Structural change in <i>p</i>-type porous silicon by thermal annealing

Ogata, Yukio H.; Yoshimi, Naoki; Yasuda, Ryu; Tsuboi, Takashi; Sakka, Tetsuo; Otsuki, Akira

doi:10.1063/1.1416862

Cited by 84 publications

(48 citation statements)

References 25 publications

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“…We have studied the properties and performed materials characterization of the Si-ncs produced by this method for a number of years [17,18] and our results are also in good agreement with the extensive literature on porous silicon (e.g. [21][22][23] and see also Supporting Information in [15]; additional details on the average size and size distribution can also be found in the Supporting Material).…”

Section: Methodssupporting

confidence: 84%

A silicon nanocrystal/polymer nanocomposite as a down-conversion layer in organic and hybrid solar cells

et al. 2015

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Silicon nanocrystal (Si-nc) down-conversion is demonstrated to enhance organic and hybrid organic/inorganic bulk heterojunction solar cells based on PTB7:[70]PCBM bulk heterojunction devices. Surfactant free surface-engineered Si-ncs can be integrated into the device architecture to be optically active and provide a means of effective down-conversion of blue photons (high energy photons below ∼450 nm) into red photons (above ∼680 nm) leading to 24% enhancement of the photocurrent under concentrated sunlight. We also demonstrate that the down-conversion effect under 1-sun is enhanced in the case of hybrid solar cells where engineered Si-ncs are also included in the active layer.

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Section: Methodssupporting

confidence: 84%

A silicon nanocrystal/polymer nanocomposite as a down-conversion layer in organic and hybrid solar cells

et al. 2015

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“…The remaining peak at 73.328 with relatively low intensity, as shown by star in Fig. 3 might be assigned to the diamond cubic structure of silicon [25]. The presence of silicon as impurity in epoxy/Sn composites has already been evidenced in the EDX of epoxy/ Sn27 vol% in Fig.…”

Section: Structural Characterization By Sem and Xrd Analysesmentioning

confidence: 78%

Thermal degradation mechanisms of epoxy composites filled with tin particles

et al. 2015

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This article reports an evaluation study of the thermal degradation mechanisms of electrically insulating and conducting epoxy/Sn composites by using solid-state kinetic approaches and structural characterizations.Comparison of the thermoanalytical data of epoxy/Sn composites with pure epoxy shows that the addition of tin in epoxy catalyzes the thermal degradation of epoxy and the catalytic ability of tin depends upon its contents in epoxy. Kinetic modeling of the phenomena elaborates the thermal behaviors of epoxy/Sn composites in terms of the comparison of their activation parameters and reaction models. Friedman's differential and ArshadMaaroufi's generalized linear integral isoconversional methods are used to obtain the variation in activation energies with the advancement of reaction. Advanced reaction model determination methodology is effectively employed to evaluate the reaction mechanisms of epoxy/Sn composites. Kinetic analysis suggests that tin increases the thermal degradation rate of epoxy by lowering the activation energy barrier of reaction. It is worth noticing that the parameters of the probable reaction model, i.e., Sest ak Berggren have been found nearly the same for pure epoxy and epoxy/Sn composites, revealing weak epoxy-tin interactions in the composites. The mechanistic information obtained by kinetic analysis fairly agrees with the scanning electron microscopy and X-ray diffraction results.

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“…Figure a and b show different regions of the FTIR spectra with signatures of different bonding arrangements for all three different samples, unprocessed, DC‐microplasma treated and RF‐microplasma treated. We know that SiNCs produced by electrochemical etching are mostly terminated by hydrogen and at the same time Si‐dimers and dangling bonds may be present . The processing conditions affect the degree and the type of surface passivation.…”

Section: Resultsmentioning

confidence: 99%

Microplasma‐Induce Liquid Chemistry for Stabilizing of Silicon Nanocrystals Optical Properties in Water

Mitra

Švrček

Mariotti

et al. 2013

Plasma Processes & Polymers

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In this report, we demonstrate stabilization of photoluminescence (PL) properties of environmentally and biologically friendly silicon nanocrystals (SiNCs) in water through atmospheric pressure radio‐frequency (RF) microplasma processing at room temperature. The PL of the SiNCs is enhanced after microplasma processing, which involves three‐dimensional engineering of SiNCs directly in water avoiding degradation by surface functionalization. Moreover, we compare the RF microplasma process with direct‐current microplasma processing, whereby the two approaches lead to very similar SiNCs optical properties and surface characteristics. The induced unique chemistry and SiNCs stability in water have wide implications for the SiNCs processability and applications in energy devices, biology and medicine.

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Structural change in p-type porous silicon by thermal annealing

Cited by 84 publications

References 25 publications

A silicon nanocrystal/polymer nanocomposite as a down-conversion layer in organic and hybrid solar cells

A silicon nanocrystal/polymer nanocomposite as a down-conversion layer in organic and hybrid solar cells

Thermal degradation mechanisms of epoxy composites filled with tin particles

Microplasma‐Induce Liquid Chemistry for Stabilizing of Silicon Nanocrystals Optical Properties in Water

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