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Light to Electrons to Bonds: Imaging...

Leenheer, Andrew Jay.

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Light to Electrons to Bonds: Imaging Water Splitting and Collecting Photoexcited Electrons.

Record Type:	Language materials, printed : Monograph/item
Title/Author:	Light to Electrons to Bonds: Imaging Water Splitting and Collecting Photoexcited Electrons./
Author:	Leenheer, Andrew Jay.
Description:	155 p.
Notes:	Source: Dissertation Abstracts International, Volume: 75-04(E), Section: B.
Contained By:	Dissertation Abstracts International75-04B(E).
Subject:	Engineering, Materials Science. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3604951
ISBN:	9781303609725

Light to Electrons to Bonds: Imaging Water Splitting and Collecting Photoexcited Electrons.
Leenheer, Andrew Jay.

Light to Electrons to Bonds: Imaging Water Splitting and Collecting Photoexcited Electrons. - 155 p.

Source: Dissertation Abstracts International, Volume: 75-04(E), Section: B.

Thesis (Ph.D.)--California Institute of Technology, 2013.

Photoelectrochemical devices can store solar energy as chemical bonds in fuels, but more control over the materials involved is needed for economic feasibility. Both efficient capture of photon energy into electron energy and subsequent electron transfer and bond formation are necessary, and this thesis explores various steps of the process. To look at the electrochemical fuel formation step, the spatially-resolved reaction rate on a water-splitting electrode was imaged during operation at a few-micron scale using optical microscopy. One method involved localized excitation of a semiconductor photoanode and recording the growth rate of bubbles to determine the local reaction rate. A second method imaged the reactant profile with a pH-sensitive fluorophore in the electrolyte to determine the local three-dimensional pH profile at patterned electrocatalysts in a confocal microscope. These methods provide insight on surface features optimal for efficient electron transfer into fuel products.

ISBN: 9781303609725Subjects--Topical Terms:

1017759
Engineering, Materials Science.

Light to Electrons to Bonds: Imaging Water Splitting and Collecting Photoexcited Electrons.
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020 $a 9781303609725
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035 $a AAI3604951
040 $a MiAaPQ $c MiAaPQ
100 1 $a Leenheer, Andrew Jay. $3 2098702
245 1 0 $a Light to Electrons to Bonds: Imaging Water Splitting and Collecting Photoexcited Electrons.
300 $a 155 p.
500 $a Source: Dissertation Abstracts International, Volume: 75-04(E), Section: B.
500 $a Adviser: Harry A. Atwater.
502 $a Thesis (Ph.D.)--California Institute of Technology, 2013.
520 $a Photoelectrochemical devices can store solar energy as chemical bonds in fuels, but more control over the materials involved is needed for economic feasibility. Both efficient capture of photon energy into electron energy and subsequent electron transfer and bond formation are necessary, and this thesis explores various steps of the process. To look at the electrochemical fuel formation step, the spatially-resolved reaction rate on a water-splitting electrode was imaged during operation at a few-micron scale using optical microscopy. One method involved localized excitation of a semiconductor photoanode and recording the growth rate of bubbles to determine the local reaction rate. A second method imaged the reactant profile with a pH-sensitive fluorophore in the electrolyte to determine the local three-dimensional pH profile at patterned electrocatalysts in a confocal microscope. These methods provide insight on surface features optimal for efficient electron transfer into fuel products.
520 $a A second set of studies examined the initial process of photoexcited electron transport and collection. An independent method to measure the minority carrier diffusion length in semiconductor photoelectrodes was developed, in which a wedge geometry is back illuminated with a small scanned spot. The diffusion length can be determined from the exponential decrease of photocurrent with thickness, and the method was demonstrated on solid-state silicon wedge diodes, as well as tungsten oxide thin-film wedge photoanodes. Finally, the possibility of absorbing and collecting sub-bandgap illumination via plasmon-enhanced hot carrier internal photoemission was modeled to predict the energy conversion efficiency. The effect of photon polarization on emission yield was experimentally tested using gold nanoantennas buried in silicon, and the correlation was found to be small.
590 $a School code: 0037.
650 4 $a Engineering, Materials Science. $3 1017759
650 4 $a Chemistry, General. $3 1021807
650 4 $a Nanoscience. $3 587832
690 $a 0794
690 $a 0485
690 $a 0565
710 2 $a California Institute of Technology. $b Materials Science. $3 2093081
773 0 $t Dissertation Abstracts International $g 75-04B(E).
790 $a 0037
791 $a Ph.D.
792 $a 2013
793 $a English
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3604951