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Using Inorganic Nanoparticle Surface Passivation as a Tool for New Approaches in Photovoltaics

Bloom, Brian P. (2016) Using Inorganic Nanoparticle Surface Passivation as a Tool for New Approaches in Photovoltaics. Doctoral Dissertation, University of Pittsburgh. (Unpublished)

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Colloidal semiconductor nanoparticles (NPs) are an attractive alternative for optoelectronic devices owing to their low cost, solution processability, and interesting quantum confinement properties. Much progress has been made towards the development of semiconductor NP based devices, however, only recently have researchers begun to understand and utilize the role of the NP surface capping ligands in these systems. The fundamental studies in this dissertation focus on the ligand-NP interaction and the interesting properties that become manifest. The first series of experiments discussed herein explore the influence of the ligand on the size dependent electronic state energies of CdSe NPs. The second study shows how Fermi-level pinning of PbS NPs on a gold substrate inhibits the size and ligand dependent changes in the electronic states. It was found that the insertion of an alumina layer decouples the NPs from the substrate and the size and ligand dependent energy shifts are restored. The third study in this dissertation shows how capping CdSe NPs with chiral ligands can lead to spin specific conduction pathways. The last study investigates charge transport in donor bridge acceptor NP dyads on a microbead template. By changing the size of the acceptor and its ligand length, charge transport could be studied as a function of driving force and bridge length. The findings in these studies elucidate the importance of capping ligand on the physical properties of semiconductor NPs and may guide the development for future advances in optoelectronic devices.


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Item Type: University of Pittsburgh ETD
Status: Unpublished
CreatorsEmailPitt UsernameORCID
Bloom, Brian P.bpb8@pitt.eduBPB8
ETD Committee:
TitleMemberEmail AddressPitt UsernameORCID
Committee ChairWaldeck, David H.Dave@pitt.eduDAVE
Committee MemberLiu, Haitaohliu@pitt.eduHLIU
Committee MemberMillstone, Jilljem210@pitt.eduJEM210
Committee MemberLee, Jung-Kunjul37@pitt.eduJUL37
Date: 22 September 2016
Date Type: Publication
Defense Date: 29 July 2016
Approval Date: 22 September 2016
Submission Date: 13 July 2016
Access Restriction: 5 year -- Restrict access to University of Pittsburgh for a period of 5 years.
Number of Pages: 212
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: Nanoparticle, Quantum Dot, Ligand Exchange, Chiral induced Spin Selectivity, Fermi-level pinning
Date Deposited: 23 Sep 2016 01:04
Last Modified: 22 Sep 2021 05:15

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