Putting order into PM6:Y6 solar cells to reduce the Langevin recombination in 400 nm thick junction

Seyed Mehrdad Hosseini^a, Safa Shoaee^a, Nurlan Tokmoldin^a, Dieter Neher^a, Han Young Woo^b, Yingping Zou^c

^aUniversity of Potsdam, Institute of Physics and Astronomy, Karl-Liebknecht-Str 24-25, Potsdam, 14476, Germany

^bKorea University, Department of Chemistry, College of Science, 145 Anam-ro, Anam-dong, Seongbuk-gu, Seoul, Corea del Sur, Seoul, Korea, Republic of

^cCentral South University, College of Chemistry and Chemical Engineering, China, Yuelu District, Changsha, China, 410083, Changsha, China

Materials for Sustainable Development Conference (MATSUS)
Proceedings of Online nanoGe Fall Meeting 20 (OnlineNFM20)

#NewOPV20. Non-fullerene Electron acceptors Within Organic Photovoltaics

Online, Spain, 2020 October 20th - 23rd

Organizers: Vida Engmann and Morten Madsen

Contributed talk, Seyed Mehrdad Hosseini, presentation 133
Publication date: 4th October 2020

One of the great challenges facing organic solar cells (OSCs) for commercialisation, is increasing the active layer thickness without sacrificing the power conversion efficiency (PCE) and the fill factor (FF). Recently, PM6:Y6 as an OSC based on non-fullerene acceptor (NFA) has excited the community because of its PCE reaching as high as 15.9%; however, by increasing the thickness, the PCE drops due to reduction of the FF. This drop is attributed to change in mobility ratio with increasing thickness. Furthermore, this work demonstrates that by regulating the packing and the crystallinity of the donor and the acceptor, through volumetric content of chloronaphthalene (CN) as a solvent additive, one can improve the FF of thick PM6:Y6 device (~400nm) from 58% to 68% (PCE enhances from 12.2% to 14.4%) [1]. Our data indicates that the origin of this enhancement is the reduction of the structural and energetic disorders in the thick device with 1.5%CN compared with 0.5%CN. This correlates with improved electron and hole mobilities (by 1.4 and 3.6 times, respectively) and a 50% suppressed bimolecular recombination, such that the non-Langevin reduction factor is 180 times. This work reveals the role of disorder on the charge extraction and bimolecular recombination of NFA based OSCs.

Reference:

[1] Hosseini, Seyed Mehrdad, et al. "Putting Order into PM6: Y6 Solar Cells to Reduce the Langevin Recombination in 400 nm Thick Junction." Solar RRL.

Acknowledgements:

This work was funded by Alexander von Humboldt Foundation (Sofja Kovalevskaja award).

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