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Traps and transport resistance are the next frontiers for stable non-fullerene acceptor solar cells

Title data

Wöpke, Christopher ; Göhler, Clemens ; Saladina, Maria ; Du, Xiaoyan ; Nian, Li ; Greve, Christopher ; Zhu, Chenhui ; Yallum, Kaila M. ; Hofstetter, Yvonne J. ; Becker-Koch, David ; Li, Ning ; Heumüller, Thomas ; Milekhin, Ilya ; Zahn, Dietrich R. T. ; Brabec, Christoph J. ; Banerji, Natalie ; Vaynzof, Yana ; Herzig, Eva M. ; MacKenzie, Roderick C. I. ; Deibel, Carsten:
Traps and transport resistance are the next frontiers for stable non-fullerene acceptor solar cells.
In: Nature Communications. Vol. 13 (1 July 2022) Issue 1 . - No. 3786.
ISSN 2041-1723
DOI: https://doi.org/10.1038/s41467-022-31326-z

Abstract in another language

Stability is one of the most important challenges facing material research for organic solar cells (OSC) on their path to further commercialization. In the high-performance material system PM6:Y6 studied here, we investigate degradation mechanisms of inverted photovoltaic devices. We have identified two distinct degradation pathways: one requires the presence of both illumination and oxygen and features a short-circuit current reduction, the other one is induced thermally and marked by severe losses of open-circuit voltage and fill factor. We focus our investigation on the thermally accelerated degradation. Our findings show that bulk material properties and interfaces remain remarkably stable, however, aging-induced defect state formation in the active layer remains the primary cause of thermal degradation. The increased trap density leads to higher non-radiative recombination, which limits the open-circuit voltage and lowers the charge carrier mobility in the photoactive layer. Furthermore, we find the trap-induced transport resistance to be the major reason for the drop in fill factor. Our results suggest that device lifetimes could be significantly increased by marginally suppressing trap formation, leading to a bright future for OSC.

Further data

Item Type: Article in a journal
Refereed: Yes
Institutions of the University: Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics
Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics > Juniorprofessor Experimental Physics VII - Dynamics and Structure Formation
Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics > Juniorprofessor Experimental Physics VII - Dynamics and Structure Formation > Juniorprofessor Experimental Physics VII - Dynamics and Structure Formation - Juniorprof. Dr. Eva M. Herzig
Result of work at the UBT: Yes
DDC Subjects: 500 Science > 530 Physics
Date Deposited: 25 Jul 2022 07:03
Last Modified: 25 Jul 2022 07:03
URI: https://eref.uni-bayreuth.de/id/eprint/70699