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Charge Carrier Processes in Photovol...

Roland, Paul.

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Charge Carrier Processes in Photovoltaic Materials and Devices: Lead Sulfide Quantum Dots and Cadmium Telluride.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Charge Carrier Processes in Photovoltaic Materials and Devices: Lead Sulfide Quantum Dots and Cadmium Telluride./
Author:	Roland, Paul.
Published:	Ann Arbor : ProQuest Dissertations & Theses, : 2015,
Description:	124 p.
Notes:	Source: Dissertation Abstracts International, Volume: 78-02(E), Section: B.
Contained By:	Dissertation Abstracts International78-02B(E).
Subject:	Physics. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=10145210
ISBN:	9781369007534

Charge Carrier Processes in Photovoltaic Materials and Devices: Lead Sulfide Quantum Dots and Cadmium Telluride.
Roland, Paul.

Charge Carrier Processes in Photovoltaic Materials and Devices: Lead Sulfide Quantum Dots and Cadmium Telluride. - Ann Arbor : ProQuest Dissertations & Theses, 2015 - 124 p.

Source: Dissertation Abstracts International, Volume: 78-02(E), Section: B.

Thesis (Ph.D.)--The University of Toledo, 2015.

Charge separation, transport, and recombination represent fundamental processes for electrons and holes in semiconductor photovoltaic devices. Here, two distinct materials systems, based on lead sulfide quantum dots and on polycrystalline cadmium telluride, are investigated to advance the understanding of their fundamental nature for insights into the material science necessary to improve the technologies. Lead sulfide quantum dots QDs have been of growing interest in photovoltaics, having recently produced devices exceeding 10% conversion efficiency. Carrier transport via hopping through the quantum dot thin films is not only a function of inter-QD distance, but of the QD size and dielectric media of the surrounding materials. By conducting temperature dependent transmission, photoluminescence, and time resolved photoluminescence measurements, we gain insight into photoluminescence quenching and size-dependent carrier transport through QD ensembles.

ISBN: 9781369007534Subjects--Topical Terms:

516296
Physics.

Charge Carrier Processes in Photovoltaic Materials and Devices: Lead Sulfide Quantum Dots and Cadmium Telluride.
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100 1 $a Roland, Paul. $3 3281077
245 1 0 $a Charge Carrier Processes in Photovoltaic Materials and Devices: Lead Sulfide Quantum Dots and Cadmium Telluride.
260 1 $a Ann Arbor : $b ProQuest Dissertations & Theses, $c 2015
300 $a 124 p.
500 $a Source: Dissertation Abstracts International, Volume: 78-02(E), Section: B.
502 $a Thesis (Ph.D.)--The University of Toledo, 2015.
520 $a Charge separation, transport, and recombination represent fundamental processes for electrons and holes in semiconductor photovoltaic devices. Here, two distinct materials systems, based on lead sulfide quantum dots and on polycrystalline cadmium telluride, are investigated to advance the understanding of their fundamental nature for insights into the material science necessary to improve the technologies. Lead sulfide quantum dots QDs have been of growing interest in photovoltaics, having recently produced devices exceeding 10% conversion efficiency. Carrier transport via hopping through the quantum dot thin films is not only a function of inter-QD distance, but of the QD size and dielectric media of the surrounding materials. By conducting temperature dependent transmission, photoluminescence, and time resolved photoluminescence measurements, we gain insight into photoluminescence quenching and size-dependent carrier transport through QD ensembles.
520 $a Turning to commercially relevant cadmium telluride (CdTe), we explore the high concentrations of self-compensating defects (donors and acceptors) in polycrystalline thin films via photoluminescence from recombination at defect sites. Low temperature (25 K) photoluminescence measurements of CdTe reveal numerous radiative transitions due to exciton, trap assisted, and donor-acceptor pair recombination events linked with various defect states. Here we explore the difference between films deposited via close space sublimation (CSS) and radio frequency magnetron sputtering, both as-grown and following a cadmium chloride treatment. The as-grown CSS films exhibited a strong donor-acceptor pair transition associated with deep defect states. Constructing photoluminescence spectra as a function of time from time-resolved photoluminescence data, we report on the temporal evolution of this donor-acceptor transition. Having gained insight into the cadmium telluride film quality from low temperature photoluminescence measurements, we now turn to completed devices, evaluating the influence of back contact transport versus temperature.
520 $a Cadmium telluride photovoltaic devices are known to form a Schottky junction when simply using a metal back contact. Our group previously reported on the attempted application of iron pyrite nanocrystals as a back contact material due to their high conductivity and doping concentration. These devices, however, exhibited non-ideal current-voltage curves where an S-Kink restricted current collection and reduced efficiency. Here we employ temperature dependent current-voltage measurements to gain insight into the S-Kink behavior and attempt to replicate the current-voltage curves using circuit modeling. We develop a modified diode circuit model where an anti-parallel diode pair serves to limit the current flow at voltages near VOC. This model successfully reproduces the experimental data and provides a means to extract diode parameters from current-voltage plots exhibiting S-Kink behavior.
590 $a School code: 0232.
650 4 $a Physics. $3 516296
650 4 $a Solid state physics. $3 518873
690 $a 0605
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710 2 $a The University of Toledo. $b Physics. $3 3192633
773 0 $t Dissertation Abstracts International $g 78-02B(E).
790 $a 0232
791 $a Ph.D.
792 $a 2015
793 $a English
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=10145210