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Morphology-Dependent Charge Photogeneration in Donor–Acceptor Block Copolymer Films Based on Poly(3-hexylthiophene)-block-Poly(perylene bisimide acrylate)

Title data

Hüttner, Sven ; Hodgkiss, Justin ; Sommer, Michael ; Friend, Richard H. ; Steiner, Ullrich ; Thelakkat, Mukundan:
Morphology-Dependent Charge Photogeneration in Donor–Acceptor Block Copolymer Films Based on Poly(3-hexylthiophene)-block-Poly(perylene bisimide acrylate).
In: The Journal of Physical Chemistry B. Vol. 116 (2012) Issue 33 . - pp. 10070-10078.
ISSN 1520-5207
DOI: https://doi.org/10.1021/jp301966p

Official URL: Volltext

Abstract in another language

We have examined how the nanomorphology and crystallinity of semiconducting double-crystalline block copolymers determine their photophysical and photovoltaic responses. The block copolymers consist of a poly(3-hexylthiophene) (P3HT) donor block coupled to a polymerized perylene bisimide acrylate (PPerAcr) acceptor. Different molecular weights and processing solvents allow the modification of the donor–acceptor interface with regard to their morphology and crystallinity. Transient absorption spectroscopy was used to resolve photoinduced charge transfer seen on the ∼1 ps time scale, consistent with substantial photoluminescence quenching caused by finely dispersed, disordered donor–acceptor interfaces. For high molecular weight block copolymers, microphase separation is enhanced by slow film formation, leading to slower charge photogeneration. The crystallinity of the P3HT component is of particular importance, which has been monitored spectroscopically. Crystalline P3HT/PPerAcr interfaces lead to high levels of long-lived charge pairs that are more easily extracted in an applied electric field. While external quantum efficiencies of over 25% were obtained, the overall power conversion efficiency of the best block copolymer device is still limited. This is due to the unsuitable orientation of the block copolymer nanomorphology, and the performance lies below that achieved for a blend of equivalent homopolymers. This suggests that increasing the molecular weight of the block copolymers to tune the microphase separation could further improve the photovoltaic efficiency. Our photophysical results give guidelines for future development of promising block copolymer-derived devices, highlighting the importance of interfacial crystallinity and sufficient phase separation.

Further data

Item Type: Article in a journal
Refereed: Yes
Institutions of the University: Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry > Professur Makromolekulare Chemie I
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry > Junior Professorship Solar Energy > Junior Professorship Solar Energy - Juniorprof. Dr. Sven Hüttner
Profile Fields > Advanced Fields > Polymer and Colloid Science
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 > Junior Professorship Solar Energy
Profile Fields
Profile Fields > Advanced Fields
Result of work at the UBT: Yes
DDC Subjects: 500 Science > 530 Physics
500 Science > 540 Chemistry
Date Deposited: 12 Jan 2018 10:36
Last Modified: 12 Jan 2018 10:36
URI: https://eref.uni-bayreuth.de/id/eprint/41716