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Controlling the Morphology of Polyme...

Aguirre, Jordan Christopher.

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Controlling the Morphology of Polymer and Fullerene Blends in Organic Photovoltaics Through Sequential Processing and Self-Assembly.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Controlling the Morphology of Polymer and Fullerene Blends in Organic Photovoltaics Through Sequential Processing and Self-Assembly./
Author:	Aguirre, Jordan Christopher.
Description:	212 p.
Notes:	Source: Dissertation Abstracts International, Volume: 76-10(E), Section: B.
Contained By:	Dissertation Abstracts International76-10B(E).
Subject:	Physical chemistry. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3705001
ISBN:	9781321777543

Controlling the Morphology of Polymer and Fullerene Blends in Organic Photovoltaics Through Sequential Processing and Self-Assembly.
Aguirre, Jordan Christopher.

Controlling the Morphology of Polymer and Fullerene Blends in Organic Photovoltaics Through Sequential Processing and Self-Assembly. - 212 p.

Source: Dissertation Abstracts International, Volume: 76-10(E), Section: B.

Thesis (Ph.D.)--University of California, Los Angeles, 2015.

Organic photovoltaics are a potential source for cheap renewable energy. However one of the main limitations to the field thus far has been scalability. Power conversion efficiencies of photovoltaic films made on the laboratory scale of a couple of mm2 can be as high as 10%. However when the device area is increased to even tens of mm2 power conversion efficiency plummets. This work presented in this dissertation focuses on understanding and circumventing the issues limiting the expansion of photovoltaic processing to larger device areas.

ISBN: 9781321777543Subjects--Topical Terms:

1981412
Physical chemistry.

Controlling the Morphology of Polymer and Fullerene Blends in Organic Photovoltaics Through Sequential Processing and Self-Assembly.
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100 1 $a Aguirre, Jordan Christopher. $3 3192976
245 1 0 $a Controlling the Morphology of Polymer and Fullerene Blends in Organic Photovoltaics Through Sequential Processing and Self-Assembly.
300 $a 212 p.
500 $a Source: Dissertation Abstracts International, Volume: 76-10(E), Section: B.
500 $a Adviser: Benjamin J. Schwartz.
502 $a Thesis (Ph.D.)--University of California, Los Angeles, 2015.
520 $a Organic photovoltaics are a potential source for cheap renewable energy. However one of the main limitations to the field thus far has been scalability. Power conversion efficiencies of photovoltaic films made on the laboratory scale of a couple of mm2 can be as high as 10%. However when the device area is increased to even tens of mm2 power conversion efficiency plummets. This work presented in this dissertation focuses on understanding and circumventing the issues limiting the expansion of photovoltaic processing to larger device areas.
520 $a One method of maintaining photovoltaic efficiency over a large range of device areas is to use self-assembling materials to control the active layer morphology. These materials should give the preferred morphology regardless of substrate size. I first study photovoltaic devices utilizing self-assembling fullerenes designed to form nanometer-scale wires within the film active layer. I show that fullerene that are able to form these nano-wires give a higher device range electron mobility through measuring the space charge limited current through a photovoltaic device. However the photovoltaic efficiencies of devices using these fullerenes remains low. I use time resolved microwave conductivity to measure the local nm-scale mobility of these fullerenes to show that there exists two ranges of mobilities in organic photovoltaic films. The nm-scale mobility, governed by electronic overlap of neighboring molecules, and the device range mobility, governed by film morphology. I show that device performance is maximized when both mobility scales are taken into account.
520 $a Self-assembly is not the only method to achieve scalable organic photovoltaic devices. Next, I show that the fabrication method of sequential processing can give identical device performance between films fabricated on 7.2 mm 2 and 34 mm2 substrates. This is because films produced by sequential processing allows the polymer layer to form prior to fullerene deposition, giving higher film quality. I show this scalability is not seen in films that are fabricated through blendcasting, where the donor and acceptor materials are blending together in solution and deposited together onto the substrate.
520 $a Sequential processing proves to be a powerful fabrication technique in making scalable organic photovoltaic films. Therefore I develop a method of selecting fullerene deposition solvents that are compatible with any donor polymer. I show that polymer swelling is a key step in sequential processing film formation. I provide a procedure on tuning the chi interaction parameter between the fullerene deposition solvent and the polymer layer. This is done by mixing a good polymer solvent with a poor polymer solvent. This ensures the fullerene deposition solvent swells, but does not dissolve the polymer film. By selecting the correct polymer solvent/non-solvent pair and ratio films fabricated by sequential processing can reach device performances matching those fabricated by traditional blendcasting.
590 $a School code: 0031.
650 4 $a Physical chemistry. $3 1981412
650 4 $a Energy. $3 876794
650 4 $a Alternative Energy. $3 1035473
690 $a 0494
690 $a 0791
690 $a 0363
710 2 $a University of California, Los Angeles. $b Chemistry 0153. $3 2096181
773 0 $t Dissertation Abstracts International $g 76-10B(E).
790 $a 0031
791 $a Ph.D.
792 $a 2015
793 $a English
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3705001