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Tytuł:
Effect of substrate temperature on the optical and structural properties of CdS nano particles
Wpływ temperatury podłoża na właściwości optyczne i strukturalne nanocząstek CdS
Autorzy:
Qassim, Barzan Kh.
Uonis, Mohammad M.
Khaleel, Erada A.
Powiązania:
https://bibliotekanauki.pl/articles/41152375.pdf
Data publikacji:
2023
Wydawca:
Wydawnictwo SIGMA-NOT
Tematy:
CdS thin films
optical properties of CdS
chemical spray pyrolysis
CdS nanoparticles
cienkie warstwy CdS
właściwości optyczne CdS
chemiczna piroliza natryskowa
nanocząstki CdS
Opis:
Thin films of CdS have been deposited on glass substrates using the chemical spray pyrolysis method at different substrate temperatures of 100°C, 150°C, 200°C, and 250°C to investigate the optimum temperature to prepare CdS particles with nano dimensions. The CdS thin film was examined using SEM, X-ray spectrum analysis, and UV-visible spectrophotometry. The SEM images and X-ray spectra were used to estimate the structural features and grain size of the films. The optical properties and optical constants also varied clearly with temperature. In addition, the energy gap changed with temperature from 2.1 eV to 2.55 eV.
Wpływ temperatury podłoża na właściwości optyczne i strukturalne nanocząstek CdS Cienkie warstwy CdS zostały osadzone na szklanych podłożach metodą chemicznej pirolizy natryskowej w temperaturach podłoża wynoszących 100°C, 150°C, 200°C i 250°C w celu określenia optymalnej temperatury do przygotowania cząstek CdS o wymiarach nano. Tak przygotowane próbki zostały zbadane za pomocą SEM i spektrofotometrii UV-VIS, przeprowadzono także analizę widma rentgenowskiego. Obrazy SEM i widma rentgenowskie zostały wykorzystane do oszacowania cech strukturalnych i wielkości ziarna warstw. Właściwości optyczne i stałe optyczne zmieniały się wyraźnie wraz ze zmianą temperatury. Przerwa energetyczna wynosiła w zależności od temperatury od 2,1 eV do 2,55 eV.
Źródło:
Ochrona przed Korozją; 2023, 11; 354-357
0473-7733
2449-9501
Pojawia się w:
Ochrona przed Korozją
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Quantum dots for temperature sensing
Autorzy:
Doskaliuk, Natalia
Lukan, Yuliana
Khalavka, Yuriy
Powiązania:
https://bibliotekanauki.pl/articles/35139207.pdf
Data publikacji:
2023
Wydawca:
Radomskie Towarzystwo Naukowe
Tematy:
quantum dots
photoluminescence
thermal sensing
temperature sensitivity
II-VI semiconductors
I-III-VI semiconductors
CdTe
CdS
PbS
AgInS2
CuInS2
kropki kwantowe
fotoluminescencja
detekcja ciepła
wrażliwość termiczna
półprzewodniki II-VI
półprzewodniki I-III-VI
Opis:
Quantum dots are three-dimensional nanoparticles of semiconductors with typical sizes ranging from 2 to 10 nm. Due to the quantum confinement effect the energy gap increase with the size decreasing resulting in size-depended and fine-tunable optical characteristics. Besides this, the energy structure of a quantum dot with a certain size is highly sensitive to environmental conditions. These specific properties open a wide range of applications starting from optical and optoelectronic devices and ending with biosensing and life science. Temperature is one of those parameters influencing strongly on the optical properties of semiconductor nanocrystals, which make them promising materials for temperature sensing, more often using a fluorescent response. Compared to the conventional organic dyes already applied in this field, quantum dots exhibit a set of advantages, such as high quantum yield and photostability, long fluorescence lifetime, higher Stokes shift, and ability to surface functionalization with targeted organic molecules aimed to provide them biocompatibility. In this review, we briefly discuss the properties of II-VI and assumingly less toxic I-III-VI quantum dots, mechanisms of temperature-induced fluorescence response, and the feasibility of their practical application in the field of thermal sensing.
Źródło:
Scientiae Radices; 2023, 2, 2; 93-111
2956-4808
Pojawia się w:
Scientiae Radices
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Development of chalcogenide solar cells : importance of CdS window layer
Autorzy:
Lilhare, D.
Khare, A.
Powiązania:
https://bibliotekanauki.pl/articles/1818222.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Stowarzyszenie Elektryków Polskich
Tematy:
CdS
CdTe
photovoltaics
window layer
thin films
Opis:
The solar photovoltaic technology is one of the renewable technologies with the potential to shape a future-proof, reliable, scalable and affordable electricity system. It is important to provide better resources for any upcoming technology. CdS/CdTe thin films have long been considered as one enticing option for reliable and cost-effective solar cells to be developed. N-type CdS as a transparent window layer in heterojunction structures is one of the best choices for CdTe cells. In a solar cell structure, window layer material plays a very crucial role to improve its performance. For this reason, this review focuses on the basic and significant aspects such as importance of the window layer thickness, degradation effect, use of nano-wire arrays, and an ammonia-free process to deposit the window layer. Also, an attempt has been made to analyze various processes improving window layer properties. Necessary discussions have been included to review the impact of solar cell parameters on the above aspects. It is anticipated that this review article will fulfill the requirement of knowledge to be used in the fabrication of CdS/CdTe solar cells.
Źródło:
Opto-Electronics Review; 2020, 28, 1; 43--63
1230-3402
Pojawia się w:
Opto-Electronics Review
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Sovereign credit ratings and CDS spreads in Emerging Europe
Autorzy:
Dopierała, Łukasz
Ilczuk, Daria
Wojciechowski, Liwiusz
Powiązania:
https://bibliotekanauki.pl/articles/22444414.pdf
Data publikacji:
2020
Wydawca:
Instytut Badań Gospodarczych
Tematy:
credit rating agencies
Emerging Europe
CDS
event study
Opis:
Research background: Sovereign credit ratings play an important role in determining any country?s access to the international debt market. During the global financial crisis and the European debt crisis, credit rating agencies were harshly criticized for the timing of their announcements regarding ratings downgrades and the ranges of those downgrades. Therefore, it is worth considering whether the sovereign credit rating is still a useful benchmark for investors. Purpose of the article: This article examines whether credit rating agencies still provide financial markets with new information about the solvency of governments in Emerging Europe countries. In addition, it describes the differences in the effect of particular types of rating events on financial markets and the impact of individual agencies on the market situation. Our study also focuses on evaluating these occurrences at different stages of the business cycle. Methods: This article uses data about ratings events that took place between 2008 and 2018 in 17 Emerging Europe economies. We took into consideration positive, neutral, and negative events related to ratings changes and the outlooks reported by Fitch Ratings, Moody?s, and Standard & Poor?s. We used a methodology based on event studies. In addition, we performed Wilcoxon signed-ranks test and used a logit model to determine the usefulness of cumulative adjusted credit default swap (CDS) spread changes in predicting the direction of ratings changes. Findings & Value added: Our research provides evidence that the CDS market reflects information regarding government issuers up to three months before ratings downgrades are announced. Information reported to the market by ratings agencies is only relevant in the short timeframe surrounding ratings downgrades and upgrades. However, positive credit rating changes convey more information to the market. We also found strong evidence that, in the post-crisis period, credit ratings provide markets with less information.
Źródło:
Equilibrium. Quarterly Journal of Economics and Economic Policy; 2020, 15, 3; 419-438
1689-765X
2353-3293
Pojawia się w:
Equilibrium. Quarterly Journal of Economics and Economic Policy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of Time Immersion of Thiourea on Structural and Optical Properties of CdS Deposited by SILAR
Autorzy:
Raid, A. Ismail
Nadir, F. Habubi
Kameran, Y. Qader
Powiązania:
https://bibliotekanauki.pl/articles/1178249.pdf
Data publikacji:
2018
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
CdS
Optical Properties
SILAR
Opis:
Successive ionic layer adsorption and reaction (SILAR) technique was used to prepare (CdS) thin films on glass substrate, by changing the immersion time in thiourea solution. XRD patterns proved that the as deposited thin films were polycrystalline structure with an average crystallite size ranging from 14.1 nm to 5.6 nm depending on immersion time. The EDX confirm the existence of CdS. Scanning electron microscopy reveals that the deposited films have a nanorod structure.Atomic force microscopy has shown that the values of average roughness and the root mean square roughness increase upon increasing the immersion time. The transmittance spectra reveal that as the immersion time increase, the value of transmittance decrease.
Źródło:
World Scientific News; 2018, 91; 73-85
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Premia na rynku kontraktów CDS a koniunktura na rynku akcji w Polsce w okresie 2011–2016
Credit Default Swap Premia vs. the Polish Stock Market in the Period 2011-2016
Autorzy:
Feder-Sempach, Ewa
Powiązania:
https://bibliotekanauki.pl/articles/595815.pdf
Data publikacji:
2018
Wydawca:
Łódzkie Towarzystwo Naukowe
Tematy:
risk, CDS premia, stock index
Opis:
This article proposes a simple approach to explain credit default swap premia and stock market prices in Poland. Credit Default Swap is an innovative financial instrument designed to transfer risk. Sovereign CDS premia measure investment risk. The aim of the article is to compare the premia of five-year Polish sovereign CDS and the Polish stock market indices – the WIG (Warsaw Stock Exchange Index) and the NCI (NewConnect Index). The key aim of the study is to calculate the Pearson correlation coefficient of premia with indices in the period 2011-2016. According to the theory, the CDS premia were strongly negatively correlated with the main index of the Polish stock market. When the premia increase, the WIG decreases simultaneously, and vice versa. However, in the case of CDS premia and the NCI, a strong positive correlation was documented. When the premia increase, the same is true for the NC index. The relationship can be explained by the presence of low risk-averse investors on the NewConnect market.
Credit Default Swap to innowacyjny instrument finansowy umożliwiający transfer ryzyka. Premia kontraktów CDS typu sovereign jest postrzegana jako miernik ryzyka inwestycyjnego kraju. Celem artykułu jest porównanie premii pięcioletniego kontraktu CDS wystawionego na polskie obligacje z koniunkturą na rynku akcji mierzoną za pomocą indeksu WIG i NCI. Przedmiotem badania jest korelacja premii z indeksami w okresie 2011–2016. Zgodnie z teorią premia CDS była silnie ujemnie skorelowana z głównym indeksem rynku akcji w Polsce WIG. Wzrost premii powodował spadek wartości oraz stopy zwrotu z indeksu WIG i vice versa. Odwrotne wyniki uzyskano w przypadku indeksu NCI, silna korelacja dodatnia. Wzrost premii CDS powoduje wzrost indeksu NCI, a spadek premii CDS spadek indeksu. Nie potwierdza tej relacji porównanie premii CDS i stopy zwrotu z NCI, gdzie wystąpiła niewyraźna korelacja ujemna. Zależność można wytłumaczyć obecnością na rynku alternatywnym inwestorów o niskim poziomie awersji do ryzyka, dla których wzrost ryzyka kraju to okazja do zwiększania zysku i większe zaangażowanie na NewConnect.
Źródło:
Studia Prawno-Ekonomiczne; 2018, 107; 239-252
0081-6841
Pojawia się w:
Studia Prawno-Ekonomiczne
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Urbach energy and dispersion parameters of CdS chemically deposited thin films on the effect of thickness
Autorzy:
Hadi, Ahmed Hussin
Powiązania:
https://bibliotekanauki.pl/articles/1177946.pdf
Data publikacji:
2018
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
CdS thin film
Dispersion parameters
Urbach energy
chemical spray pyrolysis
Opis:
Optical transmittance spectra of CdS thin films were recorded from UV-Visible spectrophotometer in the range 380-900 nm. The films were prepared by chemical spray pyrolysis by spraying an aqueous solution of cadmium chloride (CdCl2) and thiourea [(NH2)2CS] with de-ionized water. UV-Visible spectrophotometer used to recording the transmittance spectra in the range of 380-900 nm. The transmittance decreased with the increasing of CdS film thickness, while the reflectance increases. The energy gap decreased with the increasing of film thickness, while Urbach energy increased. Dispersion parameters such as; Ed, Eo, ε∞, n(0), So, λo, M-1, and M-3 are studied.
Źródło:
World Scientific News; 2018, 97; 241-249
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Badania nad technologią otrzymywania cienkich warstw emitera metodą rozpylania magnetronowego dla zastosowań w ogniwach CIGS
Research on the technology of obtaining thin layers of emitter in CIGS photovoltaic cells by using magnetron sputtering process
Autorzy:
Pietraszek, J.
Gułkowski, S.
Powiązania:
https://bibliotekanauki.pl/articles/105005.pdf
Data publikacji:
2017
Wydawca:
Politechnika Rzeszowska im. Ignacego Łukasiewicza. Oficyna Wydawnicza
Tematy:
CIGS
CdS
warstwa buforowa
ogniwa fotowoltaiczne
kąpiel chemiczna
CBD
rozpylanie magnetronowe
ogniwa cienkowarstwowe
buffer layer
photovoltaic cells
chemical bath deposition
magnetron sputtering
thin film cell
Opis:
Cienkowarstwowe ogniwa fotowoltaiczne wykonane na bazie struktury CIGS (mieszaniny pierwiastków miedzi, indu, galu oraz selenu) należą do II generacji ogniw fotowoltaicznych. Wykazują one efektywność na poziomie zbliżonym do ogniw I generacji, lecz ze względu na niższe zużycie materiału, coraz częściej wypierają z rynku ogniwa krzemowe Artykuł przedstawia rezultaty badań dotyczących sposobu otrzymywania warstwy buforowej CdS (siarczku kadmu), zastosowanej w cienkowarstwowych ogniwach fotowoltaicznych typu CIGS. Przyjęto dwa rozwiązania technologii nanoszenia: warstwa okna CdS uzyskana metodą rozpylenia magnetronowego oraz warstwa okna CdS uzyskana metodą kąpieli chemicznej (CBD– Chemical Bath Deposition). Struktura ta powinna posiadać odpowiednią wielkość przerwy energetycznej, która pozwali na większą absorpcję fotonów, a także wymaga się, aby była cienka (mniej niż 100 nm) i jednolita. Warstwy CdS zostały nałożone przez osadzanie w kąpieli chemicznej CBD na szklanych podłożach pokrytych Mo/CIGS (naniesione warstwy metodą sputteringu magnetronowego). Uzyskano dzięki temu warstwę emitera o grubości 80 nm po czasie osadzania 35 minut. Dla porównania warstwy CdS zostały nałożone poprzez sputtering magnetronowy na podłożu Mo/CIGS, uzyskanym tą samą metodą. Następnie oba rozwiązania zostały przebadane pod względem morfologii powierzchni na elektronowym mikroskopie skaningowym, jak również przeprowadzono analizy składu pierwiastkowego warstw. Zarówno jedna, jak i druga metoda prowadzi do otrzymania warstwy emitera CdS dla zastosowań w ogniwach CIGS.
Thin-film photovoltaic cells created based on the structure of CIGS (a mixture of the elements copper, indium, gallium and selenium) belong to the second generation of photovoltaic cells. They show the effectiveness of a level similar to the cells of the first generation, but due to lower material consumption, they increasingly forcing out silicon solar cells. The article presents the results of research of the method for obtaining a CdS buffer layer, used in thin-film CIGS photovoltaic cells. Two technology solutions of application were adopted: layer of CdS window obtained by the magnetron sputtering and layer of CdS obtained by chemical method (CBD- Chemical Bath Deposition). CdS layer has been imposed by the deposition in the chemical bath on glass substrates covered with Mo/CIGS (layers applied by magnetron sputtering). Allowing an emitter layer having a thickness of 80 cm after 35 minutes of deposition time. For comparison, a CdS layer was applied by magnetron sputtering on the substrate Mo/CIGS obtained by the same method. Subsequently, both solutions were examined in the SEM microscope to check the surface morphology, and also to analysis the elemental composition of the layers. Both methods leads to receive CdS emitter layer for use in CIGS cells.
Źródło:
Czasopismo Inżynierii Lądowej, Środowiska i Architektury; 2017, 64, 1; 173-180
2300-5130
2300-8903
Pojawia się w:
Czasopismo Inżynierii Lądowej, Środowiska i Architektury
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Facile Synthesis and Characterization of Novel CdS/BiOI Heterojunctions with Enhanced Visible-Light Photocatalytic Performances
Autorzy:
Fang, Shanshan
Lu, Min
Zhou, Man
Li, Zhongyu
Xu, Song
Peng, Yanyan
Li, Qinchi
Lu, Dayong
Powiązania:
https://bibliotekanauki.pl/articles/1030343.pdf
Data publikacji:
2017-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
CdS/BiOI heterojunctions
visible-light photocatalyst
photocatalytic activity
nanocomposites
Opis:
Novel CdS/BiOI heterojunction photocatalysts were successfully prepared by facile method. The as-prepared samples were characterized by transmission electron microscopy, field-emission scanning electron microscopy, X-ray diffraction, the Raman spectroscopy, UV-vis diffuse reflectance spectra, the Fourier transform infrared spectra, and photoluminescence. It was found that CdS nanoparticles were uniformly distributed on the surface of BiOI microspheres. The photodegradation tests showed that the photocatalytic efficiency was increased at first and then decreased when further increasing CdS content in the nanocomposites. The highest activity was obtained by 3%-CdS/BiOI nanocomposites. The enhanced photocatalytic performances were attributed to the matched band potentials of CdS and BiOI, which resulted in the efficient separation of photogenerated electron-hole pairs. Based on the experimental results, a reasonable photocatalytic mechanism of CdS/BiOI photocatalysts was also proposed.
Źródło:
Acta Physica Polonica A; 2017, 131, 2; 263-270
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Structural and optical properties of nanocrystalline CdS films prepared by spray pyrolysis
Autorzy:
Aljarrah, Radhyah M. S.
Aljobory, Adnan H.
Powiązania:
https://bibliotekanauki.pl/articles/1179009.pdf
Data publikacji:
2017
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Cadmium Sulphide
CdS films
spray pyrolysis
Opis:
Cadmium Sulphide (CdS) thin films are produced using spray pyrolysis deposition technique. Films are annealed in air at 400, 500, and 600 K of 1 h. It characterized by X-Ray Diffraction (XRD), Atomic Force Microscope (AFM) and optical properties of CdS. XRD shows that these films are polycrystalline in nature with cubic and hexagonal crystalline structure. The crystallite size, microstrain, and dislocation density were measured. AFM shows that the total substrate surface is finely covered with uniformly distributed spherical shaped grains. Optical transmittance was shown that direct transition with band gap energy was decreased between 2.44 to 2.27 eV with annealing.
Źródło:
World Scientific News; 2017, 87; 175-190
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Impact Of The Ban On Uncovered SCDS Trade On the Interdependencies Between The CDS Market And Other Sectors Of Financial Markets. The Case Of Safe And Developed Versus Risky And Developing European Markets
Autorzy:
Kliber, Agata
Powiązania:
https://bibliotekanauki.pl/articles/632986.pdf
Data publikacji:
2016-03-01
Wydawca:
Uniwersytet Łódzki. Wydawnictwo Uniwersytetu Łódzkiego
Tematy:
sovereign CDS (sCDS)
bonds
exchange rate
stock exchange
volatility
financial crisis.
Opis:
The aim of the article is to verify the impact of the ban on uncovered sCDS trade in Europe on the interdependencies between the sCDS market and other sectors of financial markets. We analyse two European markets: the safe and developed Swedish market, and the risky and developing Hungarian one. The study covers the period from October 2008 to October 2013. We analyse changes in the interdependencies between the sCDS market and the bond market, as well as between the sCDS market and the stock exchange. We found out that in the case of the safe Swedish market, the strength of relationships of each sector of financial markets with the sCDS one was much weaker than in the case of Hungary, which may suggest that the Swedish market is less prone to crisis transmission arising from herd behaviour or speculative attacks. In the end we show that in the two economies, the influence of the sCDS market on the other sectors of financial market indeed diminished following introduction of the ban on uncovered sCDS trade.
Źródło:
Comparative Economic Research. Central and Eastern Europe; 2016, 19, 1; 77-99
1508-2008
2082-6737
Pojawia się w:
Comparative Economic Research. Central and Eastern Europe
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The impact of Cu alloy on auxiliary and invisible options of splash kept CdS slims
Autorzy:
Kadhim, Mohammed A.
Powiązania:
https://bibliotekanauki.pl/articles/1188099.pdf
Data publikacji:
2016
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
CdS
spray pyrolysis
optical properties
Cu concentration
Opis:
Cadmium Sulfide and copper alloyed Cd1-xS Cux slims have been set up by the spray pyrolysis technique. The optical gap crevices at unadulterated and doped Cadmium Sulfide were observed to be shifted from (2.34 to 2.45) eV with increment x from (0 to 0.1). The X-beam diffraction (XRD) investigation uncovered that slims were polycrystalline and showed two phases cubic and hexagonal structure with increasing the hexagonal phase with increment Cu ratio.
Źródło:
World Scientific News; 2016, 56; 217-228
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A mechatronic project device to play CDs
Autorzy:
Ciesielka, W.
Chmielowski, Ł.
Powiązania:
https://bibliotekanauki.pl/articles/114593.pdf
Data publikacji:
2015
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
mechatronic project
sound control system
device to play CDs
Opis:
In this paper an autonomous device for playing CDs is presented. The work was divided into two fundamental stages. In the first – the preliminary one – a broad analysis of the structure and the operating principles of these players was carried out. In the second stage, the mechanical, electronic and software parts of the CD player were designed and made. Catia V5R15 software was used for the realization of the mechanical part. Printed circuits were designed and made with the help of Protel program. The essential analyses and simulations were performed in Protel, too. The software part included development of the algorithms and realization of the device control program and was made using AVR GCC compiler. In the final stage, verification of the device correctness was made by taking electrical measurements and performing audio monitoring tests.
Źródło:
Measurement Automation Monitoring; 2015, 61, 4; 118-121
2450-2855
Pojawia się w:
Measurement Automation Monitoring
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Improved photoresponse of porous silicon photodetectors by embedding CdS nanoparticles
Autorzy:
Abd, Ahmed N.
Powiązania:
https://bibliotekanauki.pl/articles/1193949.pdf
Data publikacji:
2015
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
CdS
Nanoparticles
PSi
Photodetector
SEM
XRD
Opis:
In this research, the nanocrystalline porous silicon (PSi) films are prepared by electrochemical etching of p types silicon wafers with 15 mA/cm2 etching current densities and 15 min etching time on the formation nanosized pore array. PSi was characterized by the measurement of XRD, FTIR spectroscopy and atomic force microscopy properties (AFM). We have estimated crystallites size from X-Ray diffraction about nanoscale for PSi and Atomic Force microscopy confirms the nanometric size Chemical fictionalization during the electrochemical etching show on the surface chemical composition of PSi. The atomic force microscopy investigation shows the rough silicon surface. Also, it is reported the preparation of colloidal CdS nanoparticles NPs prepared by laser ablation in liquid (LAL) technique by irradiating with a Nd:YAG laser pulses CdS target immersed in methanol and varying the laser fluence 1.32 J/cm2. The structural, morphological and optical of CdS NPs has been studied. XRD measurement disclosed that the CdS NPs were of wurtzite hexagonal crystal structure. Transmission electron microscopy (TEM) investigation revealed that the synthesized CdS particles are spherical and have an average particle size in the range of (25 nm). AFM investigations showed that the produced CdS particles have ball-shape with good disposability. The energy band gap of CdS NPs prepared with 1.32 J/cm2 laser fluence has been determined from optical properties and found to be in the range (2.9 eV). Optical constants of CdS NPs were determined from transmittance and reflectance spectra.The effect of CdS NPs diffusion on properties of PSi Photodetector have reported which reveals that improving in (Al/PSi/Si/Al). The results show that a linear relationship between 1/C2 and reverse bias voltage was obtained. The built-in potential have values depending on the etching time current density and laser flunce. Al/CdSe/PSi/Si/Al photodetector hetrojunction have two peaks of response located at 415 nm and (700 -800nm) with max sensitivity 0.6 A/W. The maximum specific detectivity is 6.8×〖10〗^12 cm•〖Hz〗^(1/2) 〖•W〗^(-1) at 770 nm wavelength.
Źródło:
World Scientific News; 2015, 19; 32-49
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Preparation and Study of CdS thin films at different concentration thiorea by chemical bath deposition (CBD) method
Autorzy:
Anwar, H. Ali
Jassem, Sarah A.
Powiązania:
https://bibliotekanauki.pl/articles/1193882.pdf
Data publikacji:
2015
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Atomic Force Microscopy
CdS nanostructure
CdS thin films
UV-Vis
X-Ray Diffraction
XRD
chemical bath deposition
nanostructure
Opis:
CdS nanostructure are prepared by chemical bath deposition CBD method using different thiourea concentrations. The thiourea concentration effect for CdS nanostructure deposited on glasses substrate have been studied. CdS nanostructure give important analysis of X-ray diffraction (XRD), optical transmittance using (UV-Vis) spectroscopy, in addition to characterization of Atomic force microscopy (AFM) to analyze surface morphology of a film and to determine the grain size have proved a good agreement with experimental and theoretical results.
Źródło:
World Scientific News; 2015, 23; 73-89
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 28

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