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Designs for Donor-Acceptor Copolymer Based Double Heterojunction Solar Cells

Resource type
Date created
2017-07-10
Authors/Contributors
Abstract
Self-consistent field calculations were used to examine a design motif for organic double heterojunction solar cell materials. They are a specific type of cascade heterojunction designed to increase cell voltage without sacrificing current and consist of fully conjugated block polymers. The design employs three sections; a p-type section, an n-type section and a third section called the bridge. The energy alignment between sections is important to optimal device function and a motif based on electron donating and electron accepting subunits was evaluated. If the energetic offset between p-type and n-type sections is greater than the exciton binding energy and if the bridge is formed using the scheme presented, a nearly ideal energetic alignment is obtained. In addition, calculations on the excited states of the system were performed to illustrate the relationship between bridge length and the magnitude of charge carrier recombination currents. An order of magnitude decrease relative to the corresponding diblock polymer can be expected for bridge lengths of > 6 repeat units. Taken in sum, these results offer concrete guidelines for the development of synthetic targets in this promising class of materials.
Document
Identifier
DOI: 10.1021/acsenergylett.7b00519
Published as
Kaake, L.G. Designs for Donor-Acceptor Copolymer Based Double Heterojunction Solar Cells. ACS Energy Lett. 2017. DOI: 10.1021/acsenergylett.7b00519
Publication title
ACS Energy Lett
Document title
Designs for Donor-Acceptor Copolymer Based Double Heterojunction Solar Cells
Date
2017
Publisher DOI
10.1021/acsenergylett.7b00519
Copyright statement
Copyright is held by the author(s).
Scholarly level
Peer reviewed?
Yes
Language
English
Member of collection
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