Manipulating the crystalline morphology in the non-fullerene acceptor mixture to accelerate the carrier transport and suppress the energetic disorder

Ming Zhang; Lei Zhu; Feng Liu

doi:10.1117/12.2602306

9 October 2021 Manipulating the crystalline morphology in the non-fullerene acceptor mixture to accelerate the carrier transport and suppress the energetic disorder

Ming Zhang, Lei Zhu, Feng Liu

Author Affiliations +

Proceedings Volume 11893, Photonics for Energy; 118931G (2021) https://doi.org/10.1117/12.2602306
Event: SPIE/COS Photonics Asia, 2021, Nantong, JS, China

Conference Poster

Abstract

The intrinsic electronic structure of the donor and acceptor materials in the framework of the morphological features determine the output of organic solar cells (OSCs). Constructing the eutectic mixing based on the non-fullerene acceptors (NFAs) could fine-tune the bulk heterojunction (BHJ) thin film morphology as well as their electronic properties. With the formation of large amounts of crystallites, thin film crystallinity is greatly enhanced, accelerating the transportation of the free carriers. The JSC and FF amplification is achieved due to the formation of this kind of eutectic fibrillar lamellae structure, where efficient exciton dissociation occurs with reduced bimolecular and trap-assisted recombination. Suppressed non-radiative energy loss accounts for high VOC, enabling an improved power conversion efficiency (PCE) of 17.86%. These results reveal the basic importance of constructing a well-suited morphology to explore the details of the ultrafast photoelectric process and energy loss mechanism, which is of high demand in next episode OSC fabrication towards commercialization.

Citation Download Citation

Ming Zhang, Lei Zhu, and Feng Liu "Manipulating the crystalline morphology in the non-fullerene acceptor mixture to accelerate the carrier transport and suppress the energetic disorder", Proc. SPIE 11893, Photonics for Energy, 118931G (9 October 2021); https://doi.org/10.1117/12.2602306

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