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.
The paper examines the influence of ozone pre-treatment of the bottom TiN electrode in a HfO2-based resistive switching metal-insulator-metal structure. The HfO2 layers with thicknesses 5.7, 4 and 3 nm were prepared by ozone assisted atomic layer deposition. Selected samples were pre-treated by ozone-only cycles prior to HfO2 deposition. Stable and reproducible bipolar resistive switching was obtained...
This study attempts to analyze a small-area silicon solar cell, which is designed for operation under medium concentration. By using the TCAD [1] tool and by adopting calibrated physical models, the front contact grid of the cell has been optimized to operate in the range from 100–200 suns. Furthermore, a comparison between different geometric grids has been discussed. The main figures of merit of...
The impact of post-deposition annealing of silicon based metal-insulator-semiconductor structures with SiO2/TiO2 dielectric layers is inspected by means of electrical characterisation. It is shown that annealing at 400 °C in the forming gas results into the photovoltaic response of MIS structure. Such behaviour is facilitated by the tunnelling of holes through SiO2. Annealing at higher temperature...
Amorphous silicon carbide films were prepared by PECVD technology on Si substrate with the aim to use SiC films in the technology of photoelectrochemical water splitting devices. Concentration of elements in the films was determined by RBS and ERD method. FTIR, Raman and I-V measurement were used before and after immersion of samples to aqueous sulfuric acid electrolyte. Differences between Raman...
We present results on single and mixed metal oxides based on NiO and TiO2 thin films which are able to detect 1000 ppm of hydrogen and to operate at 200°C. These films with thickness in the range of 50–100 nm were prepared by DC reactive magnetron sputtering on alumina and silicon substrates. The XRD measurements revealed polycrystalline character of annealed thin films at 600°C, whereas as-deposited...
Nickel oxide, NiO is a perspective metal oxide with the ability to detect hazardous and flammable gasses. The detection process is based on the change of the conductivity of the NiO layer upon the presence of the gas. To tune the sensing properties of NiO sensor, it is necessary to obtain more comprehensive understanding of current transport processes in the structure. In this paper, we present an...
We present a Pt film temperature element of the size of 1.5×1.5 mm2 with the meander width of 20 μm. It was investigated the effect of Pt film thickness prepared on alumina ceramics and the post-deposition annealing process on structural and electrical properties. As-deposited Pt films are polycrystalline with strongly preferred orientation on the (111) plane and the grains size is about 20 nm. The...
Analiza temperaturowych charakterystyk prądowo-napięciowych ogniw słonecznych pozwala na określenie zmian w wartościach podstawowych parametrów ogniwa: gęstości prądów nasycenia j0i zwarciowego jsc, napięcia rozwarcia Voc, współczynnika wypełnienia FF oraz sprawności konwersji η. Ponadto prezentowane wyniki umożliwiają porównanie charakterystyk ogniwa pracującego przy oświetleniu widmem AM 1.5 oraz...
Deep Level Transient Fourier Spectroscopy (DLTFS) experiments were realized to study emission and capture processes in InGaAsN multilayer solar cells grown on GaAs substrates by Atmospheric Pressure Metal Organic Vapor Phase Epitaxy (APMOVPE). As a referent structure for comparison purposes a basic GaAs p–n sample grown in the same system was also utilized. All the structures exhibited variety of...
Znajomość podstawowych parametrów modelu jednodiodowego ogniwa słonecznego pozwala na porównanie parametrów ogniw wytwarzanych różnymi technologiami. Ponadto, umożliwia symulowanie pracy ogniw słonecznych oraz analizowanie ich modeli zastępczych. W pracy omówiono właściwości funkcji specjalnej Lamberta W oraz przedstawiono jej wykorzystanie do wyznaczania parametrów jednodiodowego modelu zastępczego...
eLearning is an excellent tool for transfer of research results and latest findings into the educational process. This paper shows author's motivation and experience in design and realization of interactive eLearning course "Advanced Solar Cells". The course deals with the introduction and current status of photovoltaics, basic theory operation principle and fabrication process and application...
The paper deals with electrical characterization of nanocrystalline diamond / p- type crystalline silicon heterostructures. The diamond films were prepared with and without nitrogen addition into CH4/CO2/H2 gas mixture during the deposition. The introduced nitrogen promoted amorphization instead of creating sp2 domains. The structure with nitrogen exhibits shallow donor state with energy of 0.28 eV...
Numerical modeling and simulation provide an efficient tool for analysis and optimization of device structure design. In this paper we present a method for the design of solar cell. Three methodologies for fully coupled rigorous electro-physical and optical simulation of solar cell are proposed. The first one is based on full 3-D modeling employing TCAD tools applied to a simple solar cell. The second...
We present a new model of two coupled defect-level recombination. Calculation of the generation and recombination rates is based on the so-called exchange times. These allow calculating the occupation probability of the trapping centres and subsequently the generation-recombination rates of free charge carriers appearing in the continuity equations. Each of these two coupled defect levels has its...
We investigate the impact of interface traps and bulk traps on the performance of n++GaN/InAlN/AlN/GaN high electron mobility transistors (HEMTs) using two-dimensional Sentaurus TCAD simulation. The device uses lattice-matched wide bandgap In0.17Al0.83N as a thin barrier layer. The simulations are performed using the thermodynamic transport model. Interface and bulk traps are accounted for in our...
Tandem (two p-n junctions connected by tunnel junction) and multijunction solar cells (MJSCs) based on AIIIBV semiconductor compounds and alloys are the most effective photovoltaic devices. Record efficiency of the MJSCs exceeds 44% under concentrated sunlight. Individual subcells connected in series by tunnel junctions are crucial components of these devices. In this paper we present atmospheric...
Wielozłączowe ogniwa słoneczne na bazie półprzewodników złożonych AIIIBV należą do najbardziej wydajnych przyrządów fotowoltaicznych. Sprawność konwersji takich ogniw przekracza 40% przy zastosowaniu skoncentrowanego promieniowania słonecznego. Ważnymi elementami w konstrukcji takiego przyrządu są poszczególne podogniwa wykonane z różnych materiałów półprzewodnikowych. W niniejszej pracy przedstawiono...
A study of the effect of technology parameters (sputtering power, substrate temperature and post-deposition annealing) on structural, electrical and optical properties of aluminium-doped zinc oxide (AZO) thin films was carried out. The optimal technology parameters of preparation were found to get necessary properties of AZO thin films for application in solar cells - the high figure of merit (F ges...
This paper presents investigations on droplet and particle manipulation in microfiuidic channels realized in SU-8/glass technology, which is based on a competitive interplay of viscous drag, gravitational, buoyancy and dielectrophoretic forces. The latter are induced by alternating current (AC) driven three-dimensional (3D) stepped electrode arrays in the channel, enabling so called 3D AC electro-osmotic...
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.