Suppressing Bimolecular Charge Recombination and Energetic Disorder with Planar Heterojunction Active Layer Enables 18.1% Efficiency Binary Organic Solar Cells,ACS Materials Letters

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Suppressing Bimolecular Charge Recombination and Energetic Disorder with Planar Heterojunction Active Layer Enables 18.1% Efficiency Binary Organic Solar Cells
ACS Materials Letters ( IF 9.6 ) Pub Date : 2023-05-17 , DOI: 10.1021/acsmaterialslett.3c00236
Zhenmin Zhao ₁ , Jingjing Zhao ₁ , Sein Chung ₂ , Kilwon Cho ₂ , Weidong Xu ₃ , Zhipeng Kan _{1,

4}

Affiliation

The performance of organic solar cells has been dramatically enhanced due to the use of bulk heterojunction active layer structure. However, blending donor and acceptor in the bulk volume results in a large extent of bimolecular charge recombination and increasing energetic disorder. Herein, we fabricated organic solar cells with polymer donor PM6 and nonfullerene acceptor N3 in bilayer structure to investigate the impact of planar heterojunction configurations on charge recombination and energetic landscapes. We find superior crystallinity features in the bilayer composed of pure donor and acceptor layers. The bimolecular charge recombination and energetic disorder are effectively suppressed compared with the bulk heterojunction counterparts. Thus, a power conversion efficiency as high as 18.1% (17.8% averaged) is achieved, which stands among the top values of planar heterojunction organic solar cells. In addition, improved device shelf stability is observed because of the fewer donor–acceptor interfaces in the active layer. Our results suggest that a planar heterojunction structure could efficiently suppress the bimolecular charge recombination and energetic disorder, providing an alternative pathway for developing solution-processed organic solar cells.

中文翻译：

用平面异质结有源层抑制双分子电荷复合和能量紊乱使效率为 18.1% 的二元有机太阳能电池成为可能

由于使用本体异质结活性层结构，有机太阳能电池的性能得到了显着提高。然而，在大体积中混合供体和受体会导致很大程度的双分子电荷重组和增加能量紊乱。在此，我们用双层结构的聚合物供体 PM6 和非富勒烯受体 N3 制造了有机太阳能电池，以研究平面异质结配置对电荷复合和能量景观的影响。我们在由纯供体层和受体层组成的双层中发现了优异的结晶度特征。与本体异质结对应物相比，双分子电荷重组和能量紊乱得到有效抑制。因此，实现了高达 18.1%（平均 17.8%）的功率转换效率，这在平面异质结有机太阳能电池中名列前茅。此外，由于活性层中的供体-受体界面较少，因此观察到设备的储存稳定性得到改善。我们的研究结果表明，平面异质结结构可以有效地抑制双分子电荷重组和能量紊乱，为开发溶液处理的有机太阳能电池提供了一条替代途径。

更新日期：2023-05-17

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