Adjusting the Active Layer Morphology via an Amorphous Acceptor Solid Additive for Efficient and Stable Nonfullerene Organic Solar Cells. Issue 11 (15th September 2021)

• Record Type: Journal Article
• Authors: You, Wen; Zhou, Dan; Hu, Lin; Xu, Haitao; Tong, Yongfen; Hu, Bin; Xie, Yu; Li, Zaifang; Li, Mingjun; Chen, Lie
• Is Part Of: Solar RRL. Volume 5:Issue 11(2021)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2021-09-15
• Subjects: morphologies -- nonfullerene organic solar cells -- solid additives -- stabilities; Solar energy -- Periodicals; Photovoltaic power generation -- Periodicals; Solar energy -- Research -- Periodicals; Photovoltaic power generation -- Research -- Periodicals; Periodicals; 333.7923
• DOI: 10.1002/solr.202100532
• Languages: English
• ISSNs: 2367-198X

Abstract

Abstract : It is incredibly feasible and effective to adopt a solid additive strategy to optimize the active layer blend films morphology for nonfullerene organic solar cells (OSCs) to achieve high efficiency and stable performance. Herein, a novel amorphous small molecule SJ‐IC‐M with a comparatively high molecular weight is first designed and used as an efficient solid additive in the OSCs based on PM6:Y6 to enhance the power conversion efficiency (PCE) and long‐term stability of the device. After the addition of 0.5 wt% SJ‐IC‐M into the active layer blends, the PCE can be increased to 16.2% compared with that of the reference device without additive displaying an inferior PCE of 15.0%. Moreover, the device containing the SJ‐IC‐M additive delivers more excellent long‐term stability. The PCE can remain over 90% of its initial value when the unencapsulated device is preserved in a N2 ‐filled glovebox for a month. Systematic analysis reveals that the introduction of the relatively high molecular weight amorphous SJ‐IC‐M additive can optimize the crystallinity of Y6. As a result, an improved charge transport, stabilized blend morphology, and enhanced device performance are achieved. Moreover, the current research provides a new strategy which can replace the commonly used solvent additive to fabricate efficient and stable nonfullerene OSCs. Abstract : An amorphous small molecule with high molecular weight is first designed and used as a solid additive to regulate the phase separation and molecular packing of the PM6:Y6 blends for efficient and stable nonfullerene organic solar cells.