Pencil-shaped silicon nanowire synthesis and photovoltaic application

Jevasuwan, Wipakorn; Chen, Junyi; Subramani, Thiyagu; Pradel, Ken C.; Takei, Toshiaki; Dai, Kotaro; Shinotsuka, Kei; Hatta, Y.; Fukata, Naoki

doi:10.7567/jjap.56.085201

Cited by 15 publications

(10 citation statements)

References 31 publications

(68 reference statements)

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“…While a pure cylinder shape appears most preferable for transport studies, a cone shape (tapered nanowire) allows a better extraction of the light from an embedded quantum dot [1][2][3][4] , and the pencil shape, with a long thick cylinder and a strong tapering isolated near the nanowire tip 5 ("P" in Fig. 1a) may be preferable for a better light collection in photovoltaic devices 6,7 . Similar shapes and sizes have been demonstrated for different systems in spite of large differences in the material parameters, for instance ZnTe and InP with orders of magnitudes difference in the diffusion length along the nanowire 8 .…”

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confidence: 99%

The onset of tapering in the early stage of growth of a nanowire

Gosain¹,

Bellet‐Amalric²,

Hertog³

et al. 2022

Nanotechnology

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The early stage of growth of semiconductor nanowires is studied in the case where the sidewall adatoms have a short diﬀusion length due to a strong desorption. Experimental results are described for the growth of ZnSe nanowires by molecular beam epitaxy. They are discussed using the Burton-Cabrera-Frank description of the propagation of steps along the sidewalls, and compared to other II-VI and III-V nanowires. The role of the growth parameters and the resulting shape of the nanowires (cylinder, cone, or both combined) are highlighted.

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confidence: 99%

The onset of tapering in the early stage of growth of a nanowire

Gosain¹,

Bellet‐Amalric²,

Hertog³

et al. 2022

Nanotechnology

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“…A master mold of the line/dot structure was fabricated at the surface of a 6-inch-diameter Si wafer by combining conventional colloidal lithography and photolithography methods to fabricate a nanostructure consisting of multiple nanopillar and planar regions alternately arranged in a striped pattern (15,16).…”

Section: Materials and Methods 2 − 1 Cell Culture Substratesmentioning

confidence: 99%

Induction of Anisotropic Orientation and Enhancement of Gene Functional Expression of Human Pluripotent Stem Cell-Derived Cardiomyocytes Cultured on Nanofabricated Substrates Consisting of Micron Planar Lines and Nano Dot Structures.

Tokuno

Dai

Shinotsuka

2021

Preprint

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Human-induced pluripotent stem cell-derived cardiomyocytes (hiPS-CMs) are expected to have applications in the fields of regenerative medicine and drug discovery. However, the immaturity of hiPS-CMs is an issue to be considered, and in order to replicate in vivo responsivity, there have been several attempts to induce maturation in hiPS-CMs, including methods to induce differentiation of hiPS-CMs by changing culture medium and culture substrate. In particular, anisotropic culture, in which the cultured cells are aligned in one direction, induces the cellular morphology resembling that of in vivo cardiomyocytes and is expected to be a useful method for maturation of hiPS-CMs. We tried forming a nanostructure on the surface of the cell culture substrate using our original nanofabrication technology, with the aim of aligning cardiomyocytes and inducing maturation. Our newly developed nanostructure for anisotropic culture (line/dot structure) comprises a region of cone-shaped nanopillars with pitch distance of several hundred nm and a planar region, alternating in a striped pattern with intervals of several tens of µm, arranged on the surface of the cell culture substrate. The hiPS-CMs cultured using the line/dot structure showed anisotropic orientation, and increased mRNA expression was observed in myocardial structural protein genes, genes relating to ion channels, and the gene for Cx43. These results suggest that the line/dot nanostructure is effective for anisotropic culture and cell maturation of hiPS-CMs.

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“…Si nanowire (NW) structures have attracted considerable attention for their ability to increase light trapping and minimize spectral mismatch and optical loss, thereby enhancing solar cell performance. This is due to their unique physical, optical, and electrical characteristics, which include efficient light absorption, a large interface area, and a short charge separation distance. − Various methods exist for the formation of Si NWs, including laser ablation, − vapor–liquid–solid (VLS) growth using chemical vapor deposition (CVD), − metal-catalyst electroless etching (MCEE), − and nanoimprinting − or colloidal lithography, − followed by reactive ion etching. Of these methods, the VLS technique is of particular interest for processing thin Si substrates due to its effectiveness in simply providing a high density of single-crystalline Si NWs, with the additional benefit of scalability to large-scale manufacturing.…”

Section: Introductionmentioning

confidence: 99%

Paper-Thin Al-Catalyzed Si Nanowire Solar Cells and Efficiency Enhancement by Hybrid Nanostructures with Mn-Doped Perovskite Nanocrystals

Jevasuwan

Abdelbar

Jeco-Espaldon

et al. 2023

ACS Appl. Energy Mater.

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The use of thin silicon (Si) wafers and streamlined fabrication methods that can be scaled up without compromising device efficiency is a key strategy for realizing low-cost and flexible solar cells. Herein, aluminum (Al)-catalyzed Si nanowires (NWs) formed by vapor–liquid–solid growth on paper-thin polished and etched Si(111) wafers of 100 and 60 μm thickness with high proficiency for minimizing interfacial defects and light absorption loss have been accomplished. Successfully addressing the major challenge of rapid Al catalyst oxidation by ex situ and uncomplicated growth conditions allows for the potential to scale up the process while preventing the formation of deep-level traps resulting from catalyst contamination. The Si NWs formed on the nanowave surface of a thin etched Si wafer evidence comparable light absorbance and low interfacial defects to those grown on thin polished and traditional Si wafers. Fabrication of thin Si NW solar cells with a homojunction p+–p–n–n+ structure toward the enhanced power conversion efficiency (PCE) by hybrid nanostructures with manganese-doped cesium lead chloride (CsPb0.81Mn0.19Cl3) perovskite nanocrystals (NCs) using a simple drop-casting method has been explicitly explained. The precise tuning of the energy band and NC size enabled a significant radiative energy transfer by matching the light absorption range of NCs with a high Stokes shift in the luminescence spectrum and the spectral response range of underlying Si solar cells. The nonradiative energy transfer efficiency of NCs and an NC amount infiltration on homojunction Si NW solar cells for maximizing PCE enhancement were examined. The effective photon-harvesting architectures of NWs and NCs together with efficient energy transfers and surface passivation from NCs to the underlying homojunction Si NW solar cells could capably enhance PCE up to a 9% level. These results exhibited the potential for feasible low-cost and large-scale fabrication techniques with lower consumption of raw materials for future photovoltaic applications.

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Pencil-shaped silicon nanowire synthesis and photovoltaic application

Cited by 15 publications

References 31 publications

The onset of tapering in the early stage of growth of a nanowire

The onset of tapering in the early stage of growth of a nanowire

Induction of Anisotropic Orientation and Enhancement of Gene Functional Expression of Human Pluripotent Stem Cell-Derived Cardiomyocytes Cultured on Nanofabricated Substrates Consisting of Micron Planar Lines and Nano Dot Structures.

Paper-Thin Al-Catalyzed Si Nanowire Solar Cells and Efficiency Enhancement by Hybrid Nanostructures with Mn-Doped Perovskite Nanocrystals

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