The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
A high order curvature-compensated CMOS bandgap voltage reference(BGR) is presented in TSMC 0.35μm CMOS technology with low power low temperature-coefficient(TC) and high power supply rejection ratio(PSRR). The design is used in low dropout regulators which is applied in implanted chips. TC is compensated by adjusting resistor ratio which have different temperature characteristics. A PSRR enhance...
The performance of Cu2ZnSnS4(CZTS) solar cell was investigated using a simulator called Solar Cell Capacitance Simulator(SCAPS). An n doped Zinc Oxide(n-ZnO)/Indium Sulfide(In2S3)/CZTS structure was used in the simulation. These materials are cheap and non-toxic which is an important factor keeping the idea of mass production in mind. The performance was recorded for different thicknesses of CZTS...
CdTe-based thin film solar cells have shown strong potentials as viable thin film solar cells for the future, due to several attractive material properties. Its direct bandgap, strong absorption coefficient, ease and multiple deposition methods have favored this material in solar cell research and manufacturing. However, the quality of these thin films, depend on the method and process of fabrication...
CH3NH3PbI3 perovskite is an organic-inorganic hybrid material that has attracted attention recently as a candidate for photovoltaic applications because of its superb semiconductor characteristics. The first principle is adopted to study the structural, density of states and optical properties of orthorhombic self-doped perovskites (CH3NH3)1−xPbI3(A:=0.00, 0.25, 0.50, 0.75, 1.00). With the content...
In this report the effect of substrate temperature on morphology, chemical composition and optical properties of Zn2SnO4 films obtained by pulsed spray pyrolysis technique was investigated. It was found out, that the transmission coefficients of films are of T = (78–89) % in the range of wavelengths λ = (400–1500) nm and the values of band gap are reduced with the increase of the substrate temperature,...
Photonic bandgap fiber have progressed rapidly in recent years and is of great interest for optical fiber sensors applications because of the bandgap effect, high thermos-optical coefficient and birefringence coefficient. The high temperature and stain sensitive is attractive and significant for sensors application. Optimal design themicro-structure of all-solid photonic bandgap fiber with is necessary...
Increasing the temperature stability of the voltage reference through the use of high-order compensation is a common approach, and good agreement allows achieving high temperature stability. The main drawback of this approach is the high sensitivity of the source parameters to the process variation in the manufacture. Changing the supply voltage without additional actions causes a mismatch circuit...
Graphene nanoribbons (GNRs) are considered as a prospective material for next generation nanoelectroic devices as well as optoelectronic devices. In previous literature, it is seen that, armchair GNRs (AGNRs) are always show semiconductor behavior due to considerable band gap. Along with this, excitation of photon to a doped GNRs create an electron hole charged pair. This kind of mechanism is an important...
After the golden era of silicon, nowadays compound semiconductors from III-V group is extensively studied to observe their application in electronic as well as in other field. Solar cell which is providing alternative source in our industries, houses and laboratories. Researchers are now trying to find out new features by using these inorganic materials based solar cell which can easily be paved the...
Analyzing the performance of satellite photovoltaic (PV) array before launch and in space missions is crucial for energy balance and missions success. This study proposes a specific method to predict the electrical characteristics of body mounted solar array for microsatellite. Based on limit data provided by manufacturers and semiconductor band gap, the equivalent circuit model and its parameters...
The thermoelectric properties of CsSnI3 are analysed with the ab initio first-principle density functional theory (DFT). Seebeck coefficient, electrical and thermal conductivities are calculated in order to determine the dimensionless figure of merit ZT. Knowing that CsSnI3 is one of the perovskite series of materials that undergo complex phase transitions with temperature, the calculations are performed...
We report temperature-dependent characterization of the electrical and optical properties of GaAs single junction solar cells up to 450 °C. An external quantum efficiency (EQE) of 75% was maintained at temperatures up to 300 °C, with a corresponding increase in the absorption edge as a function of wavelength due to the decrease in band gap with temperature, in agreement with theory. Above 300 °C,...
Recently, it has been demonstrated that CPP-GMR can be significantly boosted by incorporating new ferromagnetic (FM) full Heulser alloy into spin valve nano-structures[1-4]. Experimental results for two types of non-magnetic spacers (i) (100) textured Ag in combination with FM full Heusler alloys Co2MnSi, Co2Fe(Si-Al) [1], Co2(Mn-Fe)Si (70 % MR and DRA of about 12 mW-mm2) [2] and (ii) non-magnetic...
In this study showed that the single phases CZTSe were successfully synthesized without any other secondary phase existed. EDS measurement results showed that the Cu poor and Zn rich thin films. Subsequently, selenization the CZTSe precursor films were prepared by rapid thermal annealing (RTA). A few minutes of annealing at 550° are sufficient to produce crystalline CZTSe films with grain sizes in...
This paper presents the design of a BJT-based remote temperature sensor to measure ambient temperature in different locations. The sensor chip supplies a calibrated current to the external devices, which are common off-the-shelf bipolar junction transistors — 2N3904 (NPN) and 2N3906 (PNP), and converts their base-emitter voltages to temperature using a 13-bit charge-balancing ΣΔ modulator. Dynamic...
Novel two-dimensional nanostructures of magnesium oxide nanoparticles were synthesized by simple reflux method by changing the solvent and annealing temperature. The structural and surface morphology were investigated using X-ray diffraction spectra and High-resolution scanning electron microscopy (HR-SEM). The XRD spectrum showed that the synthesized MgO samples are pure cubic MgO. The HR-SEM picture...
This paper presents modelling and analysis of multi-junction solar cells to improve the conversion efficiency of photovoltaic (PV) power generation systems. For this modelling, Matlab/Simulink tool is used to obtain the simulation results. The modelling of a single junction solar cell can be performed by single or double diode models. From the simulation results, it was found that the double diode...
The possibility of the construction of the voltage references (VR) is considered, the output voltage of which, unlike the majority of the well-known circuitry solutions, can be relatively liberally controlled and be either higher or lower than the band gap of the silicon. For these purposes the differential stage (DS) is used where the voltage power supply with negative temperature drift is connected...
At present, the sensor is widely used and its types are varied, such as biological sensor, gas sensor, humidity sensor, optical sensor, pressure sensor, etc. However, the performance of many sensors remains to be optimized. For instance, the problems of activity of the biofilm, detection range and sensitivity life in biosensor have limited the development of its own. On the other hand, in gas sensor,...
A resistor-less bandgap reference (BGR) for ultra-low power large-scale integrations (LSIs) is proposed in this paper. The BGR consists of a nano-ampere current reference circuit, a complementary-to-absolute-temperature (CTAT) voltage generator based on a diode connected MOSFET operating in subthreshold region, and a proportional-to-absolute-temperature (PTAT) voltage generator. A new topology that...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.