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A Surface Chemistry Approach to Enha...

Carey, Graham Hamilton.

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A Surface Chemistry Approach to Enhancing Colloidal Quantum Dot Solids for Photovoltaics.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	A Surface Chemistry Approach to Enhancing Colloidal Quantum Dot Solids for Photovoltaics./
作者:	Carey, Graham Hamilton.
面頁冊數:	126 p.
附註:	Source: Dissertation Abstracts International, Volume: 77-06(E), Section: B.
Contained By:	Dissertation Abstracts International77-06B(E).
標題:	Nanotechnology. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3746229
ISBN:	9781339394916

A Surface Chemistry Approach to Enhancing Colloidal Quantum Dot Solids for Photovoltaics.
Carey, Graham Hamilton.

A Surface Chemistry Approach to Enhancing Colloidal Quantum Dot Solids for Photovoltaics. - 126 p.

Source: Dissertation Abstracts International, Volume: 77-06(E), Section: B.

Thesis (Ph.D.)--University of Toronto (Canada), 2015.

Colloidal quantum dot (CQD) photovoltaic devices have improved rapidly over the past decade of research. By taking advantage of the quantum confinement effect, solar cells constructed using films of infrared-bandgap nanoparticles are able to capture previously untapped ranges of the solar energy spectrum. Additionally, films are fabricated using simple, cheap, reproducible solution processing techniques, enabling the creation of low-cost, flexible photovoltaic devices.

ISBN: 9781339394916Subjects--Topical Terms:

526235
Nanotechnology.

A Surface Chemistry Approach to Enhancing Colloidal Quantum Dot Solids for Photovoltaics.
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245 1 2 $a A Surface Chemistry Approach to Enhancing Colloidal Quantum Dot Solids for Photovoltaics.
300 $a 126 p.
500 $a Source: Dissertation Abstracts International, Volume: 77-06(E), Section: B.
500 $a Adviser: Edward H. Sargent.
502 $a Thesis (Ph.D.)--University of Toronto (Canada), 2015.
520 $a Colloidal quantum dot (CQD) photovoltaic devices have improved rapidly over the past decade of research. By taking advantage of the quantum confinement effect, solar cells constructed using films of infrared-bandgap nanoparticles are able to capture previously untapped ranges of the solar energy spectrum. Additionally, films are fabricated using simple, cheap, reproducible solution processing techniques, enabling the creation of low-cost, flexible photovoltaic devices.
520 $a A key factor limiting the creation of high efficiency CQD solar cells is the short charge carrier diffusion length in films. Driven by a combination of limited carrier mobility, poor nanoparticle surface passivation, and the presence of unexamined electrically active impurities throughout the film, the poor diffusion length limits the active layer thickness in CQD solar cells, leading to lower-than-desired light absorption, and curtailing the photocurrent generated by such devices.
520 $a This thesis seeks to address poor diffusion length by addressing each of the limiting factors in turn. Electrical transport in quantum dot solids is examined in the context of improved quantum dot packing; methods are developed to improve packing by using actively densifying components, or by dramatically lowering the volume change required between quantum dots in solution and in solid state. Quantum dot surface passivation is improved by introducing a crucial secondary, small halide ligand source, and by surveying the impact of the processing environment on the final quality of the quantum dot surface. A heretofore unidentified impurity present in quantum dot solids is identified, characterized, and chemically eliminated. Finally, lessons learned through these experiments are combined into a single, novel materials system, leading to quantum dot devices with a significantly improved diffusion length (enhanced from 70 to 230 nm). This enabled thick, high current density (30 mA cm -2, compared to typical values in the 20--25 mA cm-2 range) devices, and the highest reported solar power conversion efficiency to date.
590 $a School code: 0779.
650 4 $a Nanotechnology. $3 526235
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710 2 $a University of Toronto (Canada). $b Electrical and Computer Engineering. $3 2096349
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793 $a English
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