東華大學圖書館 |

語系: 繁體中文

說明(常見問題)

回圖書館首頁

手機版館藏查詢

登入

回首頁

切換: 標籤 | MARC模式 | ISBD

Manipulation and Enhancement of Exci...

Tyson, Kurt Henry,

FindBook

Google Book

Amazon

博客來

Manipulation and Enhancement of Excitonic Optical Spectroscopy in Two-Dimensional Semiconductors /

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Manipulation and Enhancement of Excitonic Optical Spectroscopy in Two-Dimensional Semiconductors // Kurt Henry Tyson.
作者:	Tyson, Kurt Henry,
面頁冊數:	1 electronic resource (217 pages)
附註:	Source: Dissertations Abstracts International, Volume: 86-07, Section: B.
Contained By:	Dissertations Abstracts International86-07B.
標題:	Crystal structure. -
電子資源:	https://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=31822582
ISBN:	9798302371218

Manipulation and Enhancement of Excitonic Optical Spectroscopy in Two-Dimensional Semiconductors /
Tyson, Kurt Henry,

Manipulation and Enhancement of Excitonic Optical Spectroscopy in Two-Dimensional Semiconductors /Kurt Henry Tyson. - 1 electronic resource (217 pages)

Source: Dissertations Abstracts International, Volume: 86-07, Section: B.

Two-dimensional materials present a promising foundation for developing next-generation ultrathin, flexible, and durable optoelectronic devices. Amongst the family of 2D materials, semiconducting monolayer MoS2has garnered immense attention due to its direct bandgap with emissions in the visible light spectrum. Not only does this pave the way towards atomically thin photodetectors, emitters, and switches, but the high excitonic binding energies at room temperature provide a promising platform to explore novel physical phenomena such as exciton-plasmon polaritons. Unfortunately, MoS2suffers from low photoluminescence quantum yield (PLQY), where non-radiative recombination pathways compete with the radiative recombination of excitons. This leads to an extensive reduction in light emission efficiency (0.01-0.6%). Inherent defect sites, vacancies, and charge carrier density contribute to decreased PLQY, but the underlying mechanisms are heavily debated. In this work, we investigate factors that affect the photoluminescence (PL) of MoS2and the accompanying fabrication challenges. We first apply a superacid treatment to MoS2, which is known to increase PLQY to near unity. We demonstrate a photoinduced PL enhancement up to 74x in intensity from laser light exposure over hours. Using a high vacuum chamber, we verify that exposure to air is necessary for PL enhancement to occur. We attribute PL intensity and peak wavelength changes to a reduction in non-radiative pathways using single photon lifetime counting.We also explore metallic nanostructure decoration to MoS2as a means to further enhance PL and investigate exciton-plasmon coupling mechanisms. We couple the resulting excitonic photoluminescence in MoS2to lithographically defined plasmonic gold nanodisk arrays. We study how the placement of the 2D membrane and superacid treatment affect the coupling strength of the system. This creates light-matter hybrid particles known as exciton-plasmon polaritons, defined by observed spectral splitting at the exciton resonance. We achieve a Rabi splitting of 86meV in untreated MoS2with nanodisks on top and 113meV after TFSI treatment. We also contribute new fabrication processes to obtain clean large-area monolayer MoS2on both polymer and silicon substrates. The presented work is an important step in manipulating 2D semiconductor light emission and detection for future optoelectronic devices.

English

ISBN: 9798302371218Subjects--Topical Terms:

3561040
Crystal structure.

Manipulation and Enhancement of Excitonic Optical Spectroscopy in Two-Dimensional Semiconductors /
LDR:03717nmm a22004093i 4500 001 2429441
005 20250430100829.5
006 m o d
007 cr|nu||||||||
008 261011s2024 miu||||||m |||||||eng d
020 $a 9798302371218
035 $a (MiAaPQD)AAI31822582
035 $a AAI31822582
040 $a MiAaPQD $b eng $c MiAaPQD $e rda
100 1 $a Tyson, Kurt Henry, $e author. $3 3817289
245 1 0 $a Manipulation and Enhancement of Excitonic Optical Spectroscopy in Two-Dimensional Semiconductors / $c Kurt Henry Tyson.
264 1 $a Ann Arbor : $b ProQuest Dissertations & Theses, $c 2024
300 $a 1 electronic resource (217 pages)
336 $a text $b txt $2 rdacontent
337 $a computer $b c $2 rdamedia
338 $a online resource $b cr $2 rdacarrier
500 $a Source: Dissertations Abstracts International, Volume: 86-07, Section: B.
500 $a Advisors: Knobel, Robert.
502 $b Ph.D. $c Queen's University (Canada) $d 2024.
520 $a Two-dimensional materials present a promising foundation for developing next-generation ultrathin, flexible, and durable optoelectronic devices. Amongst the family of 2D materials, semiconducting monolayer MoS2has garnered immense attention due to its direct bandgap with emissions in the visible light spectrum. Not only does this pave the way towards atomically thin photodetectors, emitters, and switches, but the high excitonic binding energies at room temperature provide a promising platform to explore novel physical phenomena such as exciton-plasmon polaritons. Unfortunately, MoS2suffers from low photoluminescence quantum yield (PLQY), where non-radiative recombination pathways compete with the radiative recombination of excitons. This leads to an extensive reduction in light emission efficiency (0.01-0.6%). Inherent defect sites, vacancies, and charge carrier density contribute to decreased PLQY, but the underlying mechanisms are heavily debated. In this work, we investigate factors that affect the photoluminescence (PL) of MoS2and the accompanying fabrication challenges. We first apply a superacid treatment to MoS2, which is known to increase PLQY to near unity. We demonstrate a photoinduced PL enhancement up to 74x in intensity from laser light exposure over hours. Using a high vacuum chamber, we verify that exposure to air is necessary for PL enhancement to occur. We attribute PL intensity and peak wavelength changes to a reduction in non-radiative pathways using single photon lifetime counting.We also explore metallic nanostructure decoration to MoS2as a means to further enhance PL and investigate exciton-plasmon coupling mechanisms. We couple the resulting excitonic photoluminescence in MoS2to lithographically defined plasmonic gold nanodisk arrays. We study how the placement of the 2D membrane and superacid treatment affect the coupling strength of the system. This creates light-matter hybrid particles known as exciton-plasmon polaritons, defined by observed spectral splitting at the exciton resonance. We achieve a Rabi splitting of 86meV in untreated MoS2with nanodisks on top and 113meV after TFSI treatment. We also contribute new fabrication processes to obtain clean large-area monolayer MoS2on both polymer and silicon substrates. The presented work is an important step in manipulating 2D semiconductor light emission and detection for future optoelectronic devices.
546 $a English
590 $a School code: 0283
650 4 $a Crystal structure. $3 3561040
650 4 $a Metals. $3 601053
650 4 $a Lifetime. $3 3684906
650 4 $a Gold. $3 659820
650 4 $a Semiconductors. $3 516162
650 4 $a Lasers. $3 535503
650 4 $a Nanoparticles. $3 605747
650 4 $a Chemical vapor deposition. $3 621056
650 4 $a Silver. $3 2006426
650 4 $a Molecular beam epitaxy. $3 601057
650 4 $a Graphene. $3 1569149
650 4 $a Transistors. $3 713271
650 4 $a Thin films. $3 626403
650 4 $a Scanning electron microscopy. $3 551366
650 4 $a Analytical chemistry. $3 3168300
650 4 $a Condensed matter physics. $3 3173567
650 4 $a Electrical engineering. $3 649834
650 4 $a Materials science. $3 543314
650 4 $a Nanotechnology. $3 526235
650 4 $a Optics. $3 517925
690 $a 0486
690 $a 0611
690 $a 0544
690 $a 0794
690 $a 0652
690 $a 0752
710 2 $a Queen's University (Canada). $e degree granting institution. $3 3765623
720 1 $a Knobel, Robert $e degree supervisor.
773 0 $t Dissertations Abstracts International $g 86-07B.
790 $a 0283
791 $a Ph.D.
792 $a 2024
856 4 0 $u https://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=31822582