atmosphere and in high radiation environments.
The Fourth IEEE RAS/EMBS International Conference on Biomedical Robotics and Biomechatronics Roma, Italy. June 24-27, 2012, 2012
Abstract² We present a novel and flexible system to be employed for tactile transduction in the r... more Abstract² We present a novel and flexible system to be employed for tactile transduction in the realization of artificial ³URERW VNLQ´ 7KH PHFKDQLFDO GHIRUPDWLRQ GHWHFWLRQ ZKLFK functionally reproduces the sense of touch, is based on Organic Thin Film Transistors (OTFTs) assembled on a flexible plastic foil, where each device acts as a strain sensor. OTFT-based mechanical sensors were fabricated employing a solutionprocessable organic semiconductor, namely 6,13bis(triisopropylsilylethynyl)-pentacene (TIPS-pentacene) deposited by drop casting. It will be shown that the surface deformation induced by an external mechanical stimulus gives rise in both cases to a marked, reproducible, and reversible (within a certain range of surface deformation) variation of the device output current.
ACS Photonics, 2014
ABSTRACT In this work, we report on the fabrication and characterization of organic light-emittin... more ABSTRACT In this work, we report on the fabrication and characterization of organic light-emitting transistors (OLETs) within an indium–tin-oxide (ITO)-free platform, using graphene-based transparent conductive electrodes in place of ITO as gate electrode. A direct comparison between twin bottom-gate/top-contacts OLETs, where a standard ITO layer is replaced with a film made of a few graphene layers, shows that comparable electrical characteristics can be obtained along with a clear improvement in the electroluminescence generation characteristics. Our experimental findings pave the way to the exploitation of graphene-based transparent conductive electrodes within this class of emerging devices on flexible substrates, further promoting the novel era of flexible organic electronics.
MRS Proceedings, 2012
In this paper we introduce a novel, flexible, system for mechanical deformation detection. The co... more In this paper we introduce a novel, flexible, system for mechanical deformation detection. The core of the system is based on an Organic Thin Film Transistor (OTFT) which has been assembled on a flexible PET substrate and patterned by means of inkjet printing. OTFT-based mechanical sensors were fabricated employing two different organic semiconductors, namely a small molecule (pentacene) deposited by thermal evaporation and its solution-processable derivative 6,13-bis(triisopropylsilylethynyl)-pentacene (TIPS-pentacene) deposited by drop casting. It will be shown that the surface deformation induced by an external mechanical stimulus gives rise in both cases to a marked, reproducible and reversible (within a certain rage of surface deformation) variation of the device output current. Starting from these results, more complex structures such as arrays and matrices of OTFT-based mechanical sensors have been fabricated by means of inkjet printing. Thanks to the flexibility of the introduced structure, we will show that the presented system can be transferred on different surfaces (hard and soft) and employed for a wide range of applications. In particular, we have designed and fabricated a fully functional system based on a matrix of 64 elements that can be employed for detecting mechanical stimuli over larger areas, and will demonstrate that such a system can be successfully employed for tactile transduction in the realization of artificial "robot skins".
Semiconductor Science and Technology, 2009
We report on the modification in the density of states of a multi-quantum well system of InGaN/Ga... more We report on the modification in the density of states of a multi-quantum well system of InGaN/GaN-based light emitting diodes. The modification was induced by dc current stress at I = 50 mA (current density J = 55 A cm-2) with stress times up to 100 h. The samples were characterized by means of current-voltage and capacitance-voltage, and photocurrent spectroscopy
Organic Electronics, 2012
We report on the fabrication and characterization of inkjet-printed, all-Organic Electro-Chemical... more We report on the fabrication and characterization of inkjet-printed, all-Organic Electro-Chemical Transistors (OECTs) entirely realized by a conducting polymer, namely poly(3,4-ethylenedioxythiophene) doped with poly(styrene sulfonic acid) (PEDOT:PSS). The transistors utilized saline as the electrolyte and exhibited output characteristics typical for operation in depletion regime. The transfer characteristics could be tuned on the basis of device geometry, with the ratio between the area of the channel and the area of the gate electrode determining the transconductance. This work paves the road for the low-cost, print-on-demand fabrication of circuits for applications in bio-sensors and disposable electronics.
IEEE Sensors Journal, 2000
In this paper we propose a detailed investigation on the electrical response to mechanical deform... more In this paper we propose a detailed investigation on the electrical response to mechanical deformations of organic field effect transistors assembled on flexible plastic substrates. We demonstrate that through applying a surface deformation by an external mechanical stimulus we induce morphological and structural changes in the organic semiconductor giving rise to a marked, reproducible and reversible variation of the device output current. We show how the intrinsic properties of the employed active layers play a crucial role in determining the final sensitivity to the mechanical deformation. Finally we also demonstrate that the fabricated flexible system can be successfully employed for different applications that go from the detection of bio-mechanical parameters (e.g., joint motion, breath rate, etc.) in the wearable electronics field to tactile transduction for the realization of artificial robot skin
IEEE Sensors Journal, 2000
The paper focuses on the manufacturing technology of modular components for large-area tactile se... more The paper focuses on the manufacturing technology of modular components for large-area tactile sensors, which are made of arrays of polyvinylidene fluoride (PVDF) piezoelectric polymer taxels integrated on flexible PCBs. PVDF transducers were chosen for the high electromechanical transduction frequency bandwidth (up to 1 kHz for the given application). Patterned electrodes were inkjet printed on the PVDF film. Experimental tests on skin module prototypes demonstrate the feasibility of the proposed approach and reveal the potentiality to build large area flexible and conformable robotic skin.
The present paper presents the manufacturing technology of a robot skin made of 2D arrays of piez... more The present paper presents the manufacturing technology of a robot skin made of 2D arrays of piezoelectric transducers. Inkjet printing has been used to provide the piezoelectric film of patterned electrodes. The experimental tests on fabricated skin prototypes reveal the reliability and potentialities of the proposed technology to fabricate large area robot skin. The challenge is to obtain an effective robotic touch sensing system which not only provides fast response, high spatial resolution and wide dynamics but which is also able to cope the requirements of robustness, scalability, reproducibility, light weight and low cost necessary to build a large area skin system.
IEEE Sensors Journal, 2000
The paper focuses on the manufacturing technology of modular components for large-area tactile se... more The paper focuses on the manufacturing technology of modular components for large-area tactile sensors, which are made of arrays of polyvinylidene fluoride (PVDF) piezoelectric polymer taxels integrated on flexible PCBs. PVDF transducers were chosen for the high electromechanical transduction frequency bandwidth (up to 1 kHz for the given application). Patterned electrodes were inkjet printed on the PVDF film. Experimental tests on skin module prototypes demonstrate the feasibility of the proposed approach and reveal the potentiality to build large area flexible and conformable robotic skin.