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N-Heteroacenes as a New Class of Non-Fullerene Electron Acceptors for Organic Bulk-Heterojunction Photovoltaic Devices

Title data

Lami, Vincent ; Leibold, David ; Fassl, Paul ; Hofstetter, Yvonne J. ; Becker-Koch, David ; Biegger, Philipp ; Paulus, Fabian ; Hopkinson, Paul E. ; Adams, Michael ; Bunz, Uwe H. F. ; Hüttner, Sven ; Howard, Ian ; Bakulin, Artem A. ; Vaynzof, Yana:
N-Heteroacenes as a New Class of Non-Fullerene Electron Acceptors for Organic Bulk-Heterojunction Photovoltaic Devices.
In: Solar RRL. Vol. 1 (2017) Issue 6 . - Art.Nr. 1700053.
ISSN 2367-198X
DOI: https://doi.org/10.1002/solr.201700053

Abstract in another language

Herein, we present the first investigation of N-heteroacenes as acceptors in bulk-heterojunction solar cells. The optical and electronic properties of tetraazapentacene (TIPS-TAP), triptycenyl-tetraazapentacene (TIPS-TAP-1T), and bistriptycenyl-tetraazapentacene (TIPS-TAP-2T) compounds are characterized by UV-vis, photothermal deflection, and ultraviolet photoemission spectroscopies. We compare the photovoltaic performance of the N-heteroacenes and find that cells with TIPS-TAP-2T significantly outperform the other derivatives, achieving a power conversion efficiency of 2.5 without extensive optimization or processing additives. We characterize the morphology and order within the active layer by atomic force microscopy and grazing incidence wide-angle scattering measurements, and find that blends with TIPS-TAP result in a gross phase separation driven by its strong crystallization. The substitution with triptycenyl units suppresses this crystallization resulting in amorphous films with a finer intermixing and a smooth surface structure. Finally, we investigate the photophysics of charge separation at the donor/acceptor interface and find that it is fundamentally different from the “conventional” polymer-fullerene systems. In blends with the tetraazapentacene derivatives, exciton dissociation is relatively slow and charge separation is strongly field dependent. We observe improved charge generation and significantly reduced recombination for TIPS-TAP-2T as compared to the other derivatives, which in combination with the improved film microstructure is responsible for the enhanced photovoltaic performance.

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 > 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: 04 Sep 2017 13:51
Last Modified: 04 Sep 2017 13:51
URI: https://eref.uni-bayreuth.de/id/eprint/39263