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Nanostructure Design and Interface Engineering for Solar Energy Conversion.

Record Type:	Language materials, manuscript : Monograph/item
Title/Author:	Nanostructure Design and Interface Engineering for Solar Energy Conversion./
Author:	Yu, Yanhao.
Description:	1 online resource (154 pages)
Notes:	Source: Dissertation Abstracts International, Volume: 78-12(E), Section: B.
Contained By:	Dissertation Abstracts International78-12B(E).
Subject:	Materials science. -
Online resource:	click for full text (PQDT)
ISBN:	9780355228489

Nanostructure Design and Interface Engineering for Solar Energy Conversion.
Yu, Yanhao.

Nanostructure Design and Interface Engineering for Solar Energy Conversion. - 1 online resource (154 pages)

Source: Dissertation Abstracts International, Volume: 78-12(E), Section: B.

Thesis (Ph.D.)

Includes bibliographical references

Increasing energy and environmental demand have promoted the exploration of research in green and renewable energy besides fossil fuel, including solar, nuclear, biomass, hydro, wind, mechanical, and thermal energy. The renewable source is expected to account for 50% of installed power generation by 2030. Among the various renewable energy sources, solar irradiation is the most popular target since it widely shines around the entire earth. To accomplish practical sunlight conversion, photoelectrodes desirably need the following features: efficient light absorption, rapid charge separation and transport, and superior stability in the harsh environment. These properties are predominantly determined, and thus can be effectively tuned, by the geometry configuration, the surface chemistry, and the electronic band structure of electrode materials. Aiming at developing efficient solar conversion systems, this dissertation primarily focuses on designing sophisticated electrode frameworks, tuning their interfacial electronic band structures, and engineering their surface chemistry.

Electronic reproduction.
Ann Arbor, Mich. :
ProQuest,
2018

Mode of access: World Wide Web

ISBN: 9780355228489Subjects--Topical Terms:

557839
Materials science.
Index Terms--Genre/Form:

554714
Electronic books.

Nanostructure Design and Interface Engineering for Solar Energy Conversion.
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100 1 $a Yu, Yanhao. $3 1181914
245 1 0 $a Nanostructure Design and Interface Engineering for Solar Energy Conversion.
264 0 $c 2017
300 $a 1 online resource (154 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: Dissertation Abstracts International, Volume: 78-12(E), Section: B.
500 $a Adviser: Xudong Wang.
502 $a Thesis (Ph.D.) $c The University of Wisconsin - Madison $d 2017.
504 $a Includes bibliographical references
520 $a Increasing energy and environmental demand have promoted the exploration of research in green and renewable energy besides fossil fuel, including solar, nuclear, biomass, hydro, wind, mechanical, and thermal energy. The renewable source is expected to account for 50% of installed power generation by 2030. Among the various renewable energy sources, solar irradiation is the most popular target since it widely shines around the entire earth. To accomplish practical sunlight conversion, photoelectrodes desirably need the following features: efficient light absorption, rapid charge separation and transport, and superior stability in the harsh environment. These properties are predominantly determined, and thus can be effectively tuned, by the geometry configuration, the surface chemistry, and the electronic band structure of electrode materials. Aiming at developing efficient solar conversion systems, this dissertation primarily focuses on designing sophisticated electrode frameworks, tuning their interfacial electronic band structures, and engineering their surface chemistry.
520 $a Chapter 1 is a general review covering the atomic layer deposition (ALD)-based three dimensional (3D) nanostructure design and surface protecting strategy for photoelectrochemical (PEC) water splitting. This background lays the foundation for understanding the evolution mechanism of 3D TiO2 discussed in chapter 2 and chapter 3, reveals the motivation of the polymer doping study discussed in chapter 4, highlights the significance of the interfacial electronic band and chemistry control discussed in chapter 5 and chapter 6.
520 $a The main discussion starts with a tree-like 3D TiO2 nanowire (NW) architecture manufactured through coupling a vapor phase Kirkendall effect and a high temperature ALD process. Compared with conventional one dimensional NW geometry, the 3D architecture can accomplish enhanced light absorption and promoted interfacial electrochemical reactions without comprising the superior charge transfer property of NWs, giving rise to 7 times improvement of PEC photocurrent density. When integrating with lead iodide perovskite solar cell, this 3D TiO2 achieved almost 2 times higher power conversion efficiency over ZnO and TiO2 NWs due to the effective loading of photoactive perovskite. Concurrently, the unique vapor solid Kirkendall effect discovered during the 3D TiO2 fabrication is able to transform a variety of ZnO nanostructures into hollow TiO2 with conserved morphology code, providing a new methodology for hierarchical material assembly.
520 $a Afterwards, on the basis of sequential infiltration synthesis (SIS), a facile polymer doping approach that can efficiently modify the bulk electronic properties of polymers is introduced. Taking triboelectric nanogenerator (TENG) as an example, we doped the triboelectric polymers with metal oxides such as AlOx and ZnOx. Consequently, the bulk and surface electrical property of triboelectric polymers were successfully altered towards the desired direction and therefore simultaneously enhance the output and stability of electronic devices.
520 $a Later on, we demonstrate a tuning of electronic band structure fulfilled through permanent ferroelectric polarization. By converting TiO2 NW surface to a ferroelectric barium titanate (BTO) thin film, the amplitude and width of the depletion region of TiO2 NW were effectively manipulated as a response to the BTO ferroelectric charge. Accordingly, the charge separation efficiency and photocurrent density were altered towards the favorable direction. Under optimized condition, 67% enhancement of photocurrent density was accomplished. The last part of the dissertation presents a low temperature TiO2 protecting strategy for silicon PEC photoanodes. Such a thin TiO2 protection can simultaneously improve the photocurrent density and operational stability of a black silicon PEC electrode. The exceptional PEC performance was found to be a result of the promoted charge separation efficiency, which was attributed to the effective TiO2 passivation of the defective sites on black silicon surface. Meanwhile, this ALD-grown TiO2 film is able to decouple the chemically unstable black silicon from the corrosive electrochemical reactions, resulting in a significant improvement of operational stability under both in-air and in-electrolyte conditions.
533 $a Electronic reproduction. $b Ann Arbor, Mich. : $c ProQuest, $d 2018
538 $a Mode of access: World Wide Web
650 4 $a Materials science. $3 557839
650 4 $a Chemistry. $3 593913
650 4 $a Energy. $3 784773
655 7 $a Electronic books. $2 local $3 554714
690 $a 0794
690 $a 0485
690 $a 0791
710 2 $a ProQuest Information and Learning Co. $3 1178819
710 2 $a The University of Wisconsin - Madison. $b Materials Engineering. $3 1181915
773 0 $t Dissertation Abstracts International $g 78-12B(E).
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=10623605 $z click for full text (PQDT)