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Charge Transfer and Photovoltaics with Inorganic Semiconductor Nanoparticles

Wang, Yang (2014) Charge Transfer and Photovoltaics with Inorganic Semiconductor Nanoparticles. Doctoral Dissertation, University of Pittsburgh. (Unpublished)

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Colloidal semiconductor nanoparticles (NP) are emerging as a new class of solution-processable materials for low-cost, flexible, thin-film photovoltaic devices. The NP quantum size effect allows researchers to selectively tune the NP 19s absorption coverage across a broad range of the solar spectrum. Recent advances have led to a power conversion efficiency of 7% for NP-based solar cells. However, exciton generation, separation, and recombination processes in these devices are not well-understood, which largely limit further improvement of the efficiency. Thus, this dissertation studies the underlying processes that control the kinetics for photogenerated charges in the NP-based devices. The first work in this dissertation addresses how the size-tunable energetics of the NPs change once they are electronically coupled with a conductive substrate. The second study focuses on the energy architecture and alignment for the NP with respect to the energy levels of electron and hole transporting media. The third study explores the donor-acceptor interfacial charge transfer between a conjugated copolymer and a NP with the goal of driving efficient charge separation for inorganic/organic hybrid solar cells. The last study investigates the effect of thermal annealing on the photovoltaic performance for PbS NP/TiO2 depleted heterojunction solar cells. The findings in these studies provide a deeper understanding of charge transfer kinetics for the NP, and may facilitate the development of the NP-based photovoltaics for use in next generation solar cells.


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Item Type: University of Pittsburgh ETD
Status: Unpublished
CreatorsEmailPitt UsernameORCID
Wang, Yangyaw17@pitt.eduYAW17
ETD Committee:
TitleMemberEmail AddressPitt UsernameORCID
Committee ChairWaldeck, Daviddave@pitt.eduDAVE
Committee MemberHutchison, Geoffreygeoffh@pitt.eduGEOFFH
Committee MemberLee, Jung-kunjul37@pitt.eduJUL37
Committee MemberStar, Alexanderastar@pitt.eduASTAR
Date: 25 September 2014
Date Type: Publication
Defense Date: 22 October 2013
Approval Date: 25 September 2014
Submission Date: 21 May 2014
Access Restriction: No restriction; Release the ETD for access worldwide immediately.
Number of Pages: 168
Institution: University of Pittsburgh
Schools and Programs: Dietrich School of Arts and Sciences > Chemistry
Degree: PhD - Doctor of Philosophy
Thesis Type: Doctoral Dissertation
Refereed: Yes
Uncontrolled Keywords: semiconductor nanoparticles; photovoltaics; charge transfer
Date Deposited: 25 Sep 2014 18:08
Last Modified: 15 Nov 2016 14:16


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