Optical and electrical properties of thin wafers fabricated from nanocrystalline silicon powder

Kononov, N. N.; Kuzmin, G. P.; Orlov, A. N.; Surkov, Anton A.; Tikhonevich, O. V.

doi:10.1134/1.1992644

Cited by 10 publications

(7 citation statements)

References 16 publications

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“…In papers (Wovchko at al., 1995;Stuart, 2004) this band is attributed to O-H vibrations in hydrogen bound hydroxyl groups. It was also shown that heating of nc-Si particles to 400°C causes an appreciably decrease in the intensity of the band near 3420 cm -1 and an increase in the intensity of the narrow band with a maximum near 3750 cm -1 , which is identified with ( Kononov at al., 2005). Similar spectra are shown in Figure 13.…”

Section: Proton Conductivity Of Films Imentioning

confidence: 58%

“…The nc-Si films were deposited from silicon nanoparticles produced by CO 2 laser pyrolysis of silane. The system for synthesis of the nc-Si powders and conditions of the process are described in detail elsewhere (Kononov at al., 2005;Kuz'min at al., 2000). In what follows, we briefly outline the procedure of synthesis of the Si nanoparticles.…”

Section: Samples and Measurement Proceduresmentioning

confidence: 99%

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Smart Nanoparticles Technology

2012

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is currently working as Head Director of Education Scheme for Training and Developments (ES4TD) British Company. The company is establishing itself in the market of supporting the scientific research and university education programs development. The company has been set up a few years ago. It is well known in the UK and Middle East and has a lot of university and company partners. Within his duties and commitments in this company, Dr. Hashim is in charge of running the research programs of Environmental Pollution Research Group (EPRG), Nanotechnology Research Group (NTRG) and Materials for Engineering Applications Research Group (MEARG). In these fields of research Dr. Hashim published many papers and research reports. He is the editor of more than six books published by InTech Open Access Publisher and a member of many journal editorial boards. ContentsPreface XIII Part Metallic Nanoparticles 1 Chapter Metallic Nanoparticles Coupled with Photosynthetic Complexes 3 Sebastian Mackowski Chapter Hollow Nano Silica: Synthesis, Characterization and Applications 29 N. Venkatathri Chapter Synthesis of Titanate and Titanium Dioxide Nanotube Thin Films and Their Applications to Biomaterials 41 Mitsunori Yada and Yuko Inoue Chapter Self-Organization of Silver-Core Bimetallic Nanoparticles and Their Application for Catalytic Reaction 67 Kazutaka Hirakawa Chapter Utilization of Nanoparticles Produced by Aqueous-Solution Methods -Formation of Acid Sites on CeO 2 -TiO 2 Composite and 1-D TiO 2 for Dye-Sensitized Solar Cells 93

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Section: Proton Conductivity Of Films Imentioning

confidence: 58%

Section: Samples and Measurement Proceduresmentioning

confidence: 99%

Smart Nanoparticles Technology

2012

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“…Previously, in the investigations of IR transmission spectra of thin wafers (with thickness ≈50 m) made by pressing (P~10 9 Pa) from nc-Si powders similar to those used in this study, it was shown that the spectra contain a broad intense band with a maximum at ~3420 cm -1 (see Fig. 13 and Kononov at al., 2005). In papers (Wovchko at al., 1995;Stuart, 2004) this band is attributed to O-H vibrations in hydrogen bound hydroxyl groups.…”

Section: Proton Conductivity Of Films Imentioning

confidence: 67%

Dielectric and Transport Properties of Thin Films Deposited from Sols with Silicon Nanoparticles

Nickolay¹,

Sergey²

2012

Smart Nanoparticles Technology

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Recently, we showed that homogeneous thin films (with a thickness up to 30 nm) can be grown by size selective precipitation sols containing nanocrystalline silicon particles (Dorofeev at al., 2009). Such films (nc-Si) are formed by closely adjacent crystalline Si nanoparticles; therefore, their physical characteristics to a certain extent should be similar to characteristics of films based on porous silicon (por-Si). The optical absorption and photoluminescence ability of por-Si films have been very comprehensively studied to date (see, e.g., Kovalev at al., 1996;; however, the number of studies of transport www.intechopen.com

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“…To produce the solutions consisting of TANI-ES and silicon nanoparticle (nc-Si) composites, we used nanoparticles synthesized by laser-induced pyrolysis of silane. 22 The average diameter of nc-Si was 15 nm, with a shell of SiO x (0 ≤ x ≤ 2) approximately 1 nm thick. To prepare the composite solution, the ethanol solution of TANI-ES with a concentration of 0.5 mg/mL was added to the dispersion of Si nanoparticles (concentration 0.05 mg/mL) at a volume ratio of 1:100.…”

Section: Methodsmentioning

confidence: 99%

Phase Transition in a Tetraaniline/Nanosilicon Composite Film Detected by Impedance Spectroscopy

Kononov,

Yagudaeva,

Voronov

et al. 2023

J. Phys. Chem. C

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The composite films of phenyl/phenyl end-capped tetraaniline emeraldine salt (TANI-ES) and nanocrystalline silicon (nc-Si) TANI-ES/nc-Si were obtained using a drop-casting method by deposition from the solutions onto the substrates with metal electrodes. A comprehensive analysis of the impedance spectra of the TANI-ES/nc-Si composite film at the temperature range of 20−130 °C has been carried out. For the first time, it was found that there are two temperature ranges in which the impedance spectra are completely different. At the border of these ranges at temperature T* ≈ 101.5 °C, the impedance spectra exhibit a pronounced inductive character. Differential scanning calorimetry (DSC) measurements showed that two phase transitions occur in the TANI-ES/nc-Si composite at temperatures of 94 and 145 °C. An analysis of X-ray diffraction patterns revealed that the crystal structure of the TANI-ES/nc-Si composite is unstable upon heating to 140 °C in a nitrogen atmosphere, and the degree of this instability depends on the ratio of the number of TANI molecules per one nanoparticle. The temperature dependence of the DC conductivity changes sharply at a temperature of about 100 °C. The temperature dependences of the fitting parameters used to fit the experimental impedance curves also change significantly at 100 °C. Such changes in the electrical characteristics can be explained by a second-order phase transition in the TANI-ES/nc-Si composite at temperatures of about 100 °C. The Nyquist plot of the impedance of the TANI-ES/nc-Si composite has an inductive character at T* ≈ 101.5 °C, and we believe that such a character may indicate a phase transition in this composite. The conductivity spectra of the TANI-ES/nc-Si film at all investigated temperatures, except for 101.5 °C, are well approximated by the sum of the power law, polaron, and DC conductivities. However, the film conductivity at T* ≈ 101.5 °C has a local maximum at about 10 Hz, and this maximum cannot be approximated by standard functions used in impedance spectroscopy to fit conductivity curves in the RF region. It has been shown for the first time that a good approximation is the Drude−Smith formula, which has been successfully used to approximate conductivity spectra in the terahertz range of the spectrum. An exact approximation of the spectra ε′(ν) and ε″(ν) in the entire temperature range, except for temperature T*, is achieved by a combination of the Debye and Cole−Cole functions and the component determined by free charges. At temperature T*, in order to approximate the spectra ε′(ν) and ε″(ν), in addition to the indicated combination of functions, it is also necessary to use the Drude−Smith function.

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Optical and electrical properties of thin wafers fabricated from nanocrystalline silicon powder

Cited by 10 publications

References 16 publications

Smart Nanoparticles Technology

Smart Nanoparticles Technology

Dielectric and Transport Properties of Thin Films Deposited from Sols with Silicon Nanoparticles

Phase Transition in a Tetraaniline/Nanosilicon Composite Film Detected by Impedance Spectroscopy

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