Bloom, Brian P.
(2016)
Using Inorganic Nanoparticle Surface Passivation as a Tool for New Approaches in Photovoltaics.
Doctoral Dissertation, University of Pittsburgh.
(Unpublished)
This is the latest version of this item.
Abstract
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.
Share
| Citation/Export: |
|
| Social Networking: |
|
Details
| Item Type: |
University of Pittsburgh ETD
|
| Status: |
Unpublished |
| Creators/Authors: |
|
| ETD Committee: |
|
| 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 |
| URI: |
http://d-scholarship.pitt.edu/id/eprint/28978 |
Available Versions of this Item
-
Using Inorganic Nanoparticle Surface Passivation as a Tool for New Approaches in Photovoltaics. (deposited 23 Sep 2016 01:04)
[Currently Displayed]
Metrics
Monthly Views for the past 3 years
Plum Analytics
Actions (login required)
 |
View Item |
![[feed]](/images/feed-icon-32x32.png){kind=icon}