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Synthesis and structural characterization of BiSbTe3 topological insulator single crystal bbte3拓扑绝缘体单晶的合成及结构表征
Indu Rajput, A. Lakhani
We report the synthesis and structural characterization of the topological insulator BiSbTe3 single crystal. In Bi2Te3, the Fermi level (EF) lies in the bulk conduction band due to electron type bulk carriers induced by Te vacancies. While in Sb2Te3, Fermi level lies in the bulk valance band due to hole type bulk carriers induced by Sb-Te antisite defects. It is difficult to observe the topological properties by transport experiments due to excess contribution from bulk states. By mixing these two compounds, the ratio of bismuth (Bi) to antimony (Sb) can shift the Fermi level (EF) from bulk conduction band to bulk valance band providing an opportunity to realize ideal topological insulator with insulating bulk. In (Bi1-xSbx)2Te3, at Bi:Sb ratio of 1:1, the Fermi level lies in the bulk gap which is ideal for probing topological surface states through transport measurements. We have grown good quality single crystals of BiSbTe3 using modified Bridgman method. The X-ray diffraction analysis, Scanning electron microscopy and Energy dispersive electron spectroscopy confirms the single crystal formation, phase purity and stoichiometric atomic ratio of the prepared crystal. The electrical resistivity measurement of the crystal shows the metallic nature and high quality of the grown crystal.We report the synthesis and structural characterization of the topological insulator BiSbTe3 single crystal. In Bi2Te3, the Fermi level (EF) lies in the bulk conduction band due to electron type bulk carriers induced by Te vacancies. While in Sb2Te3, Fermi level lies in the bulk valance band due to hole type bulk carriers induced by Sb-Te antisite defects. It is difficult to observe the topological properties by transport experiments due to excess contribution from bulk states. By mixing these two compounds, the ratio of bismuth (Bi) to antimony (Sb) can shift the Fermi level (EF) from bulk conduction band to bulk valance band providing an opportunity to realize ideal topological insulator with insulating bulk. In (Bi1-xSbx)2Te3, at Bi:Sb ratio of 1:1, the Fermi level lies in the bulk gap which is ideal for probing topological surface states through transport measurements. We have grown good quality single crystals of BiSbTe3 using modified Bridgman method. The X-ray diffraction analysis, Scanning electro...
本文报道了拓扑绝缘体bbte3单晶的合成和结构表征。在Bi2Te3中,由于Te空位诱导的电子型体载流子,费米能级(EF)位于体导带。而在Sb2Te3中,由于Sb-Te反位缺陷引起的空穴型体载流子,费米能级位于体价带。由于体态的贡献过大,通过输运实验很难观察到拓扑性质。通过这两种化合物的混合,铋(Bi)与锑(Sb)的比例可以将费米能级(EF)从体导带转移到体价带,为实现具有绝缘体的理想拓扑绝缘体提供了机会。在(Bi1-xSbx)2Te3中,当Bi:Sb比为1:1时,费米能级位于通过输运测量探测拓扑表面态的体隙中。我们用改进的Bridgman法生长出了高质量的BiSbTe3单晶。x射线衍射分析、扫描电子显微镜和能量色散电子能谱证实了所制备晶体的单晶形成、相纯度和化学计量原子比。晶体的电阻率测量显示了晶体的金属性质和高质量。本文报道了拓扑绝缘体bbte3单晶的合成和结构表征。在Bi2Te3中,由于Te空位诱导的电子型体载流子,费米能级(EF)位于体导带。而在Sb2Te3中,由于Sb-Te反位缺陷引起的空穴型体载流子,费米能级位于体价带。由于体态的贡献过大,通过输运实验很难观察到拓扑性质。通过这两种化合物的混合,铋(Bi)与锑(Sb)的比例可以将费米能级(EF)从体导带转移到体价带,为实现具有绝缘体的理想拓扑绝缘体提供了机会。在(Bi1-xSbx)2Te3中,当Bi:Sb比为1:1时,费米能级位于通过输运测量探测拓扑表面态的体隙中。我们用改进的Bridgman法生长出了高质量的BiSbTe3单晶。x射线衍射分析,扫描电子…
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引用次数: 1
Tuning the photocatalytic performance of Degussa P25 through phase ratio optimization 通过相比优化优化德固赛P25光催化性能
Pujita Ningthoukhongjam, Ranjith G. Nair
Development of sustainable energy sources and methods for proper waste management is the need of the hour. Photocatalysis could be one of the potential solutions to mitigate both these problems. But, certain issues like narrow absorption range, low surface area and high charge carrier recombination limit the photocatalytic performance of catalysts like Degussa P25 (TiO2 powder). In this study, the effect of phase ratio on the physicochemical properties of Degussa P25 (DP25), particularly the dependence of photocatalytic activity on phase ratio is studied. The phase ratio of DP25 has been tuned to have different percentages of anatase and rutile phases via calcination. X-Ray Diffraction (XRD), Field Emission Scanning Electron Microscopy (FESEM), UV-vis spectroscopy and Photoluminescence (PL) were used to determine the structural, morphological and optical properties of the samples. XRD analyses confirmed that all the samples are in mixed phase with nanoscale crystallite sizes are found to be in the nanoscale. The phase ratio of anatase to rutile content of the samples was calculated using Spurr’s formula. The anatase to rutile (A/R) phase ratio was found to decrease with increase in calcination temperature. Tauc’s plot was used to determine the optical band gaps of the samples. PL studies were used to identify the trap levels. Photocatalytic test of the samples were conducted under Ultra Violet (UV) irradiation using Methylene Blue (MB) as probe pollutant. The role of phase ratio on photocatalytic performance was analyzed. The sample with A/R ratio 1.44 showed superior photocatalytic activity compared to others. This study confirms the need of phase ratio optimization of Degussa P25 to improve its photocatalytic performance further.Development of sustainable energy sources and methods for proper waste management is the need of the hour. Photocatalysis could be one of the potential solutions to mitigate both these problems. But, certain issues like narrow absorption range, low surface area and high charge carrier recombination limit the photocatalytic performance of catalysts like Degussa P25 (TiO2 powder). In this study, the effect of phase ratio on the physicochemical properties of Degussa P25 (DP25), particularly the dependence of photocatalytic activity on phase ratio is studied. The phase ratio of DP25 has been tuned to have different percentages of anatase and rutile phases via calcination. X-Ray Diffraction (XRD), Field Emission Scanning Electron Microscopy (FESEM), UV-vis spectroscopy and Photoluminescence (PL) were used to determine the structural, morphological and optical properties of the samples. XRD analyses confirmed that all the samples are in mixed phase with nanoscale crystallite sizes are found to be in the nanosca...
发展可持续能源和适当的废物管理方法是当前的需要。光催化可能是缓解这两个问题的潜在解决方案之一。但是,吸收范围窄、比表面积小、载流子复合率高等问题限制了德固赛P25 (TiO2粉)等催化剂的光催化性能。本研究研究了相比对德固赛P25 (DP25)理化性质的影响,特别是光催化活性对相比的依赖关系。通过煅烧调整DP25的相比,使其具有不同比例的锐钛矿和金红石相。采用x射线衍射(XRD)、场发射扫描电镜(FESEM)、紫外可见光谱(UV-vis)和光致发光(PL)对样品的结构、形态和光学性质进行了表征。XRD分析证实,样品均为纳米级混合相,晶粒尺寸均为纳米级。用斯珀尔公式计算了样品中锐钛矿与金红石含量的相比。随着煅烧温度的升高,锐钛矿与金红石(A/R)相比减小。用陶克图确定样品的光学带隙。利用PL研究来确定捕集器水平。以亚甲基蓝(MB)为探测污染物,在紫外线(UV)照射下对样品进行光催化试验。分析了相比对光催化性能的影响。A/R比为1.44的样品具有较好的光催化活性。本研究证实了对德固赛P25进行相比优化以进一步提高其光催化性能的必要性。发展可持续能源和适当的废物管理方法是当前的需要。光催化可能是缓解这两个问题的潜在解决方案之一。但是,吸收范围窄、比表面积小、载流子复合率高等问题限制了德固赛P25 (TiO2粉)等催化剂的光催化性能。本研究研究了相比对德固赛P25 (DP25)理化性质的影响,特别是光催化活性对相比的依赖关系。通过煅烧调整DP25的相比,使其具有不同比例的锐钛矿和金红石相。采用x射线衍射(XRD)、场发射扫描电镜(FESEM)、紫外可见光谱(UV-vis)和光致发光(PL)对样品的结构、形态和光学性质进行了表征。XRD分析证实,样品均为纳米级混合相,晶粒尺寸均为纳米级。
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引用次数: 0
High intense blue-violet luminescent carbon dots derived from camphor soot 高强度的蓝紫色发光碳点来源于樟脑烟尘
S. A. Kumar, C. Joseph
Highly luminescent carbon quantum dot with Blue-Violet emission was synthesized from camphor by simple combustion followed by sonication. Prepared carbon dots were characterized by transmission electron microscopy, uv absorption spectroscopy, Fourier transform infrared spectroscopy and photoluminescence spectroscopy. The synthesized carbon dots have very small size of less than 10nm. Fluorescence study of the prepared carbon dots revealed that it has an excitation independent emission in the near-uv wavelengths with a fluorescence red shift from 385nm to 430 nm by ageing.Highly luminescent carbon quantum dot with Blue-Violet emission was synthesized from camphor by simple combustion followed by sonication. Prepared carbon dots were characterized by transmission electron microscopy, uv absorption spectroscopy, Fourier transform infrared spectroscopy and photoluminescence spectroscopy. The synthesized carbon dots have very small size of less than 10nm. Fluorescence study of the prepared carbon dots revealed that it has an excitation independent emission in the near-uv wavelengths with a fluorescence red shift from 385nm to 430 nm by ageing.
以樟脑为原料,经简单燃烧-超声合成了具有蓝紫色发光特性的高发光碳量子点。采用透射电子显微镜、紫外吸收光谱、傅里叶变换红外光谱和光致发光光谱对制备的碳点进行了表征。合成的碳点尺寸非常小,小于10nm。对制备的碳点进行了荧光研究,发现其在近紫外波段具有激发无关的发光,随着老化,其荧光红移从385nm到430nm。以樟脑为原料,经简单燃烧-超声合成了具有蓝紫色发光特性的高发光碳量子点。采用透射电子显微镜、紫外吸收光谱、傅里叶变换红外光谱和光致发光光谱对制备的碳点进行了表征。合成的碳点尺寸非常小,小于10nm。对制备的碳点进行了荧光研究,发现其在近紫外波段具有激发无关的发光,随着老化,其荧光红移从385nm到430nm。
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引用次数: 0
Deposition of tin oxide thin film by sol-gel dip coating technique and its characterization 溶胶-凝胶浸涂法制备氧化锡薄膜及其表征
B. R. Aswathy, K. Vinay, M. Arjun, P. Manoj
Tin oxide (Sn3O4) thin films were deposited on glass substrate using inorganic precursor by sol gel dip coating technique. The structural studies of the films were obtained by X-ray diffraction technique and the data showed that the synthesized tin oxide films have triclinic structure with preferred orientation along (-2, 1, 0) and (-4, 2,0) plane. Optical studies revealed that the film having more thickness shows better transmission about 92% in the visible region and optical band gap energy increases to 2.93eV due to Moss-Burstein effect. The presence of tin and oxygen in the samples were confirmed with characteristic vibrational mode of Sn–O in the region 430–482 cm−1 and 669-674 cm−1 using FTIR spectroscopy. Photoluminescence spectra shows the presence of emission in the visible region depends on thickness of the film. This study suggests that the sol-gel dip coating method is the best method for fabricating highly pure, transparent and homogenous mixed valence phase of tin oxide thin film and further studies may be required to tailor electrical and optical properties of the films suitable for various optoelectronic applications.Tin oxide (Sn3O4) thin films were deposited on glass substrate using inorganic precursor by sol gel dip coating technique. The structural studies of the films were obtained by X-ray diffraction technique and the data showed that the synthesized tin oxide films have triclinic structure with preferred orientation along (-2, 1, 0) and (-4, 2,0) plane. Optical studies revealed that the film having more thickness shows better transmission about 92% in the visible region and optical band gap energy increases to 2.93eV due to Moss-Burstein effect. The presence of tin and oxygen in the samples were confirmed with characteristic vibrational mode of Sn–O in the region 430–482 cm−1 and 669-674 cm−1 using FTIR spectroscopy. Photoluminescence spectra shows the presence of emission in the visible region depends on thickness of the film. This study suggests that the sol-gel dip coating method is the best method for fabricating highly pure, transparent and homogenous mixed valence phase of tin oxide thin film and further...
采用溶胶-凝胶浸涂技术,采用无机前驱体在玻璃基板上沉积氧化锡(Sn3O4)薄膜。利用x射线衍射技术对膜的结构进行了研究,结果表明,合成的氧化锡膜具有沿(- 2,1,0)和(- 4,2,0)平面优先取向的三斜结构。光学研究表明,薄膜厚度越大,在可见光区域的透射率越高,约为92%,并且由于Moss-Burstein效应,光学带隙能量增加到2.93eV。在430 ~ 482 cm−1和669 ~ 674 cm−1区域Sn-O的特征振动模式证实了样品中锡和氧的存在。光致发光光谱显示可见光区域的发射取决于薄膜的厚度。该研究表明,溶胶-凝胶浸渍法是制备高纯度、透明、均匀的混合价相氧化锡薄膜的最佳方法,需要进一步研究以适应各种光电应用的薄膜的电学和光学性能。采用溶胶-凝胶浸涂技术,采用无机前驱体在玻璃基板上沉积氧化锡(Sn3O4)薄膜。利用x射线衍射技术对膜的结构进行了研究,结果表明,合成的氧化锡膜具有沿(- 2,1,0)和(- 4,2,0)平面优先取向的三斜结构。光学研究表明,薄膜厚度越大,在可见光区域的透射率越高,约为92%,并且由于Moss-Burstein效应,光学带隙能量增加到2.93eV。在430 ~ 482 cm−1和669 ~ 674 cm−1区域Sn-O的特征振动模式证实了样品中锡和氧的存在。光致发光光谱显示可见光区域的发射取决于薄膜的厚度。研究表明,溶胶-凝胶浸渍法是制备高纯度、透明、均匀的混合价相氧化锡薄膜的最佳方法。
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引用次数: 4
Structural and photoluminescence studies of cerium europium co-doped Strontium barium niobate 铈铕共掺杂铌酸锶钡的结构和光致发光研究
N. John
Cerium Europium co-doped Strontium barium niobate (SBN) nano ceramic systems at different concentrations were prepared by sol gel method. The structural properties were characterised by X-ray diffraction, FTIR and Raman spectroscopy. X-ray diffraction analysis confirms the tetragonal structure of the prepared system. EDAX analysis confirms the components present in the sample. SEM image shows the needle like morphology of the nano system. XRD image confirms the particle size and crystalline planes of the prepared nanosized cerium europium doped SBN with the standard value. The broad absorption peak at 291 and 273 nm were observed for 0.1, 0.2 % Cerium, Europium co-doped SBN nano system. The absorption in the samples is from direct transition and the values of energy gap were calculated as 2.11 eV and. 2.27 eV. Photoluminescence studies shows the broad emission peaks at 419, 447, 493 nm due to 5d-4f Ce3+ transition levels. The peaks at 440, 449 nm were also observed due to the emission from SBN and less intense peaks at 558, 576, 588 nm due to the 5D0—7F0, 7F1 transitions of Eu3+ when excited at 305 nm wavelength. From the measured luminescence decay profiles, the tri-exponential lifetime of the 0.1% Cerium, Europium co-doped SBN nano system was calculated at 440 nm emission wavelength. Therefore the cerium europium co-doped SBN can be used for optical applications.Cerium Europium co-doped Strontium barium niobate (SBN) nano ceramic systems at different concentrations were prepared by sol gel method. The structural properties were characterised by X-ray diffraction, FTIR and Raman spectroscopy. X-ray diffraction analysis confirms the tetragonal structure of the prepared system. EDAX analysis confirms the components present in the sample. SEM image shows the needle like morphology of the nano system. XRD image confirms the particle size and crystalline planes of the prepared nanosized cerium europium doped SBN with the standard value. The broad absorption peak at 291 and 273 nm were observed for 0.1, 0.2 % Cerium, Europium co-doped SBN nano system. The absorption in the samples is from direct transition and the values of energy gap were calculated as 2.11 eV and. 2.27 eV. Photoluminescence studies shows the broad emission peaks at 419, 447, 493 nm due to 5d-4f Ce3+ transition levels. The peaks at 440, 449 nm were also observed due to the emission from SBN and less in...
采用溶胶-凝胶法制备了不同浓度的铈铕共掺杂铌酸锶钡纳米陶瓷体系。用x射线衍射、红外光谱和拉曼光谱对其结构性质进行了表征。x射线衍射分析证实了所制备体系的四边形结构。EDAX分析证实了样品中存在的成分。SEM图像显示了纳米体系的针状形态。XRD图像证实了制备的纳米铕铈掺杂SBN的粒径和晶面符合标准值。0.1、0.2%铈、铕共掺杂的SBN纳米体系在291和273 nm处有宽吸收峰。样品中的吸收来自于直接跃迁,计算出能隙值为2.11 eV和。2.27 eV。光致发光研究表明,由于5d-4f Ce3+的跃迁水平,在419、447、493 nm处有宽发射峰。由于SBN的发射,在440、449 nm处也观测到了峰;在305 nm激发下,由于Eu3+的5D0-7F0、7F1跃迁,在558,576,588 nm处也观测到了较弱的峰。根据测量的发光衰减曲线,计算了在440 nm发射波长下0.1%铈、铕共掺杂SBN纳米体系的三指数寿命。因此,铈铕共掺杂SBN可用于光学领域。采用溶胶-凝胶法制备了不同浓度的铈铕共掺杂铌酸锶钡纳米陶瓷体系。用x射线衍射、红外光谱和拉曼光谱对其结构性质进行了表征。x射线衍射分析证实了所制备体系的四边形结构。EDAX分析证实了样品中存在的成分。SEM图像显示了纳米体系的针状形态。XRD图像证实了制备的纳米铕铈掺杂SBN的粒径和晶面符合标准值。0.1、0.2%铈、铕共掺杂的SBN纳米体系在291和273 nm处有宽吸收峰。样品中的吸收来自于直接跃迁,计算出能隙值为2.11 eV和。2.27 eV。光致发光研究表明,由于5d-4f Ce3+的跃迁水平,在419、447、493 nm处有宽发射峰。由于SBN的发射,在440,449 nm处也观察到峰,而在…
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引用次数: 0
Fabrication of interdigitated electrodes (IDEs) modified with sensitive layers of ZnO nanorods and nanoflowers ZnO纳米棒和纳米花敏感层修饰的交叉指状电极的制备
A. Kumar, S. K. Kumar
The novel nano structures of the sensitive layer with interdigitated electrodes (IDEs) platforms have a significant interest in miniaturized electrochemical sensor applications. Herein, we report the design fabrication and characterization of IDEs decorated with hydrothermal growth of ZnO nanorods (NRs) and nanoflowers (NFs) active layers. The IDEs patterns designed and tested using CIRCAD software tool with the dimension of 10 mm long, 0.5 mm wide and the 0.5 mm interspace between the adjacent fingers. A four-step deposition of ZnO seed layer followed by a hydrothermal treatment lead to produce the heavily ordered ZnO NFs and NRs patterns on the screen printed IDEs. The structural and chemical compositional of the NFs and NRs were examined by using field emission scanning electron microscopy (FeSEM), atomic force microscopy (AFM), energy dispersive spectroscopy (EDS), X-ray diffractometer (XRD). The screen printed IDEs decorated with NFs and NRs can be used in the design of future electrochemical sensor applications.The novel nano structures of the sensitive layer with interdigitated electrodes (IDEs) platforms have a significant interest in miniaturized electrochemical sensor applications. Herein, we report the design fabrication and characterization of IDEs decorated with hydrothermal growth of ZnO nanorods (NRs) and nanoflowers (NFs) active layers. The IDEs patterns designed and tested using CIRCAD software tool with the dimension of 10 mm long, 0.5 mm wide and the 0.5 mm interspace between the adjacent fingers. A four-step deposition of ZnO seed layer followed by a hydrothermal treatment lead to produce the heavily ordered ZnO NFs and NRs patterns on the screen printed IDEs. The structural and chemical compositional of the NFs and NRs were examined by using field emission scanning electron microscopy (FeSEM), atomic force microscopy (AFM), energy dispersive spectroscopy (EDS), X-ray diffractometer (XRD). The screen printed IDEs decorated with NFs and NRs can be used in the design of future electrochemical sensor ...
具有交错电极(IDEs)平台的新型纳米结构敏感层在小型化电化学传感器应用中具有重要意义。本文报道了水热生长ZnO纳米棒(NRs)和纳米花(NFs)活性层修饰的ide的设计、制造和表征。采用CIRCAD软件工具设计并测试的ide图案尺寸为长10mm,宽0.5 mm,相邻手指间距0.5 mm。通过四步沉积ZnO种子层,然后进行水热处理,可以在丝网印刷的ide上产生高度有序的ZnO NFs和NRs图案。采用场发射扫描电镜(FeSEM)、原子力显微镜(AFM)、能谱仪(EDS)、x射线衍射仪(XRD)等对纳米颗粒和纳米颗粒的结构和化学成分进行了表征。采用NFs和NRs装饰的丝网印刷ide可用于未来电化学传感器的设计。具有交错电极(IDEs)平台的新型纳米结构敏感层在小型化电化学传感器应用中具有重要意义。本文报道了水热生长ZnO纳米棒(NRs)和纳米花(NFs)活性层修饰的ide的设计、制造和表征。采用CIRCAD软件工具设计并测试的ide图案尺寸为长10mm,宽0.5 mm,相邻手指间距0.5 mm。通过四步沉积ZnO种子层,然后进行水热处理,可以在丝网印刷的ide上产生高度有序的ZnO NFs和NRs图案。采用场发射扫描电镜(FeSEM)、原子力显微镜(AFM)、能谱仪(EDS)、x射线衍射仪(XRD)等对纳米颗粒和纳米颗粒的结构和化学成分进行了表征。采用NFs和NRs装饰的丝网印刷ide可用于未来电化学传感器的设计。
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引用次数: 2
Photovoltaic performance of solution-processed ternary solar cells based on PTB7: PCBM and squaraine dye 基于pptb7: PCBM和方碱染料的溶液法制备三元太阳能电池的光伏性能
B. Anitha, A. Alexander, M. Namboothiry
The performance of poly[[4,8-bis[(2-ethylhexyl)oxy]benzo[1,2-b:4,5-b′]dithiophene-2,6-diyl] [3-fluoro-2-[(2-ethylhexyl)carbonyl] thieno[3,4-b]thiophenediyl]]: [6,6]-phenyl-C70-butyric-acid-methyl-ester) (PTB7: PC70BM) based inverted bulk heterojunction organic solar cell by introducing squaraine (SQ) dye as the third component is investigated. The photovoltaic devices with an architecture ITO/ ZnO/ active layer/ MoO3 /Ag in which active layers of pristine PTB7: PCBM, and PTB7: PCBM: SQ with different concentrations of SQ are fabricated, and the J-V characteristics are measured under an illumination intensity of 100 mWcm−2. The effect of the introduction of SQ on the photovoltaic parameters of PTB7: PCBM solar cells are analyzed in detail. UV-Vis-NIR absorption spectra of the binary and ternary blends are recorded to study the variations in the absorption with different loadings of SQ in the ternary blends. The morphology of the blend films is analyzed by atomic force microscopy. To study the influence of device area on the cell parameters, solar cells of different active areas viz. 0.09, 0.25, 0.49, and 1 cm2 are made and the variation of cell parameters like short circuit current density, open circuit voltage and fill factor with device area is also studied.The performance of poly[[4,8-bis[(2-ethylhexyl)oxy]benzo[1,2-b:4,5-b′]dithiophene-2,6-diyl] [3-fluoro-2-[(2-ethylhexyl)carbonyl] thieno[3,4-b]thiophenediyl]]: [6,6]-phenyl-C70-butyric-acid-methyl-ester) (PTB7: PC70BM) based inverted bulk heterojunction organic solar cell by introducing squaraine (SQ) dye as the third component is investigated. The photovoltaic devices with an architecture ITO/ ZnO/ active layer/ MoO3 /Ag in which active layers of pristine PTB7: PCBM, and PTB7: PCBM: SQ with different concentrations of SQ are fabricated, and the J-V characteristics are measured under an illumination intensity of 100 mWcm−2. The effect of the introduction of SQ on the photovoltaic parameters of PTB7: PCBM solar cells are analyzed in detail. UV-Vis-NIR absorption spectra of the binary and ternary blends are recorded to study the variations in the absorption with different loadings of SQ in the ternary blends. The morphology of the blend films is analyzed by atomic force microscopy. To study the influence of ...
通过引入方碱(SQ)染料作为第三组分,研究了聚[[4,8-二[(2-乙基己基)氧]苯并[1,2-b:4,5-b ']二噻吩-2,6-二基][3-氟-2-[(2-乙基己基)羰基]噻吩[3,4-b]噻吩二基]]:[6,6]-苯基- c70 -丁酸甲酯)(PTB7: PC70BM)基倒置体异质结有机太阳能电池的性能。制备了ITO/ ZnO/有源层/ MoO3 /Ag结构的光电器件,其中原初PTB7: PCBM有源层和不同SQ浓度的PTB7: PCBM: SQ有源层,并在100 mWcm−2的光照强度下测量了其J-V特性。详细分析了SQ的引入对PTB7: PCBM太阳能电池光伏参数的影响。记录了二元和三元共混物的紫外-可见-近红外吸收光谱,研究了三元共混物中SQ的不同添加量对其吸收的影响。用原子力显微镜分析了共混膜的形貌。为了研究器件面积对电池参数的影响,制作了0.09、0.25、0.49、1 cm2不同有效面积的太阳能电池,研究了短路电流密度、开路电压、填充因子等电池参数随器件面积的变化。通过引入方碱(SQ)染料作为第三组分,研究了聚[[4,8-二[(2-乙基己基)氧]苯并[1,2-b:4,5-b ']二噻吩-2,6-二基][3-氟-2-[(2-乙基己基)羰基]噻吩[3,4-b]噻吩二基]]:[6,6]-苯基- c70 -丁酸甲酯)(PTB7: PC70BM)基倒置体异质结有机太阳能电池的性能。制备了ITO/ ZnO/有源层/ MoO3 /Ag结构的光电器件,其中原初PTB7: PCBM有源层和不同SQ浓度的PTB7: PCBM: SQ有源层,并在100 mWcm−2的光照强度下测量了其J-V特性。详细分析了SQ的引入对PTB7: PCBM太阳能电池光伏参数的影响。记录了二元和三元共混物的紫外-可见-近红外吸收光谱,研究了三元共混物中SQ的不同添加量对其吸收的影响。用原子力显微镜分析了共混膜的形貌。研究……的影响
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引用次数: 1
Influence of temperature on the electrical properties of selenium thin films 温度对硒薄膜电性能的影响
Sunil Thomas, N. Qamhieh, S. Mahmoud
In the present study, selenium thin films of thickness ∼2.1 µm were synthesized using thermal evaporation method. The presence of selenium in the sample was confirmed using energy dispersive spectrum. Vibration analysis of the structural groups in the samples, before and after annealing, was carried out using Raman spectroscopy. The crystallization of the sample due to annealing was studied using X-ray diffraction. The change in the energy band gap of the film due to annealing was estimated from the Urbach edge of the absorption spectrum. Electrical properties namely conductance and capacitance at different voltages were investigated. Changes in the conductance and capacitance when heating the sample from room temperature to 400 K were studied.In the present study, selenium thin films of thickness ∼2.1 µm were synthesized using thermal evaporation method. The presence of selenium in the sample was confirmed using energy dispersive spectrum. Vibration analysis of the structural groups in the samples, before and after annealing, was carried out using Raman spectroscopy. The crystallization of the sample due to annealing was studied using X-ray diffraction. The change in the energy band gap of the film due to annealing was estimated from the Urbach edge of the absorption spectrum. Electrical properties namely conductance and capacitance at different voltages were investigated. Changes in the conductance and capacitance when heating the sample from room temperature to 400 K were studied.
本研究采用热蒸发法制备了厚度为~ 2.1µm的硒薄膜。利用能量色散谱法证实了样品中硒的存在。利用拉曼光谱对退火前后样品中的结构基团进行了振动分析。利用x射线衍射研究了样品的退火结晶。利用吸收光谱的乌尔巴赫边估计了退火后薄膜带隙的变化。研究了不同电压下的电导率和电容等电性能。研究了样品从室温加热到400k时电导和电容的变化。本研究采用热蒸发法制备了厚度为~ 2.1µm的硒薄膜。利用能量色散谱法证实了样品中硒的存在。利用拉曼光谱对退火前后样品中的结构基团进行了振动分析。利用x射线衍射研究了样品的退火结晶。利用吸收光谱的乌尔巴赫边估计了退火后薄膜带隙的变化。研究了不同电压下的电导率和电容等电性能。研究了样品从室温加热到400k时电导和电容的变化。
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引用次数: 2
S, N co-doped graphene quantum dots decorated ZnO nanorods for “Green” quantum dot sensitized solar cells S, N共掺杂石墨烯量子点修饰ZnO纳米棒用于“绿色”量子点敏化太阳能电池
T. Majumder, S. Dhar, P. Chakraborty, S. P. Mondal
In this article, we have synthesized N and S co-doped graphene quantum dots (SNGQDs) using low cost hydrothermal process. The particle size of SNGQDs is distributed within the range of 2-25 nm. Quantum dot sensitized solar cells (QDSSCs) were fabricated by attaching SNGQDs with ZnO nanorods grown on fluorine doped tin oxide (FTO) coated glass substrates. The SNGQDs sensitized ZnO NR photoanodes demonstrated power conversion efficiency ∼0.27%, which was 7 times higher than pristine ZnO nanorod based device.In this article, we have synthesized N and S co-doped graphene quantum dots (SNGQDs) using low cost hydrothermal process. The particle size of SNGQDs is distributed within the range of 2-25 nm. Quantum dot sensitized solar cells (QDSSCs) were fabricated by attaching SNGQDs with ZnO nanorods grown on fluorine doped tin oxide (FTO) coated glass substrates. The SNGQDs sensitized ZnO NR photoanodes demonstrated power conversion efficiency ∼0.27%, which was 7 times higher than pristine ZnO nanorod based device.
本文采用低成本水热法制备了氮、硫共掺杂石墨烯量子点(SNGQDs)。SNGQDs的粒径分布在2 ~ 25 nm范围内。将生长在氟掺杂氧化锡(FTO)镀膜玻璃衬底上的ZnO纳米棒与量子点敏化太阳能电池(QDSSCs)结合,制备了量子点敏化太阳能电池(QDSSCs)。SNGQDs敏化ZnO NR光阳极的功率转换效率为0.27%,是原始ZnO纳米棒器件的7倍。本文采用低成本水热法制备了氮、硫共掺杂石墨烯量子点(SNGQDs)。SNGQDs的粒径分布在2 ~ 25 nm范围内。将生长在氟掺杂氧化锡(FTO)镀膜玻璃衬底上的ZnO纳米棒与量子点敏化太阳能电池(QDSSCs)结合,制备了量子点敏化太阳能电池(QDSSCs)。SNGQDs敏化ZnO NR光阳极的功率转换效率为0.27%,是原始ZnO纳米棒器件的7倍。
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引用次数: 2
Observation of room temperature Raman, magnetic and ferroelectric response of (1 − x)NiCo2O4 − xBaTiO3 nanocomposites system (1−x)NiCo2O4−xBaTiO3纳米复合材料体系室温拉曼、磁和铁电响应的观察
S. Karmakar, B. Sahoo, D. Behera
{"title":"Observation of room temperature Raman, magnetic and ferroelectric response of (1 − x)NiCo2O4 − xBaTiO3 nanocomposites system","authors":"S. Karmakar, B. Sahoo, D. Behera","doi":"10.1063/1.5130316","DOIUrl":"https://doi.org/10.1063/1.5130316","url":null,"abstract":"","PeriodicalId":20725,"journal":{"name":"PROCEEDINGS OF THE INTERNATIONAL CONFERENCE ON ADVANCED MATERIALS: ICAM 2019","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88331133","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
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PROCEEDINGS OF THE INTERNATIONAL CONFERENCE ON ADVANCED MATERIALS: ICAM 2019
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