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Determining the majority charge carrier, optical and structural properties of electrochemically deposited lead tin sulfide (PbSnS) thin films 电化学沉积的铅锡硫化(PbSnS)薄膜的主要载流子、光学和结构性质的测定
IF 1 4区 材料科学 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2023-03-01 DOI: 10.15251/cl.2023.203.205
I. Nkrumah, F. Ampong, A. Britwum, M. Paal, B. Kwakye-Awuah, R. K. Nkum, F. Boakye
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引用次数: 0
Voltage and frequency controlled Ge/SeO2 thin film transistors designed as rectifiers, negative capacitance and negative conductance sources 电压和频率控制的Ge/SeO2薄膜晶体管设计为整流器、负电容和负电导源
IF 1 4区 材料科学 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2023-03-01 DOI: 10.15251/cl.2023.203.177
A. F. Qasrawi, H. Khanfar
Herein voltage and frequency controlled thin film transistors fabricated by depositing SeO2 onto germanium thin crystals are reported. For these devices measurements of the current-voltage characteristics revealed a biasing dependent rectification ratios. The devices showed metal-oxide-semiconductor character under reverse biasing conditions. In addition, the biasing dependent capacitance and conductance spectral studies in the frequency domain of 20M-1000MHz has shown the possibility of switching the capacitance and negative conductance from negative mode to positive mode. The features of the Ge/SeO2 devices make them attractive for use in electronic circuits as parasitic capacitive circuit elements, noise reducers, signal amplifiers and microwave oscillators.
本文报道了在锗薄晶体上沉积SeO2制成的电压和频率控制薄膜晶体管。对这些器件的电流-电压特性测量揭示了偏置相关的整流比。在反向偏置条件下,器件表现出金属氧化物半导体特性。此外,在20M-1000MHz频域的偏置相关电容和电导谱研究表明,电容和负电导可以从负模式切换到正模式。Ge/SeO2器件的特性使它们在电子电路中作为寄生电容电路元件、降噪器、信号放大器和微波振荡器使用具有吸引力。
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引用次数: 1
Studying the effect of copper on the p-ZnTe/n-AgCuInSe2/p-Si for thin films solar cell applications 铜对薄膜太阳能电池用p-ZnTe/n-AgCuInSe2/p-Si的影响研究
IF 1 4区 材料科学 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2023-02-23 DOI: 10.15251/cl.2023.202.91
R. H. Athab, B. H. Hussein
A thin film of AgInSe2 and Ag1-xCuxInSe2 as well as n-Ag1-xCuxInSe2 /p-Si heterojunction with different Cu ratios (0, 0.1, 0.2) has been successfully fabricated by thermal evaporation method as absorbent layer with thickness about 700 nm and ZnTe as window layer with thickness about 100 nm. We made a multi-layer of p-ZnTe/n-AgCuInSe2/p-Si structures, In the present work, the conversion efficiency (η) increased when added the Cu and when used p-ZnTe as a window layer (WL) the bandgap energy of the direct transition decreases from 1.75 eV (Cu=0.0) to 1.48 eV (Cu=0.2 nm) and the bandgap energy for ZnTe=2.35 eV. The measurements of the electrical properties for prepared films showed that the D.C electrical conductivity (σd.c) increased with increasing Cu content for AgCuInSe2 thin films. So the electrical conductivity changed from 1 (Ω.cm)-1 to 29.96 (Ω.cm)-1 when x changed from 0.0 to 0.2. The prepared thin films have two activation energies (Ea1 & Ea2) in the temperature ranges of (300-393) K and (303-473) K. The C-V measurements revealed that all prepared heterojunctions were of the abrupt type and the junction capacitance reduced while the width of depletion region and the built-in potential increased with increasing the Cooper content. The current-voltage characteristics under dark condition of AgCuInSe2 heterojunctions, the current-voltage measurements under illumination showed that the performance of heterojunction solar cell improved with increasing Cu content. The result indicated that the prepared solar cell with 0.2 Ag content exhibited the highest efficiency (η = 1.68%) compared to other prepared solar cells.
采用热蒸发法成功地制备了AgInSe2和Ag1-xCuxInSe2以及不同Cu比(0,0.1,0.2)的n-Ag1-xCluxInSe2/p-Si异质结薄膜作为吸收层,厚度约为700nm,ZnTe作为窗口层,厚度为100nm。我们制备了p-ZnTe/n-AgCuInSe2/p-Si多层结构。在本工作中,当添加Cu时,转换效率(η)增加,当使用p-ZnTe作为窗口层(WL)时,直接跃迁的带隙能量从1.75eV(Cu=0.0)降低到1.48eV(Cu=0.2nm),ZnTe的带隙能为2.35eV。对所制备的薄膜的电学性能的测量表明,AgCuInSe2薄膜的直流电导率(σD.C)随着Cu含量的增加而增加。因此,当x从0.0变为0.2时,电导率从1(Ω.cm)-1变为29.96(Ω.cn)-1。所制备的薄膜在(300-393)K和(303-473)K的温度范围内具有两个激活能(Ea1和Ea2)。C-V测量表明,所有制备的异质结都是突变型的,结电容减小,而耗尽区的宽度和内建电势随着库珀含量的增加而增加。AgCuInSe2异质结在黑暗条件下的电流-电压特性和在光照下的电流电压测量表明,异质结太阳能电池的性能随着Cu含量的增加而提高。结果表明,与其他制备的太阳能电池相比,0.2 Ag含量的太阳能电池表现出最高的效率(η=1.68%)。
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引用次数: 0
Characterization and photocatalytic activity of CdZnS nanoparticles incorporated with medicative leaf excerpt 药用叶提取物掺杂CdZnS纳米颗粒的表征及光催化活性研究
IF 1 4区 材料科学 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2023-02-23 DOI: 10.15251/cl.2023.202.121
N. K. Cinsy, R. Jeya Geetha
The characterizations of synthesized CdZnS nanoparticles with Clitoria ternatea (Asian pigeon wings) leaf extract were done by the chemical precipitation method. The formation of CdZnS nanoparticles with the extract was confirmed by making use of XRD, SEM analysis and EDAX. XRD disclosed the structure and also the particle size. SEM investigation of CdZnS NPs confirmed shape and size. The optical studies were executed for the prepared sample. From the obtained UV-visible spectrum, band gap energy was determined using the Tauc plot. The photocatalytic activity of the processed sample was also analysed.
采用化学沉淀法对阴蒂叶提取物合成的CdZnS纳米颗粒进行了表征。通过XRD、SEM和EDAX分析,证实了萃取物可以形成纳米CdZnS。XRD揭示了该材料的结构和粒径。对CdZnS NPs的SEM研究证实了其形状和尺寸。对制备的样品进行了光学研究。从得到的紫外可见光谱中,利用Tauc图确定带隙能量。分析了处理后样品的光催化活性。
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引用次数: 1
Mechanical stability parameters of chalcogenides and pnictides based optoelectronic materials 硫族化合物和肽类化合物基光电材料的机械稳定性参数
IF 1 4区 材料科学 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2023-02-23 DOI: 10.15251/cl.2023.202.101
R. Gupta, P. Varshney, Pravesh, M. Lal, D. Kumar, K. Singh, A. Verma
A study of experimental data reveals that the bulk modulus of chalcogenides and pnictides based chalcopyrites (AIIBIVC2 V and AI BIIIC2 VI) can be explained by a simple scaling rule that rely only on the crystal ionicity, ionic charge product, and the melting temperature. PVV theory of crystal ionicity, temperature dependence of elasticity and product of ionic charge theory are taken into account for the study. Based on this result, a simple microhardnessbulk modulus relation is applied to evaluate the microhardness of the complex compounds; which correspond well with the experimental data and other published results. The proposed findings support in the modeling of emerging semiconductor materials and even understanding of their mechanical properties for optoelectronics, photovoltaic, electromagnetic (EM) screening, and spintronic applications. PACS: 62.20.-x; 62.20.Qp
对实验数据的研究表明,硫族化物和磷族化物基硫黄铁矿(AIIBIVC2 V和AI BIIIC2 VI)的体积模量可以通过一个简单的标度规则来解释,该规则仅依赖于晶体电离度、离子电荷产物和熔融温度。研究中考虑了晶体离子性的PVV理论、弹性的温度依赖性和离子电荷的乘积理论。在此基础上,采用简单的微硬度-体积模量关系式来评价复合材料的显微硬度;这与实验数据和其他已发表的结果非常吻合。所提出的发现有助于新兴半导体材料的建模,甚至有助于理解其在光电子、光伏、电磁(EM)屏蔽和自旋电子应用中的机械性能。PACS:62.20.-x;62.20 Qp
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引用次数: 0
Preparation of CdS/g-C3N4 heterojunction photocatalyst with high activity sites by acid treatment 酸处理制备高活性位CdS/g-C3N4异质结光催化剂
IF 1 4区 材料科学 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2023-02-23 DOI: 10.15251/cl.2023.202.153
Y. L. Ma, Y. Tao
The key to achieve efficient degradation of organic pollutants lies in improving the separation efficiency of photogenerated electron-hole pairs in photocatalysts. Here, the hydrogen bonds between g-C3N4 layers were broken by concentrated acid etching and exfoliation to obtain a more dispersed and lighter g-C3N4 nanosheet structure, and then the CdS spherical nanoparticles were dispersed on g-C3N4 nanosheets by hydrothermal method. The optimal loading of CdS on g-C3N4 nanosheets was determined by testing the degradation performance of the composite photocatalysts with different loading amounts. The degradation performance was tested by simulating sunlight using a 700-800 W xenon lamp equipped with a 420 nm cut-off filter, which showed that the degradation of MB by 7% CdS/g-C3N4 photocatalyst was 90.7% for MB. It indicates that concentrated acid treatment and loading of CdS nanoparticles can significantly improve the photocatalytic activity of g-C3N4 nanosheets, which is attributed to the enhancedup conversion function of g-C3N4 by loading CdS to enhance the response range and ability of g-C3N4 in visible light and the photogenerated electron-hole pair separation rate by loading CdS, thus improving the photocatalytic performance of the composite.
实现有机污染物高效降解的关键在于提高光催化剂中光生电子-空穴对的分离效率。这里,通过浓酸蚀刻和剥离来破坏g-C3N4层之间的氢键,以获得更分散、更轻的g-C3N4-纳米片结构,然后通过水热法将CdS球形纳米颗粒分散在g-C3N4/纳米片上。通过测试不同负载量的复合光催化剂的降解性能,确定了CdS在g-C3N4纳米片上的最佳负载量。使用配备420nm截止滤光片的700-800W氙灯模拟阳光测试了MB的降解性能,结果表明,7%CdS/g-C3N4光催化剂对MB的降解率为90.7%。结果表明,CdS纳米颗粒的浓酸处理和负载可以显著提高g-C3N4纳米片的光催化活性,这归因于负载CdS增强了g-C3N4的转换功能,增强了g-C3N4在可见光下的响应范围和能力,并通过负载CdS提高了光生电子-空穴对分离率,从而提高了复合材料的光催化性能。
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引用次数: 0
Effect of phosphoric acid treatment on the physical properties of zinc telluride thin films 磷酸处理对碲化锌薄膜物理性能的影响
IF 1 4区 材料科学 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2023-02-23 DOI: 10.15251/cl.2023.202.113
A. Aqili, T. Abu-Omar, A. Al-Reyahi, A. Shaheen, S. Al-Omari, I. Alhagish
Zinc Telluride (ZnTe) films were prepared by the closed space sublimation (CSS) method. The effect of chemical treatments with concentrated phosphoric acid, on the optical, electric and structural properties of the films was studied. Zinc-blend structure of the polycrystalline nature of the films was confirmed by x-ray diffraction (XRD) spectra. The energy dispersive x-ray (EDX) shows an increase in Te ratio on the surface of the film as exposed to phosphoric acid. In addition, the dc electrical resistivity of the films was dropped considerably. The refractive index, thickness, and thickness irregularity of the films were determined by fitting of the optical transmittance spectra in the wavelength range 400 to 2500 nm. The effect, of treatment, on the optical parameters is also reported.
采用封闭空间升华(CSS)法制备了碲化锌(ZnTe)薄膜。研究了浓磷酸化学处理对薄膜光学、电学和结构性能的影响。通过x射线衍射(XRD)光谱证实了薄膜的多晶性质的锌共混物结构。能量色散x射线(EDX)显示,当暴露于磷酸时,膜表面上的Te比率增加。此外,薄膜的直流电阻率显著下降。膜的折射率、厚度和厚度不规则性通过拟合400至2500nm波长范围内的透光光谱来确定。还报道了处理对光学参数的影响。
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引用次数: 0
Structural, optical, and photocatalytic activity of ZnS:Er nanoparticles ZnS:Er纳米颗粒的结构、光学和光催化活性
IF 1 4区 材料科学 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2023-02-23 DOI: 10.15251/cl.2023.202.85
B. Poornaprakash, P. Puneetha, M. P. Reddy, Y. L. Kim
ZnS and Er (2 at%) doped ZnS nanoparticles (NPs) were synthesized through coprecipitation process. EDAX analysis confirmed that the presence of Er (III) ions in the prepared sample with an anticipated stoichiometry. TEM analyses displayed that the prepared NPs showed near spheroid shapes with an average size ranging from 4.8 to 5.2 nm. XRD measurements confirmed the authentic incorporation of Er (III) ions in the ZnS lattice. DRS measurements certified that Er (III) doping declines the ZnS bandgap from 3.72 to 3.56 eV. Magnetic measurements revealed that the Er-doped ZnS NPs displayed soft ferromagnetism and became better at higher doping concentrations. The Er (2 at%) doped ZnS NPs exhibited a higher rhodamine B dye degradation rate than the ZnS. Hence, the Er doped ZnS NPs are promising materials for dye degradation and optoelectronics.
采用共沉淀法合成了ZnS和Er(2原子%)掺杂的ZnS纳米粒子。EDAX分析证实,制备的样品中存在预期化学计量的Er(III)离子。TEM分析显示,所制备的NP显示出平均尺寸在4.8至5.2nm范围内的近球形形状。XRD测量证实了Er(III)离子在ZnS晶格中的真实掺入。DRS测量证明,Er(III)掺杂使ZnS带隙从3.72eV下降到3.56eV。磁性测量表明,Er掺杂的ZnS NPs表现出软铁磁性,并且在更高的掺杂浓度下变得更好。掺Er(2 at%)的ZnS NP表现出比ZnS更高的若丹明B染料降解率。因此,掺铒的ZnS纳米颗粒是一种很有前途的染料降解和光电子材料。
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引用次数: 0
Fabrication and evaluation of CuAlSe2/Si photodetector CuAlSe2/Si光电探测器的制备与评价
IF 1 4区 材料科学 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2023-02-23 DOI: 10.15251/cl.2023.202.145
H. K. Hassun, B. K. Al-Maiyaly, A. H. Shaban
In this work, we have examined the spectral response of (p-CuAlSe2/n-Si) detector, (CAS) thin films deposited by thermal evaporation at RT with a thickness (450) nm, and annealing temperature at (473K) for 2 h. Optical transmission measurements displayed reasonably slight transmission besides higher absorbance trendy the visible region, energy gaps were observed by annealing, were found to be direct, and decreased with the effect of annealing. The extreme responsivity value arises at wavelength 459 nm, with improvement value of specific detectivity and quantum efficiency the annealing films be situated originate as greatest suitable aimed at numerous device application.
在这项工作中,我们检查了(p-CuAlSe2/n-Si)探测器的光谱响应,(CAS)薄膜通过在RT下热蒸发沉积,厚度为(450)nm,退火温度为(473K)2小时。光学透射测量显示出相当轻微的透射,除了在可见区域具有更高的吸收率外,被发现是直接的并且随着退火的影响而减少。极端响应度值出现在波长459nm处,随着比探测率和量子效率的提高,退火膜的位置最适合用于多种器件应用。
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引用次数: 0
Tuned optoelectronic and thermoelectric properties of TIMX2 through M=Ga,In X=S,Se,Te intercalation 通过M=Ga,In = X=S,Se,Te插层调整TIMX2的光电和热电性能
IF 1 4区 材料科学 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2023-02-23 DOI: 10.15251/cl.2023.202.131
I. Ur Rahman, M. Khalid, M. Aamer, F. Ali, Muhammad Umair Javed, Q. Rafiq, M. Jawad, T. Raouf Qureshi, M. Irfan, S. Azam
We presents our analysis on structural electronic and optical properties of TlX and TlMX2 (M =In, Ga; X = Te, Se, S) compound, by first principle density functional theory (DFT).These chalcogenide have a place with a group of the low-dimensionals semiconductors having chains or layered design. They are of critical interested as a result of, their exceptionally anisotropics properties, semiconductivity and photoconductivity, non direct impacts in their IV qualities (counting a district of negatived differentials opposition), exchanging and memories impacts, secondly symphonious opticals age, relaxors conduct and possible application for optoelectronics devices. We reviews the crystals structured of TlMX2 compound, their transports properties below surrounding condition, test and hypothetical investigations of the electronics construction, transports properties and semiconductors metal phased transition below highly tension, and successions of temperature instigated primary phased transition with middle disproportionate state. Electronics natured of the ferroelectrics phased transition in the previously mentione mixes, just as arelaxors conduct, nano domain and conceivable event of quantums specks in dopeds and illuminated precious crystals are examined.
用第一原理密度泛函理论(DFT)分析了TlX和TlMX2(M=In,Ga;X=Te,Se,S)化合物的结构、电子和光学性质。由于它们异常各向异性的性质、半导电性和光电导性、IV质量的非直接影响(计算出一个负微分的区域)、交换和记忆影响、第二交响光学器件的老化、弛豫剂的导电性以及在光电子器件中的可能应用,它们引起了极大的兴趣。我们综述了TlMX2化合物的晶体结构、它们在周围条件下的传输特性、电子结构的测试和假设研究、传输特性和高张力下的半导体金属相转变,以及具有中等不相称状态的温度引发的一次相转变的连续性。前面提到的混合物中铁电相变的电子性质,就像激励器传导一样,研究了掺杂剂和发光的贵晶体中的纳米畴和量子点的可能事件。
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引用次数: 0
期刊
Chalcogenide Letters
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