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Microphase-Separated Donor-Acceptor Diblock Copolymers : Influence of HOMO Energy Levels and Morphology on Polymer Solar Cells

Title data

Sommer, Michael ; Lindner, Stefan M. ; Thelakkat, Mukundan:
Microphase-Separated Donor-Acceptor Diblock Copolymers : Influence of HOMO Energy Levels and Morphology on Polymer Solar Cells.
In: Advanced Functional Materials. Vol. 17 (2007) Issue 9 . - pp. 1493-1500.
ISSN 1616-301X
DOI: https://doi.org/10.1002/adfm.200600634

Project information

Project financing: Deutsche Forschungsgemeinschaft

Abstract in another language

The synthesis of novel semiconducting donor-acceptor (D-A) diblock copolymers by means of nitroxide-mediated polymerization (NMP) is reported. The copolymers contain functional moieties for hole transport, electron transport, and light absorption. The first block, representing the donor, is made up of either substituted triphenylamines (poly(bis(4-methoxyphenyl)-4-vinylphenylamine), PvDMTPA) or substituted tetraphenylbenzidines (poly(N,N-bis(4-methoxyphenyl)-N-phenyl-N-4-vinylphenyl-(1,1-biphenyl)-4,4-diamine), PvDMTPD). The second block consists of perylene diimide side groups attached to a polyacrylate backbone (PPerAcr) via a flexible spacer. This block is responsible for absorption in the visible range and for electron-transport properties. The electrochemical properties of these fully functionalized diblock copolymers, PvDMTPA-b-PPerAcr and PvDMTPD-b-PPerAcr, are investigated by cyclic voltammetry (CV), and their morphology is investigated by transmission electron microscopy (TEM). All diblock copolymers exhibit microphase-separated domains in the form of either wire- or wormlike structures made of perylene diimide embedded in a hole-conductor matrix. In single-active-layer organic solar cells, PvDMTPD-b-PPerAcr reveals a fourfold improvement in power conversion efficiency ( = 0.26 %, short-circuit current (ISC) 1.21 mA cm-2), and PvDMTPA-b-PPerAcr a fivefold increased efficiency ( = 0.32 %, ISC = 1.14 mA cm-2) compared with its unsubstituted analogue PvTPA-b-PPerAcr ( = 0.065 %, ISC = 0.23 mA cm-2).

Further data

Item Type: Article in a journal
Refereed: Yes
Institutions of the University: Faculties
Faculties > Faculty of Biology, Chemistry and Earth Sciences
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry > Chair Macromolecular Chemistry I
Profile Fields
Profile Fields > Advanced Fields
Profile Fields > Advanced Fields > Polymer and Colloid Science
Profile Fields > Emerging Fields
Profile Fields > Emerging Fields > Energy Research and Energy Technology
Research Institutions
Research Institutions > Collaborative Research Centers, Research Unit
Research Institutions > Collaborative Research Centers, Research Unit > SFB 481 Komplexe Makromolekül- und Hybridsysteme in inneren und äußeren Feldern
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry > Professorship Applied Functional Polymers > Professorship Applied Functional Polymers - Univ.-Prof. Dr. Mukundan Thelakkat
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry > Professorship Applied Functional Polymers
Result of work at the UBT: Yes
DDC Subjects: 500 Science > 540 Chemistry
Date Deposited: 15 Apr 2016 07:37
Last Modified: 21 Jul 2016 09:20
URI: https://eref.uni-bayreuth.de/id/eprint/1336