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Understanding the synthesis, perform...
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Flynn, Cory James.
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Understanding the synthesis, performance, and passivation of metal oxide photocathodes.
紀錄類型:
書目-電子資源 : Monograph/item
正題名/作者:
Understanding the synthesis, performance, and passivation of metal oxide photocathodes./
作者:
Flynn, Cory James.
面頁冊數:
154 p.
附註:
Source: Dissertation Abstracts International, Volume: 77-11(E), Section: B.
Contained By:
Dissertation Abstracts International77-11B(E).
標題:
Physical chemistry. -
電子資源:
http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=10119909
ISBN:
9781339811000
Understanding the synthesis, performance, and passivation of metal oxide photocathodes.
Flynn, Cory James.
Understanding the synthesis, performance, and passivation of metal oxide photocathodes.
- 154 p.
Source: Dissertation Abstracts International, Volume: 77-11(E), Section: B.
Thesis (Ph.D.)--The University of North Carolina at Chapel Hill, 2016.
Metal oxides are ubiquitous in semiconductor technologies for their ease of synthesis, chemical stability, and tunable optical/electronic properties. These properties are especially important to fabricating efficient photoelectrodes for solar-energy applications. To counter inherent problems in these materials, new strategies were developed and successfully implemented on the widely-utilized p-type semiconductor, NiO.
ISBN: 9781339811000Subjects--Topical Terms:
1981412
Physical chemistry.
Understanding the synthesis, performance, and passivation of metal oxide photocathodes.
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Metal oxides are ubiquitous in semiconductor technologies for their ease of synthesis, chemical stability, and tunable optical/electronic properties. These properties are especially important to fabricating efficient photoelectrodes for solar-energy applications. To counter inherent problems in these materials, new strategies were developed and successfully implemented on the widely-utilized p-type semiconductor, NiO.
520
$a
As the size of semiconductor materials shrink, the surface-to-volume ratio increases and surface defects dominate the performance of the materials. Surface defects can alter the optical and electronic characteristics of materials by changing the Fermi level, charge-carrier mobility, and surface reactivity. We first present a strategy to increase the electrical mobility of mesoporous metal oxide electrode materials by optimizing shape morphology. Transitioning from nanospheres to hexagonal nanoplatelets increased the charge-carrier mobility by one order of magnitude.
520
$a
We then employed this improved material with a new vapor-phase deposition method termed targeted atomic deposition (TAD) to selectively passivate defect sites in semiconductor nanomaterials. We demonstrated the capabilities of this passivation method by applying a TAD of aluminum onto NiO. By exploiting a temperature-dependent deposition process, we selectively passivated the highly reactive sites in NiO: oxygen dangling bonds associated with Ni vacancies. The TAD treatment completely passivated all measurable surface defects, optically bleached the material, and significantly improved all photovoltaic performance metrics in dye-sensitized solar cells. The technique was proven to be generic to numerous forms of NiO.
520
$a
While the implementation of TAD of Al was successful, the process involved pulsing two precursors to passivate the material. Ideally, the TAD process should require only a single precursor and continuous exposure. We utilized a continuous flow of diborane to perform a TAD of B onto NiO. The TAD process was successfully implemented in a simplified manner. The treatment moderately increased DSSC performance and proved viability with a different vapor-phase precursor.
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