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Nanocrystal quantum dots as building...

Choi, Joshua Jongwoo.

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Nanocrystal quantum dots as building blocks for artificial solids and their applications in optoelectronic devices.

紀錄類型:	書目-語言資料,印刷品 : Monograph/item
正題名/作者:	Nanocrystal quantum dots as building blocks for artificial solids and their applications in optoelectronic devices./
作者:	Choi, Joshua Jongwoo.
面頁冊數:	252 p.
附註:	Source: Dissertation Abstracts International, Volume: 74-03(E), Section: B.
Contained By:	Dissertation Abstracts International74-03B(E).
標題:	Engineering, Materials Science. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3531017
ISBN:	9781267716972

Nanocrystal quantum dots as building blocks for artificial solids and their applications in optoelectronic devices.
Choi, Joshua Jongwoo.

Nanocrystal quantum dots as building blocks for artificial solids and their applications in optoelectronic devices. - 252 p.

Source: Dissertation Abstracts International, Volume: 74-03(E), Section: B.

Thesis (Ph.D.)--Cornell University, 2012.

Nanocrystal quantum dots exhibit size-dependent optoelectronic properties and provide intriguing scientific and technological opportunities. Most proposed technologies based nanocrystals depend on macroscopic functional assemblies of nanocrystals in which the nanocrystals interact with each other to give rise to new collective properties - also called as artificial solids. As in the analogous atomic crystals, the optoelectronic properties of artificial solids are governed by (1) the energy levels of nanocrystals, (2) electronic coupling between nanocrystals, and (3) the symmetry of the nanocrystal superlattice. These issues add many levels of complexity to the design of artificial solids and, for the successful development of nanocrystal based technologies, it is crucial to gain deep understanding on the structure-property relationship of nanocrystals on multiple length scales.

ISBN: 9781267716972Subjects--Topical Terms:

1017759
Engineering, Materials Science.

Nanocrystal quantum dots as building blocks for artificial solids and their applications in optoelectronic devices.
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245 1 0 $a Nanocrystal quantum dots as building blocks for artificial solids and their applications in optoelectronic devices.
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500 $a Source: Dissertation Abstracts International, Volume: 74-03(E), Section: B.
500 $a Adviser: Frank William Wise.
502 $a Thesis (Ph.D.)--Cornell University, 2012.
520 $a Nanocrystal quantum dots exhibit size-dependent optoelectronic properties and provide intriguing scientific and technological opportunities. Most proposed technologies based nanocrystals depend on macroscopic functional assemblies of nanocrystals in which the nanocrystals interact with each other to give rise to new collective properties - also called as artificial solids. As in the analogous atomic crystals, the optoelectronic properties of artificial solids are governed by (1) the energy levels of nanocrystals, (2) electronic coupling between nanocrystals, and (3) the symmetry of the nanocrystal superlattice. These issues add many levels of complexity to the design of artificial solids and, for the successful development of nanocrystal based technologies, it is crucial to gain deep understanding on the structure-property relationship of nanocrystals on multiple length scales.
520 $a In this dissertation, I will present studies that show insights into the three governing factors of the optoelectronic properties of artificial solids mentioned above. (1) Nanocrystal energy levels: a direct correlation between interfacial energy level offsets between lead chalcogenide nanocrystals and ZnO layers with photovoltaic device performance is presented. Based on obtained insights on the size dependent photovoltaic properties of lead chalcogenide nanocrystals, first demonstration of solution processed nanocrystal tandem solar cells was achieved. (2) Inter-nanocrystal electronic coupling: rates of photogenerated exciton dissociation in nanocrystal assemblies as a function of inter-nanocrystal spacing are probed. The results show that excitons dissociate via tunneling induced delocalization among neighboring nanocrystals. Based on insights obtained from this work, drastically improved performance of solution processed nanocrystal infrared light emitting diodes is demonstrated. (3) Nanocrystal superlattice symmetry: interaction between ligand molecules on the surface of nanocrystals play critical roles in self-assembly process. Differences in the coverage of surface ligands bound to nanocrystals can be exploited to tune the shape of nanocrystal interaction potential during the self-assembly. Denser ligand coverage causes nanocrystals to interact as spheres and face-centered cubic structure is formed. In contrast, sparse ligand coverage amplifies the aspherical shape of the core crystallite and can cause non-close packed structures such as body-centered cubic.
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