Alexandria Digital Research Library

Insights into the Rational Design of Multi-Functional Fullerene Systems for Application in Blended Heterojunction Organic Solar Cells

Author:
Cowart, John S.
Degree Grantor:
University of California, Santa Barbara. Chemistry and Biochemistry
Degree Supervisor:
Craig J. Hawker and Michael L. Chabinyc
Place of Publication:
[Santa Barbara, Calif.]
Publisher:
University of California, Santa Barbara
Creation Date:
2014
Issued Date:
2014
Topics:
Chemistry, Organic and Engineering, Materials Science
Keywords:
Bulk Heterojunction
Organic Solar Cells
Blended Heterojunction
OPVs
Organic Photovoltaics
Fullerenes
Genres:
Dissertations, Academic and Online resources
Dissertation:
Ph.D.--University of California, Santa Barbara, 2014
Description:

Elucidating the structure-function relationships of organic semiconductors has been central to the advancement of organic photovoltaics (OPVs). In particular, enhancing the performance of p-type materials in disordered heterojunctions is broadly acknowledged as the principal factor leading to current trends of improved power conversion efficiencies (PCEs). However, two additional factors are crucially important for the next step forward in improving PCEs. First, investigating the influence, design and synthesis of new n-type materials, specifically fullerene acceptors, is of high importance. Second, because fullerene performance is often compromised by the morphological disorder of bulk heterojunctions, developing fullerenes systems that retain fidelity within disordered blends is also of broad interest. In light of these challenges, the field has witnessed a notable shift towards developing a comprehensive understanding of the design rules needed to advance the performance of fullerene acceptors in bulk heterojunctions.

This work spotlights two multi-functional fullerene systems designed for blended heterojunctions. First, the synthesis of several novel fullerene-dye adducts with enhanced photon absorption will be presented. The ability of these adducts to absorb visible light in their pure state was evaluated and systematically examined versus their capacity to complement the absorption of low band gap donors and mediate charge transport in bulk heterojunctions. Second, mixed fullerene ternary blends were introduced as a strategy to stabilize the morphology in bulk heterojunctions and prolong operational lifetimes of OPV devices. Combined, these two systems offer unique insight into the rational design of fullerenes for their application in blended systems.

Physical Description:
1 online resource (211 pages)
Format:
Text
Collection(s):
UCSB electronic theses and dissertations
ARK:
ark:/48907/f3n58jhs
ISBN:
9781321567618
Catalog System Number:
990045118110203776
Rights:
Inc.icon only.dark In Copyright
Copyright Holder:
John Cowart
File Description
Access: Public access
Cowart_ucsb_0035D_12482.pdf pdf (Portable Document Format)