Vectorial nanowire growth by local kinetic manipulation

Lee, Geunhee; Woo, Yun Sung; Yang, Jee Eun; Kim, Gil Sung; Lee, Donghun; Kang, Kibum; Kim, Cheol‐Joo; Jo, Moon Ho

doi:10.1016/j.jcrysgro.2012.01.054

Cited by 2 publications

(5 citation statements)

References 30 publications

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“…A larger gradient is also favorable for the enhancement of nanowire growth rate. [6,7] Figure 8b lists a few practical cooling approaches demonstrated in this article that can realize a sufficient temperature gradient profile, including HGF cooling, program controlled cooling profile, and heat sink attachment, which can be extended to the synthesis of other SLS-derived nanowires.…”

Section: Resultsmentioning

confidence: 99%

“…Jo et al had demonstrated that a larger positive temperature gradient can promote VLSderived nanowire growth in terms of length. [6,7] The substrate has to be cooled to create the positive temperature gradient from the bottom to the top for the nanowire growth with fast kinetics. [6,7] However, under the SLS process, the supply of nanowire source material is from the bottom (bulk solid substrate in SLS) instead of the top (gaseous precursor in VLS), so we assumed that the essential profile of temperature gradient for the SLS synthesis could be very different from that required for the VLS mechanism.…”

Section: Resultsmentioning

confidence: 99%

“…[6,7] The substrate has to be cooled to create the positive temperature gradient from the bottom to the top for the nanowire growth with fast kinetics. [6,7] However, under the SLS process, the supply of nanowire source material is from the bottom (bulk solid substrate in SLS) instead of the top (gaseous precursor in VLS), so we assumed that the essential profile of temperature gradient for the SLS synthesis could be very different from that required for the VLS mechanism. Figure 2a gives the temperature difference between the programmed temperature and the measured temperature by the portable thermalcouple, and a smaller temperature difference can be obtained under high gas flow (HGF), indicating a relatively closer temperature value to the originally designed thermal condition.…”

Section: Resultsmentioning

confidence: 99%

“…[3,4] The VLS-derived nanowires will keep growing if the following conditions can be met at the same time: 1) An adequate supply of nanowire material source, 2) a sufficiently high local temperature around the eutectic interface, and 3) an appropriate positive temperature gradient above the substrate. [5][6][7] Most of the time, gold nanoparticles were utilized as the catalyst for the VLS-derived Si nanowires (SiNWs) due to the low eutectic point of Au-Si system. [8][9][10] Alternative catalytic materials such as silver, nickel, copper, iron, lead, aluminum, and titanium may also serve the needs of the VLS production of SiNWs since they can form eutectic melts with silicon below their respective melting points.…”

Section: Introductionmentioning

confidence: 99%

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Economical Silicon Nanowire Growth via Cooling Controlled Solid–Liquid–Solid Mechanism

Nguyen

Hsu

Lien

2022

Adv Materials Inter

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Conventional vapor–liquid–solid mechanism of nanowire growth opens up new opportunities of fabricating nanowires with controllable morphologies and aspect ratios. However, gaseous precursors have disadvantages of high material and processing cost, high toxicity, and limited scalability. By contrast, synthesizing nanowires via solid–liquid–solid mechanism could be a facile alternative since the low cost and nontoxic solid precursor is adopted in the process. In this study, the cooling control is found to be very critical for the solid–liquid–solid nanowire growth. Without a sufficient negative vertical temperature gradient, the nucleation and continuous growth of silicon nanowires could not occur. High volume gas flow cooling, fluctuating the heating temperature, decreasing the cooling rate, and applying a heat sink are all efficacious to promote silicon nanowire formation. In addition to the nanowires formed under high gas flow cooling on the silicon wafer sputtered with a nickel thin film, the solid–liquid–solid mechanism‐derived silicon nanowire growth can also be economically achieved by adopting a solution‐based coating of a nickel precursor onto the silicon substrate paired with a programmed slow cooling condition without using any gas, which could be transferred to other eutectic systems for cost‐effective nanomaterial fabrication.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Economical Silicon Nanowire Growth via Cooling Controlled Solid–Liquid–Solid Mechanism

Nguyen

Hsu

Lien

2022

Adv Materials Inter

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“…Future work on the growth of vertical SiNWs on low‐cost substrates, with techniques such as growth in a temperature gradient or guided growth within anodic alumina template , as well as studies of alternative catalysts with lower eutectic temperature with silicon , are expected to provide a possible solution for the fabrication of SiNW solar cells on low‐cost substrates.…”

Section: Discussionmentioning

confidence: 99%