The present paper describes the fabrication and electrical characterization of printed capacitors using polyvinylphenol
(PVP) as dielectric. The recently developed drop-on-demand inkjet printing technology was used to fabricate the
components. The printing ink SunTronic EMD 5603 with silver nanoparticles was used to deposit the capacitors’ plates.
Two different types of structures have been produced. One structure has a single layer of PVP dielectric material, while
the second capacitor has two layers of insulating material. The aim of the work was to determine the influence of the
dielectric thickness on the overall capacity of the device. The structures were submitted to thermal curing treatment prior to measurements. The measured capacity of the devices ranges from 40pF to 400pF depending on the thickness of the dielectric layer.
Organic Electronics (OE), named also FOLAE (Flexible, Organic, (Printed) and Large Area Electronics), is a new branch of electronics, dealing with polymers and plastics, in contrast with traditional electronics, which is based on silicon, copper, oxides, etc. OE acts as a catalyst for the cost effectiveness on the market, being an emerging and fast growing field with high potential in industry. Some OE products (as OLED displays) are already on the market and others (as solar cells, lighting, transistors, etc.) are ready for it, being in the small volume manufacturing stage. Europe has a leading position in OE, mainly due to R and D collaboration, and various European projects try to strengthen this position. On these terms, the paper wants to offer an overview in teaching OE for development of future electronic systems, being destined not only to academia, but also to SMEs, professional associations, and research institutes for exploiting the synergies and complementarities of traditional electronics and OE .].
Nowadays the battery of choice for an electric vehicle (EV) is the Li-Ion. To match the range of an internal combustion
powered vehicle, the EV needs a battery capable of delivering 30–50kWh (commonly the standard capacity is 15 to 20
kWh). The present paper represents a study on a proposed hybrid supercapacitor-battery electric system to control a
reversible electric motor used in demanding application or in automotive applications. When an AC electric motor is
used the deceleration energy (power generation control) is recovered and stored in a battery of supercapacitors. The
designed method uses an electronic control module that has minimal electromagnetic interference due to switching of the power semiconductor device as it passes through zero voltage and filtering of conducted emissions. The supercapacitor battery allows rapid storage and release of energy of 300 - 400A if needed without using the energy stored in the battery system increasing its life cycle.
The paper aims to address the issues of circuit integration of organic thin film transistors (OTFT) into a ring oscillator
module. The stress falls on the optimization of the connections of the inverters in each of the stages of the presented
three-stage ring oscillators. The organic transistors, with Bottom Contact Top Gate architecture, are fabricated using
commercially available materials and accessible deposition techniques, such as spin-coating and metal evaporation. Two ring oscillators are fabricated with manual and patterned interconnections. The first circuit has a widthlength ratio of 1:10 between the load and drive transistors, while the second structure has a 1:30 ratio. The current-voltage
measurements on the individual transistors, as well as the electrical measurements onto inverters and onto the whole
circuit, are performed with a Keithley 4200 Semiconductor Analyzer. All measurements are done in accordance with the
1620.1 standard, in air and under normal ceiling fluorescent light illumination. The stability of the individual devices and the overall circuit is proved to remain constant under normal working conditions.
The paper aims to describe the fabrication of organic transistors and their integration into hybrid circuits on flexible
substrates. Organic thin film transistors (OTFT) are fabricated using commercially available materials. The Au S-D
electrodes are realized by photolithography, while the organic semiconductor and organic dielectric layers are spincoated. Finally, the Au gate electrode is evaporated in order to obtain a Bottom Contact Top Gate OTFT architecture. The paper presents a prototype realized in classic technology on rigid substrate, which is used to perform a PSpice simulation of the circuit. After the PSpice simulation, a module on PET substrate is made with organic transistors. Two transistors are employed to build the inverter used to switch the LED, while a third transistor is diode connected and acts as a 10MOhms resistor. The electrical characterization of the transistors and measurements onto the module are performed with a 4200 Keithley Semiconductor Analyzer. An SMD LED, in 0402 package, is used and all
interconnections are done manually using Silver conductive paste, which dries at room temperature. The paper describes the circuit simulation and layout realization.
The paper presents the results obtained by the authors in the field of the system cosimulation
of optoelectronic sensors. The aim was to make investigations in the multidomain
simulation of the optoelectronic components and devices using PSpice and
MATLAB/Simulink environments. The conclusion of this study is that a co-simulation
environment allows to simulate the whole system using accurate models for the
Despite the fact that today vehicles are easier to drive and more reliable, the drivers' carefulness is diverted by a large
number of factors (road conditions, traffic conditions, phone calls, navigation systems etc.). The automatic system of
controlling the windscreen wipers meets exactly one of the carelessness factors.
A rain sensor makes the activation of the system of windscreen wipers to become something that you turn on and forget
about it. This completely automated system activated by rain measures the rain intensity and also the necessity to turn on
the windscreen wipers and with what velocity.
Using an advanced optical system, analogue signal processing and a control algorithm, this technology offers more
safety and comfort on different weather conditions.
The sensor beams an infrared light on the windshield at an angle carefully chosen. If the windshield is dry, the beam is
reflected back in the sensor. If on the glass there are rain drops, they will reflect the light in different directions (the
wetter the windshield is, the least of the beam ray is reflected back in the sensor).