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    Wyświetlanie 1-8 z 8
    Tytuł:
    Space Charge Limited Currents in Anthracene Crystals under Modulated Illumination
    Autorzy:
    Uzarczyk, A.
    Godlewski, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1933388.pdf
    Data publikacji:
    1995-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    72.40.+w
    Opis:
    Space charge limited currents have been examined in anthracene crystals illuminated with a chopped beam of monochromatic light (λ = 420 nm). The beam was uniformly absorbed in the anthracene crystal. The primary objective of our research was to determine mechanisms responsible for the release and trapping of charge carriers in the case of space charge limited currents as a function of time. The experimental results concern the dependences of photocurrents on the frequency of light chopping, light intensity, voltage and current decay after illumination. Photocurrent decay as a function of time was exponential for short time periods (i.e. for milliseconds), while for longer periods it was described by the power function t$\text{}^{-1/l}$, where parameter 1 is the characteristic parameter of the exponential distribution of traps.
    Źródło:
    Acta Physica Polonica A; 1995, 87, 4-5; 849-854
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    An analysis of solar energy conversion systems based on photon and thermal processes
    Autorzy:
    Fieducik, J.
    Godlewski, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/184520.pdf
    Data publikacji:
    2016
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
    Tematy:
    energy conversion
    photoelectric effect
    thermoelectric process
    thermionic emission process
    Opis:
    Solar spectral irradiance covers a fairly broad wavelength range. Solar radiation is part of the electromagnetic spectrum which is described by the concept of wave-particle duality. The corpuscular theory of electromagnetic radiation states that energy is transmitted by photons. Photons carry specific amounts of energy which can be used to convert solar energy into other types of energy, in particular electricity. The internal photoelectric effect is important for the conversion of solar energy to electricity because the efficiency of the external photoelectric effect is too low. Every quantum of solar energy also carries a certain amount of energy which can be converted into heat energy. The objective of the paper is to analyze and compare the efficiency of solar energy conversion in photon and thermal processes, to review the technological advances made in this field, and to indicate potential directions for the development of systems converting solar energy to electricity.
    Źródło:
    Geology, Geophysics and Environment; 2016, 42, 4; 403-409
    2299-8004
    2353-0790
    Pojawia się w:
    Geology, Geophysics and Environment
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The distribution and chemical coding of urinary bladder trigone-projecting neurons in testicular and aorticorenal ganglia in male pigs
    Autorzy:
    Pidsudko, Z.
    Godlewski, J.
    Wąsowicz, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/16539341.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czasopisma i Monografie PAN
    Tematy:
    prevertebral ganglia
    urinary bladder trigone
    immunohistochemistry
    retrograde tracing
    neuropeptides
    male pig
    Opis:
    Combined retrograde tracing and double-labelling immunofluorescence were used to investigate the distribution and chemical coding of neurons in testicular (TG) and aorticoerenal (ARG) ganglia supplying the urinary bladder trigone (UBT) in juvenile male pigs (n=4, 12 kg. of body weight). Retrograde fluorescent tracer Fast Blue (FB) was injected into the wall of the bladder trigone under pentobarbital anesthesia. After three weeks all the pigs were deeply anesthetized and transcardially perfused with 4% buffered paraformaldehyde. TG and ARG, were collected and processed for double-labelling immunofluorescence. The expression of tyrosine hydroxylase (TH) or dopamine beta-hydroxylase (DBH), neuropeptide Y (NPY), somatostatin (SOM), galanin (GAL), nitric oxide synthase (NOS) and vesicular acetylcholine transporter (VAChT) were investigated. The cryostat sections were examined with a Zeiss LSM 710 confocal microscope equipped with adequate filter blocks. The TG and ARG were found to contain many FB-positive neurons projecting to the UBT (UBT-PN). The UBT-PN were distributed in both TG and ARG. The majority of them were found in the right ganglia, mostly in TG. Immunohistochemistry disclosed that the vast majority of UBT-PN were noradrenergic (TH- and/or DBH-positive). Many noradrenergic neurons contained also immunoreactivity to NPY, SOM or GAL. Most of the UBT-PN were supplied with VAChT-, or NOS- IR (immunoreactive) varicose nerve fibres. This study has revealed a relatively large population of differently coded prevertebral neurons projecting to the porcine urinary bladder. As judged from their neurochemical organization these nerve cells constitute an important element of the complex neuro-endocrine system involved in the regulation of the porcine urogenital organ function.
    Źródło:
    Polish Journal of Veterinary Sciences; 2022, 25, 3; 483-487
    1505-1773
    Pojawia się w:
    Polish Journal of Veterinary Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Electric Current Flow through Tetracene Layer-Anthracene Crystal Junction
    Autorzy:
    Signerski, R.
    Godlewski, J.
    Sodolski, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/1933385.pdf
    Data publikacji:
    1995-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    72.40.+w
    Opis:
    Theoretical and experimental analysis was carried out on electric currents limited by the potential barrier governing the flow of holes from the tetracene layer to the anthracene crystal. Theoretical spatial distributions of charge carriers near the barrier were determined, as well as current-field dependences for the currents flowing through the investigated junction in the presence and in the absence of illumination. A current-field characteristic of the junction conditioned current is described by dependence of the j ∝ E$\text{}_{0}^{3}$ type in the presence of illumination and by the j ∝ E$\text{}_{0}^{2l+1}$ type in the lack of illumination, where l is the characteristic parameter of the trap distribution. Experimental research of the hole currents flowing through the polycrystalline tetracene layer-anthracene monocrystal junction confirmed the theoretical predictions about the current-field characteristics. A remarkably unequivocal confirmation was obtained for the current-field dependences in the presence of illumination.
    Źródło:
    Acta Physica Polonica A; 1995, 87, 4-5; 843-847
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Numerical Analysis of Photoenhanced Electric Currents in Molecular Materials
    Autorzy:
    Jarosz, G.
    Signerski, R.
    Godlewski, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1933390.pdf
    Data publikacji:
    1995-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    72.40.+w
    Opis:
    This paper presents numerical calculations of photoenhanced current-applied voltage and photoenhanced current-light intensity characteristics with regard to the exciton diffusion length, lifetime of excitons and rate of exciton surface quenching. Dependencies of this type cannot be obtained analytically. It is shown that the increase in diffusion length causes the decrease in current in the case of strong surface quenching of excitons. Simultaneously, it is shown that the quality of crystals influences the photoenhanced current. A better quality of crystals causes the increase in the current in the case of weak surface quenching of excitons.
    Źródło:
    Acta Physica Polonica A; 1995, 87, 4-5; 855-860
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Struktury fotowoltaiczne z planarnym heterozłączem półprzewodnik II-VI / półprzewodnik molekularny
    Photovoltaic Devices Based on Planar II-VI Semiconductor / Molecular Semiconductor Heterojunction
    Autorzy:
    Signerski, R.
    Jarosz, G.
    Szostak, J.
    Godlewski, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/159630.pdf
    Data publikacji:
    2014
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Elektrotechniki
    Tematy:
    efekt fotowoltaiczny
    ogniwa hybrydowe
    photovoltaic effect
    hybrid solar cells
    Opis:
    Artykuł przedstawia wybrane wyniki badań własnych nad układami hybrydowymi zbudowanymi na bazie złącza półprzewodnik nieorganiczny II-VI / półprzewodnik organiczny. Na podstawie analizy położenia pasm energetycznych warstw wchodzących w skład wytworzonych ogniw oraz charakterystyk spektralnych prądu zwarcia tych urządzeń, określone zostały procesy prowadzące do fotogeneracji nośników ładunku w badanych układach. W ogniwach zbudowanych na bazie złącz CdS/ZnPc oraz ZnTe/F16ZnPc zaobserwowano zarówno generację bezpośrednią w półprzewodniku nieorganicznym (przejście pasmo-pasmo), jak i generację wynikającą z dysocjacji ekscytonów wzbudzonych w półprzewodniku molekularnym, zachodzącą na złączu obydwu półprzewodników. W przypadku układów zbudowanych na bazie złącza CdTe/DIP, zaobserwowano jedynie fotogenerację drugiego typu.
    This article presents chosen results of research on hybrid solar cells based on inorganic II-VI semiconductor/molecular semiconductor heterojunctions. On the basis of energetic structure of fabricated devices and short-circuit current spectral response measured for these cells possible processes leading to photogeneration of free charge carriers were determined. For the cells based on CdS/ZnPc and ZnTe/F16ZnPc heterojunctions two processes were identified: direct photogeneretaion in inorganic semiconductors via band-to-band transitions and dissociation of excitons generated in molecular semiconductors that takes place at the interface of both semiconductors forming the junction. In contrast, only the latter process was observed in case of devices with CdTe/DIP heterojunction.
    Źródło:
    Prace Instytutu Elektrotechniki; 2014, 264; 91-98
    0032-6216
    Pojawia się w:
    Prace Instytutu Elektrotechniki
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Charge Carrier Generation Caused by X-Rays in Organometallic Materials
    Autorzy:
    Godlewski, J.
    Signerski, R.
    Jarosz, G.
    Stizza, S.
    Berrettoni, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/2011031.pdf
    Data publikacji:
    1999-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    72.40.+w
    Opis:
    Organometallic compounds play an exceptional role among organic compounds. Due to their structure a number of these compounds demonstrate interesting properties in various phenomena. Organometallic compounds show special properties in the case of X-ray absorption owing to considerable differences between the absorption coefficients of metals and light elements. The analysis of processes of charge carrier generation as a result of X-ray absorption in chosen organometallic compounds is the subject of this paper. Spectral dependences of charge carrier photogeneration efficiency around the Cu K-edge in copper phthalocyanine and copper acetylacetoniane have been specially considered. It has been observed that the photocurrent spectrum in these materials follows the absorption spectrum but mutual relation is not directly proportional. Experimental results connected with current-voltage and current-intensity characteristics have been analysed, as well. The obtained relationships have been compared with adequate results connected with charge carrier photogeneration in visible area and UV in organic materials. It has been observed that the X-ray photogeneration of charge carriers in the examined range of energy differs from the mechanisms of charge carrier generation in visible area and UV. The basic differences arise from the participation of secondary electrons, which are generated due to Auger electrons, Compton effect, and metal fluorescence. The process of charge carrier generation as a result of X-rays absorption is characterized by strong recombination of charge carriers in channels in which charge carriers are generated by high energetic secondary electrons.
    Źródło:
    Acta Physica Polonica A; 1999, 96, 2; 295-301
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Jedno- i dwuwarstwowe organiczne ogniwa fotowoltaiczne
    Single and Double-Layer Organic Solar Cells
    Autorzy:
    Godlewski, J.
    Signerski, R.
    Jarosz, G.
    Obarowska, M.
    Szostak, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/160223.pdf
    Data publikacji:
    2014
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Elektrotechniki
    Tematy:
    fotowoltaika
    materiały organiczne
    photovoltaics
    organic materials
    Opis:
    Omówiona została zasada działania organicznych ogniw fotowoltaicznych na przykładzie ogniw jedno- i dwuwarstwowych. Przedstawione zostały procesy prowadzące do fotogeneracji swobodnych nośników ładunku w układach organicznych, ze szczególnym uwzględnieniem procesu dyfuzji oraz dysocjacji ekscytonu na złączu dwóch materiałów. Przytoczone zostały podstawowe wyrażenia na wartość napięcia fotowoltaicznego dla układów jedno- i dwuwarstwowych oraz wybrane wyniki badań własnych dla ogniw dwuwarstwowych.
    This article explains operational principles of organic solar cells for one-layer and bilayer planar devices. A short description of processes leading to photogeneration of free charge carriers, with special emphasis on exciton diffusion to a junction of two materials followed by exciton dissociation at this junction is given. Basic equations for photovoltage obtained for one- and bilayer devices are presented. Moreover, chosen results of research run by our group for bilayer planar solar cells are shown.
    Źródło:
    Prace Instytutu Elektrotechniki; 2014, 264; 81-90
    0032-6216
    Pojawia się w:
    Prace Instytutu Elektrotechniki
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-8 z 8

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