Light degradation mechanism of non-fullerene acceptor Organic Photovoltaics incorporating PM6:Y6 based Active Layer

Apostolos Ioakeimidis^a, Ioannis T. Papadas^a^,^b, Stelios A. Choulis^a

^aCyprus University of Technology, Molecular Electronics and Photonics Research Unit, Department of Mechanical Engineering and Materials Science and Engineering, Cyprus

^bUniversity of West Attica,School of Public Health,Department of Public and Community Health

Materials for Sustainable Development Conference (MATSUS)
Proceedings of nanoGe Spring Meeting 2022 (NSM22)

#OrgFun22. Behind the Device: Fundamental Processes in Organic Electronics

Online, Spain, 2022 March 7th - 11th

Organizers: Jose Manuel Marin Beloqui, Claudia Tait and Emrys Evans

, Apostolos Ioakeimidis, presentation 366
DOI: https://doi.org/10.29363/nanoge.nsm.2022.366
Publication date: 7th February 2022

Implementation of non-fullerene acceptors (NFA) in organic solar cells (OSC) have resulted to a rapidly increase of their PCE with the best reported efficiency being close to 19%.[1] Nevertheless, the stability of the NFA solar cell devices under light simulated conditions requires further investigation.[2] We examined the light degradation of unencapsulated inverted organic solar based on the binary PM6:Y6 and ternary PM6:Y6:IDTBR active layers under 1 sun simulated light (A.M. 1.5) in air. The ternary based OSC shows improved light stability in consistence with previous light stability report performed under white LED light in inert atmosphere.[3] We present, UV-Vis absorbance and PL measurements on the pristine, binary and ternary active layer materials under investigation showing that the conjugated polymer PM6 donor has the most severe light degradation contribution within the NFA based active layer, since after 90 min light exposure the PL signal of the pristine PM6 quenches more than 95 % compared to fresh (non-degraded) PM6. Furthermore, the PL signal of the binary PM6:Y6 active layer exhibits more severe quenching to wavelength region attributed to PM6. The addition of IDTBR in PM6:Y6 NFA based blend mitigates PL quenching, a parameter which can be correlated with the improved light degradation resistance of the corresponding ternary based inverted PM6:Y6:IDTBR solar cells.

References:

[1] Bao, S.; Yang, H.; Fan, H.; Zhang, J.; Wei, Z.; Cui, C.; Li, Y. Volatilizable Solid Additive-Assisted Treatment Enables Organic Solar Cells with Efficiency over 18.8% and Fill Factor Exceeding 80%. Adv. Mater. 2021, 33 (48), 1–10.

[2] Speller, E.M.; Clarke, A.J.; Luke, J.; Lee, H.K.H.; Durrant, J.R.; et. al. From fullerene acceptors to non-fullerene acceptors: prospects and challenges in the stability of organic solar cells. J. Mater. Chem. A Mater. Energy Sustain. 2019 7, 23361–23377.

[3] Gasparini,N.; Paleti, S. H. K.; Bertrandie, J.; et. al. Exploiting Ternary Blends for Improved Photostability in High-Efficiency Organic Solar Cells, ACS Energy Lett. 2020, 5, 5, 1371–1379

Acknowledgements:

The authors acknowledge funding from the EU Horizon 2020 research and innovation programme under grant agreement 862474 (project RoLA-FLEX).

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