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Javed, Iqbal
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Publications (2 of 2) Show all publications
Iqbal, J., Enevold, J., Larsen, C., Wang, J., Revoju, S., Barzegar, H. R., . . . Edman, L. (2016). An arylene-vinylene based donor-acceptor-donor small molecule for the donor compound in high-voltage organic solar cells. Solar Energy Materials and Solar Cells, 155, 348-355
Open this publication in new window or tab >>An arylene-vinylene based donor-acceptor-donor small molecule for the donor compound in high-voltage organic solar cells
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2016 (English)In: Solar Energy Materials and Solar Cells, ISSN 0927-0248, E-ISSN 1879-3398, Vol. 155, p. 348-355Article in journal (Refereed) Published
Abstract [en]

A donor-acceptor-donor (D-A-D) molecule has been designed and synthesized for use as the electron donating material in solution-processed small-molecule organic solar cells (OSCs). The D-A-D molecule comprises a central electron-accepting (2Z,2'Z)-2,2'-(2,5-bis(octyloxy)-1,4-phenylene)bis(3-(thiophen-2-yl)acry lonitrile) (ZOPTAN) core, which is chemically connected to two peripheral and electron-donating triphenylamine (TPA) units. The ZOPTAN-TPA molecule features a low HOMO level of -5.2 eV and an optical energy gap of 2.1 eV. Champion OSCs based on a solution-processed and non-annealed active material blend of [6,6]-phenyl-C-61-butyric acid methyl ester (PCBM) and ZOPTAN-TPA in a mass ratio of 2:1 exhibits a power conversion efficiency of 1.9% and a high open-circuit voltage of 1.0 V. 

Keywords
Organic solar cell, Small-molecule donor, Fullerene acceptor, Solution processing, High open-circuit ltage, Thermal stability
National Category
Atom and Molecular Physics and Optics
Identifiers
urn:nbn:se:umu:diva-126290 (URN)10.1016/j.solmat.2016.06.018 (DOI)000381529100040 ()
Available from: 2016-11-08 Created: 2016-10-03 Last updated: 2018-06-09Bibliographically approved
Javed, I., Khurshid, A., Arshad, M. N. & Wang, Y. (2014). Photophysical and electrochemical properties and temperature dependent geometrical isomerism in alkyl quinacridonediimines. New Journal of Chemistry, 38(2), 752-761
Open this publication in new window or tab >>Photophysical and electrochemical properties and temperature dependent geometrical isomerism in alkyl quinacridonediimines
2014 (English)In: New Journal of Chemistry, ISSN 1144-0546, E-ISSN 1369-9261, Vol. 38, no 2, p. 752-761Article in journal (Refereed) Published
Abstract [en]

Quinacridone diimines 1-10 were synthesized by the condensation of anilines with alkyl substituted quinacridones (QA). Photophysical and electrochemical properties of the compounds were investigated. Unconventional behavior of absorption spectra suggested a decrease in pi(-)conjugation within the QA skeleton as well as lack of extended pi(-)conjugation between the QA skeleton and the N-phenyl rings. A computational study of compounds 1-10, a variable temperature H-1 NMR study of compounds 2, 7 and 10 (for instance), and single crystal X-ray analysis of 2, 3, 6, 7, 8 and 10 indicated that the anomalous behavior is due to the buckled, non-planar structure of the quinacridones. Moreover the molecules existed in two interconvertible geometric isomeric forms at different temperatures. Molecular orbital calculations were performed at B3LYP/6-31+G(d), B3PW91/6-31G(d) and PBEPBE/6-31G(d) levels of theory at B3PW91/6-31G(d) optimized structures for both isomers of all compounds (1-10); the results obtained are in close agreement with the experimentally determined values.

Place, publisher, year, edition, pages
Royal Society of Chemistry, 2014
National Category
Chemical Sciences
Identifiers
urn:nbn:se:umu:diva-86338 (URN)10.1039/c3nj00477e (DOI)000330043700041 ()
Available from: 2014-02-24 Created: 2014-02-24 Last updated: 2018-06-08Bibliographically approved
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