Formation and characterization of porous silicon films obtained by catalyzed vapor-chemical etching

Díaz-Torres, E.; Romero-Paredes, G.; Peña‐Sierra, R.; Ávila-García, A.

doi:10.1016/j.mssp.2015.07.024

Cited by 17 publications

(6 citation statements)

References 18 publications

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“…Figures 2 and 3 show two scanning electron microscopy (SEM) microphotographs of the typical PS surface samples. Figure 4 shows the PL spectrum produced by the PS films; the luminescence excited by a UV lamp is of darkred color with its maximum located at the wavelength of 661 nm with a full width at half maximum (FWHM) of 168 nm, the PL spectra is similar to the ones reported elsewhere [12]. The intense and stable PL response has been well justified by quantum confinement effects produced by the nanocrystallites constituting the PS films [13].…”

Section: Resultssupporting

confidence: 59%

Electrical transport phenomena in nanostructured porous-silicon films

2018

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The charge transport mechanisms in nanostructured porous silicon (PS) films were studied through current-voltage (I-V) measurements of planar Au/PS/Au structures at 300 K. The films were formed by electrochemical etching of 1-5 Ω-cm p-type Si (100) wafers producing PS layers of 4.48 x 109 Ω-cm. The charge transport is limited both by the space charge limited currents (SCLC) and the carrier trapping-detrapping kinetics in the inherent localized PS energy levels. I-V characteristics evolve according to the trapping-detrapping carrier kinetics in the PS films showing that the electrical current can be controlled by applying external electric fields. An equivalent trap filling limiting voltage (VTFL) was identified that shifts between 1 and 3 volts by the carrier trapping-detrapping kinetics from the PS intrinsic defect states. An energy band diagram for the PS films is schematically depicted including the influence of the intrinsic PS defect states. To give a reasonable explanation of the found behavior the existence of a thin silicon oxide film covering the network-like-silicon-nanocrystallites is required, in agreement with the widely accepted PS structural models.

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Section: Resultssupporting

confidence: 59%

Electrical transport phenomena in nanostructured porous-silicon films

2018

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“…Studies have been reported to synthesize porous silicon with various methods such as wet etching [17][18][19] , chemical de-alloying [20][21][22][23] , templating synthesis 24 , and magnesiothermic reduction [25][26][27] .…”

Section: Introductionmentioning

confidence: 99%

“…Studies have been reported to synthesize porous silicon with various methods such as wet etching, − chemical de-alloying, − templating synthesis, and magnesiothermic reduction. − Nevertheless, the use of toxic or expensive materials and/or the sophisticated and time-consuming assembly process makes the former three methods difficult to scale up. Magnesiothermic reduction has been demonstrated to be a facile method for the bulk synthesis of porous silicon with varying degrees of structural control. ,− …”

Section: Introductionmentioning

confidence: 99%

Rational Design and Mechanical Understanding of Three-Dimensional Macro-/Mesoporous Silicon Lithium-Ion Battery Anodes with a Tunable Pore Size and Wall Thickness

Zuo

Wen

Qiu

et al. 2020

ACS Appl. Mater. Interfaces

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Silicon is regarded as one of the most promising next generation lithium-ion battery anodes due to its exceptional theoretical capacity, appropriate voltage profile and vast abundance. Nevertheless, huge volume expansion and drastic stress generated upon lithiation cause poor cyclic stability. It has been one of the central issues to improve cyclic performance of silicon based lithium-ion battery anodes.Constructing hierarchical macro-/mesoporous silicon with tunable pore size and wall thickness is developed to tackle this issue. Rational structure design, controllable synthesis and theoretical mechanical simulation are combined together to reveal fundamental mechanisms responsible for an improved cyclic performance.A self-templating strategy is applied using Stöber silica particles as templating agent and precursor, coupled with a magnesiothermic reduction process. Systematic variation of the magnesiothermic reduction time allows a good control over the structures of the porous silicon. Finite element mechanical simulations on the porous silicon show that an increased pore size and a reduced wall thickness generate less mechanical stress in average along with an extended lithiation state. Besides the mechanical stress, the evolution of strain and displacement of the porous silicon is also elaborated with the finite element simulation.

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“…The porous silicon is mainly synthesized by wet etching of silicon wafers, − chemical dealloying, − and templating synthesis . Nevertheless, these synthetic methods may need to use significant amounts of toxic chemicals (such as hydrofluoric acid) or expensive starting materials (for example, silver).…”

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confidence: 99%

Self-Templating Construction of 3D Hierarchical Macro-/Mesoporous Silicon from 0D Silica Nanoparticles

et al. 2016

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Porous silicon has found wide applications in many different fields including catalysis and lithium-ion batteries. Three-dimensional hierarchical macro-/mesoporous silicon is synthesized from zero-dimensional Stöber silica particles through a facile and scalable magnesiothermic reduction process. By systematic structure characterization of the macro-/mesoporous silicon, a self-templating mechanism governing the formation of the porous silicon is proposed. Applications as lithium-ion battery anode and photocatalytic hydrogen evolution catalyst are demonstrated. It is found that the macro-/mesoporous silicon shows significantly improved cyclic and rate performance over the commercial nanosized and micrometer-sized silicon particles. After 300 cycles at 0.2 A g, the reversible specific capacity is still retained as much as 959 mAh g with a high mass loading density of 1.4 mg cm. With the large current density of 2 A g, a reversible capacity of 632 mAh g is exhibited. The coexistence of both macro- and mesoporous structures is responsible for the enhanced performance. The macro-/mesoporous silicon also shows superior catalytic performance for photocatalytic hydrogen evolution compared to the silicon nanoparticles.

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Formation and characterization of porous silicon films obtained by catalyzed vapor-chemical etching

Cited by 17 publications

References 18 publications

Electrical transport phenomena in nanostructured porous-silicon films

Electrical transport phenomena in nanostructured porous-silicon films

Rational Design and Mechanical Understanding of Three-Dimensional Macro-/Mesoporous Silicon Lithium-Ion Battery Anodes with a Tunable Pore Size and Wall Thickness

Self-Templating Construction of 3D Hierarchical Macro-/Mesoporous Silicon from 0D Silica Nanoparticles

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