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Understanding the Vapor-Liquid-Solid and Vapor-Solid-Solid Mechanisms of Si Nanowire Growth to Synthetically Encode Precise Nanoscale Morphology.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Understanding the Vapor-Liquid-Solid and Vapor-Solid-Solid Mechanisms of Si Nanowire Growth to Synthetically Encode Precise Nanoscale Morphology./
Author:	Pinion, Christopher William.
Description:	1 online resource (133 pages)
Notes:	Source: Dissertations Abstracts International, Volume: 79-04, Section: B.
Contained By:	Dissertations Abstracts International79-04B.
Subject:	Physical chemistry. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=10605258click for full text (PQDT)
ISBN:	9780355180145

Understanding the Vapor-Liquid-Solid and Vapor-Solid-Solid Mechanisms of Si Nanowire Growth to Synthetically Encode Precise Nanoscale Morphology.
Pinion, Christopher William.

Understanding the Vapor-Liquid-Solid and Vapor-Solid-Solid Mechanisms of Si Nanowire Growth to Synthetically Encode Precise Nanoscale Morphology. - 1 online resource (133 pages)

Source: Dissertations Abstracts International, Volume: 79-04, Section: B.

Thesis (Ph.D.)--The University of North Carolina at Chapel Hill, 2017.

Includes bibliographical references

Precise patterning of semiconductor materials utilizing top-down lithographic techniques is integral to the advanced electronics we use on a daily basis. However, continuing development of these lithographic technologies often results in the trade-off of either high cost or low throughput, and three-dimensional (3D) patterning can be difficult to achieve. Bottom-up, chemical methods to control the 3D nanoscale morphology of semiconductor nanostructures have received significant attention as a complementary technique. Semiconductor nanowires, nanoscale filaments of semiconductor material ~10-500 nm in diameter and ~1-50 microns in length, are an especially promising platform because the wire composition can be modulated during growth and the high aspect ratio, one-dimensional structure enables integration in a range of devices. In this thesis, we first report a bottom-up method to break the conventional "wire" symmetry and synthetically encode a high-resolution array of arbitrary shapes along the nanowire growth axis. Rapid modulation of phosphorus doping combined with selective wet-chemical etching enables morphological features as small as 10 nm to be patterned over wires more than 50 ?m in length. Next, our focus shifts to more fundamental studies of the nanowire synthetic mechanisms. We presented comprehensive experimental measurements on the growth rate of Au catalyzed Si nanowires and developed a kinetic model of vapor-liquid-solid growth. Our analysis revealed an abrupt transition from a diameter-independent growth rate that is limited by incorporation to a diameter-dependent growth rate that is limited by crystallization. While investigating the vapor-liquid-solid mechanism, we noticed instances of unique catalyst behavior. Upon further study, we showed that it is possible to instantaneously and reversibly switch the phase of the catalyst between a liquid and superheated solid state under isothermal conditions above the eutectic temperature. The solid catalyst induces a vapor-solid-solid growth mechanism, which provides atomic-level control of dopant atoms in the nanowire. Finally, we explored a promising application of nanowires by investigating the potential for complex silicon nanowires to serve as a platform for next-generation photovoltaic devices. We reviewed the synthesis, electrical, and optical characteristics of core/shell Si nanowires that are sub-wavelength in diameter and contain radial p-n junctions. We highlighted the unique features of these nanowires, such as optical antenna effects that concentrate light and intense built-in electric fields that enable ultrafast charge-carrier separation. Based on these observations we advocate for a paradigm in which nanowires are arranged in periodic horizontal arrays to form ultrathin devices.

Electronic reproduction.
Ann Arbor, Mich. :
ProQuest,
2023

Mode of access: World Wide Web

ISBN: 9780355180145Subjects--Topical Terms:

1981412
Physical chemistry.
Subjects--Index Terms:

Semiconductor materialsIndex Terms--Genre/Form:

542853
Electronic books.

Understanding the Vapor-Liquid-Solid and Vapor-Solid-Solid Mechanisms of Si Nanowire Growth to Synthetically Encode Precise Nanoscale Morphology.
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500 $a Publisher info.: Dissertation/Thesis.
500 $a Advisor: Cahoon, James F.
502 $a Thesis (Ph.D.)--The University of North Carolina at Chapel Hill, 2017.
504 $a Includes bibliographical references
520 $a Precise patterning of semiconductor materials utilizing top-down lithographic techniques is integral to the advanced electronics we use on a daily basis. However, continuing development of these lithographic technologies often results in the trade-off of either high cost or low throughput, and three-dimensional (3D) patterning can be difficult to achieve. Bottom-up, chemical methods to control the 3D nanoscale morphology of semiconductor nanostructures have received significant attention as a complementary technique. Semiconductor nanowires, nanoscale filaments of semiconductor material ~10-500 nm in diameter and ~1-50 microns in length, are an especially promising platform because the wire composition can be modulated during growth and the high aspect ratio, one-dimensional structure enables integration in a range of devices. In this thesis, we first report a bottom-up method to break the conventional "wire" symmetry and synthetically encode a high-resolution array of arbitrary shapes along the nanowire growth axis. Rapid modulation of phosphorus doping combined with selective wet-chemical etching enables morphological features as small as 10 nm to be patterned over wires more than 50 ?m in length. Next, our focus shifts to more fundamental studies of the nanowire synthetic mechanisms. We presented comprehensive experimental measurements on the growth rate of Au catalyzed Si nanowires and developed a kinetic model of vapor-liquid-solid growth. Our analysis revealed an abrupt transition from a diameter-independent growth rate that is limited by incorporation to a diameter-dependent growth rate that is limited by crystallization. While investigating the vapor-liquid-solid mechanism, we noticed instances of unique catalyst behavior. Upon further study, we showed that it is possible to instantaneously and reversibly switch the phase of the catalyst between a liquid and superheated solid state under isothermal conditions above the eutectic temperature. The solid catalyst induces a vapor-solid-solid growth mechanism, which provides atomic-level control of dopant atoms in the nanowire. Finally, we explored a promising application of nanowires by investigating the potential for complex silicon nanowires to serve as a platform for next-generation photovoltaic devices. We reviewed the synthesis, electrical, and optical characteristics of core/shell Si nanowires that are sub-wavelength in diameter and contain radial p-n junctions. We highlighted the unique features of these nanowires, such as optical antenna effects that concentrate light and intense built-in electric fields that enable ultrafast charge-carrier separation. Based on these observations we advocate for a paradigm in which nanowires are arranged in periodic horizontal arrays to form ultrathin devices.
533 $a Electronic reproduction. $b Ann Arbor, Mich. : $c ProQuest, $d 2023
538 $a Mode of access: World Wide Web
650 4 $a Physical chemistry. $3 1981412
653 $a Semiconductor materials
653 $a Three-dimensional patterning
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690 $a 0494
710 2 $a ProQuest Information and Learning Co. $3 783688
710 2 $a The University of North Carolina at Chapel Hill. $b Chemistry. $3 1021872
773 0 $t Dissertations Abstracts International $g 79-04B.
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=10605258 $z click for full text (PQDT)