Variation of the Side Chain Branch Position Leads to Vastly Improved Molecular Weight and OPV Performance in 4,8-dialkoxybenzo[1,2-b : 4,5-b′]dithiophene2,1,3-benzothiadiazole Copolymers
Joint Authors
Ward, Jeremy W.
Carroll, David L.
Peterson, Eric D.
Noftle, Ronald E.
Smith, Gregory M.
McLellan, Claire A.
Owen, Jack W.
MacNeill, Christopher M.
Jurchescu, Oana D.
Coffin, Robert C.
Source
Issue
Vol. 2011, Issue 2011 (31 Dec. 2011), pp.1-10, 10 p.
Publisher
Hindawi Publishing Corporation
Publication Date
2011-07-09
Country of Publication
Egypt
No. of Pages
10
Main Subjects
Engineering Sciences and Information Technology
Chemistry
Abstract EN
Through manipulation of the solubilizing side chains, we were able to dramatically improve the molecular weight (Mw) of 4,8-dialkoxybenzo[1,2-b:4,5-b′]dithiophene (BDT)/2,1,3-benzothiadiazole (BT) copolymers.
When dodecyl side chains (P1) are employed at the 4- and 8-positions of the BDT unit, we obtain a chloroform-soluble copolymer fraction with Mw of 6.3 kg/mol.
Surprisingly, by moving to the commonly employed 2-ethylhexyl branch (P2), Mw decreases to 3.4 kg/mol.
This is despite numerous reports that this side chain increases solubility and Mw.
By moving the ethyl branch in one position relative to the polymer backbone (1-ethylhexyl, P3), Mw is dramatically increased to 68.8 kg/mol.
As a result of this Mw increase, the shape of the absorption profile is dramatically altered, with λmax = 637 nm compared with 598 nm for P1 and 579 nm for P2.
The hole mobility as determined by thin film transistor (TFT) measurements is improved from ~1×10−6 cm2/Vs for P1 and P2 to 7×10−4 cm2/Vs for P3, while solar cell power conversion efficiency in increased to 2.91% for P3 relative to 0.31% and 0.19% for P1 and P2, respectively.
American Psychological Association (APA)
Coffin, Robert C.& MacNeill, Christopher M.& Peterson, Eric D.& Ward, Jeremy W.& Owen, Jack W.& McLellan, Claire A.…[et al.]. 2011. Variation of the Side Chain Branch Position Leads to Vastly Improved Molecular Weight and OPV Performance in 4,8-dialkoxybenzo[1,2-b : 4,5-b′]dithiophene2,1,3-benzothiadiazole Copolymers. Journal of Nanotechnology،Vol. 2011, no. 2011, pp.1-10.
https://search.emarefa.net/detail/BIM-481749
Modern Language Association (MLA)
Coffin, Robert C.…[et al.]. Variation of the Side Chain Branch Position Leads to Vastly Improved Molecular Weight and OPV Performance in 4,8-dialkoxybenzo[1,2-b : 4,5-b′]dithiophene2,1,3-benzothiadiazole Copolymers. Journal of Nanotechnology No. 2011 (2011), pp.1-10.
https://search.emarefa.net/detail/BIM-481749
American Medical Association (AMA)
Coffin, Robert C.& MacNeill, Christopher M.& Peterson, Eric D.& Ward, Jeremy W.& Owen, Jack W.& McLellan, Claire A.…[et al.]. Variation of the Side Chain Branch Position Leads to Vastly Improved Molecular Weight and OPV Performance in 4,8-dialkoxybenzo[1,2-b : 4,5-b′]dithiophene2,1,3-benzothiadiazole Copolymers. Journal of Nanotechnology. 2011. Vol. 2011, no. 2011, pp.1-10.
https://search.emarefa.net/detail/BIM-481749
Data Type
Journal Articles
Language
English
Notes
Includes bibliographical references
Record ID
BIM-481749