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The properties of quantum cascade laser (QCL) structures have been investigated by optical technique based on spontaneous emission measurements: photoluminescence excitation (PLE) spectroscopy. Three types of test structures used for obtaining final QCL device were examined , i.e., single sequence of coupled quantum wells, which form an active region of the device, 30 sequences of this active region...
Because of the undeniable advantages of powder electroluminescent light sources the authors have designed and tested an animated thick film electroluminescent advertising panel. The paper describes the design steps and phases of the technological process. Finally, the brightness characteristics and influence of color translucent inks covering the segments are presented. The expected life time of the...
In the work a numerical method of dissolving the Poisson equation in an electrostatically formed Quantum Point Contact (QPC) is described. Such a device is based on the structure called ISIS (Inverted Semiconductor Insulator Semiconductor). This structure was proposed in 1991 by Kastner [1] who made single electron transistor in it. In this paper the Poisson equation is solved by means of boundary...
In the work we present self-consistent solutions of Poisson and Schrödinger equations which describe electron states in coupled quantum dots. Results for two neighbouring quantum dots formed in an electrostatic way are discussed. Zero-dimensional electron gas is investigated in the structure proposed by Kastner [1] and presented in our earlier works [2-4]. In the work results of simulations performed...
Numerical modeling is a widespread tool in microelectronics, which is used generally for support of the prototyping stage. One of the novel numerical tools that are currently emerging is technique based on molecular modeling. Molecular modeling is well known and utilized method in chemistry, biology, medicine, biotechnology, pharmacy and physics. Scientists and researchers have been using molecular...
We report the galvanomagnetic properties of Hall and magnetoresistor cross-shaped sensors with lateral dimensions 2x3 mm. The comparative study of epilayers fabricated by MBE and MOCVD are presented. The measured parameters of these devices gave an interesting insight into their behaviour at temperatures ranging from LHe to room temperature. The large changes of the galvanomagnetic parameters vs....
Adiabatic Logic is a promising approach with respect to power optimization in digital circuit design. In the recent years researches are carried out to design low power memories using this concept. The various adiabatic memories proposed in the recent years are outlined in this paper.
In this paper, the capacity of the Code Division Multiple Access Wireless Local Loop (CDMA WLL) sysytem is analytically derived, and the capacity gain achieved in a CDMA WLL over a cellular mobile environment is calculated. The results show that the CDMA WLL system can support up to 36% more users than CDMA cellular mobile system. The paper also propose a new approach to increase the reverse lonk...
Various chemical treatments of GaSb and related compounds has been studied with the aim to develop procedures of polishing of GaSb substrates, preparation of their surfaces for deposition of metal and dielectric films, for liquid phase epitaxial growth, and finally fabrication of passivating coatings on surfaces of GaSb and its alloys. A broad spectrum of surface characterisation techniques has been...
A COMOS four-guadrant analog multiplier has been designed wihout any passive components to produce a highly linear single-ended output. A fundamental Gilbert-cell circuits is coupled with a CMOS adder circuit and operational amplifier to produce a highly linear four-quadrant multiplier. The circuit achieves high speed operation and eliminates all passive components. The entire circuit is designed...
In the paper results of fitting of current-voltage (I-V) curves acquired in a wide range of irradiances and temperatures with use of equivalent either single (SEM) or double (DEM) diode model as applied to several commercial thin-film photovoltaic (PV) modules are presented. It is shown that like in case of crystalline silicon PV modules also for CIGS (CuInGaSe2) as well as CdTe thin-film modules...
Scanning acoustic microscopy (SAM) is an attractive tool in the non-destructive inspection of printed circuit boards, thick film, thin layers and microelectronic packages. For example it permits to detect subsurface delaminations, cracks and pores (air bubbles) for different materials: metals, plastics, ceramics or composites. The examples of different electronic components and circuits observed in...
Packaging is the las step of the manufacturing processes of microsystems. The LPM is working on the development of a two-part soldered packaging. One part of the package is metallic; the other part is made of glass. The goal of the project is to solder the two parts of the package using a laser diode. The advantage of the laser soldered joint are its hermeticity to water and air in regard to glue...
LTCC technology gives the possibility to form spatial structures and can be used to produce components, applied in analytical fluidic systems. This paper will discuss related construction of Y-shaped mixer with microchannels, including cutting process in two lamination layers of LTCC using CO₂ laser. The sample was fabricated by combination of LTCC structure with PMMA covers (polymethylmethacrylate)...
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