Design of low-cost non-fused ultranarrow-band-gap acceptors for versatile photovoltaic applications

IF 38.6 1区 材料科学 Q1 CHEMISTRY, PHYSICAL
Joule Pub Date : 2024-08-21 DOI:10.1016/j.joule.2024.05.011
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Abstract

Ultranarrow-band-gap organic semiconductors with fully non-fused conjugated structures display great potential for low-cost organic photoelectric devices. Here, we developed two fully non-fused acceptors, namely, A4T-7 and A4T-12, by introducing different alkoxyl side chains on the π-bridges of the non-fused acceptors. The resulting materials demonstrate ultranarrow optical band gaps of 1.15 and 1.21 eV, respectively. Compared with other ultranarrow-band-gap acceptors constructed with fully fused-ring or partially fused-ring structures, the synthetic complexity of the two acceptors is significantly reduced. Specifically, A4T-7, with symmetric alkoxy chains on the π-bridge, exhibits a more planar molecular configuration compared with A4T-12. Notably, the organic photovoltaic cells based on A4T-7 show a power conversion efficiency of 13.3%. Moreover, cells fabricated with a highly transparent active layer, characterized by an average visible transmittance value of approximately 62.7%, achieve an efficiency of 10.7%. These results represent the highest reported efficiencies for cells utilizing fully non-fused acceptors with ultranarrow band gaps.

Abstract Image

Abstract Image

为多功能光伏应用设计低成本非熔融超宽带隙受体
具有完全非融合共轭结构的超宽带隙有机半导体在低成本有机光电器件方面具有巨大潜力。在这里,我们通过在非融合受体的 π 桥上引入不同的烷氧基侧链,开发出了两种完全非融合受体,即 A4T-7 和 A4T-12。这两种材料的超窄光带隙分别为 1.15 和 1.21 eV。与其他完全熔环或部分熔环结构的超宽带隙受体相比,这两种受体的合成复杂性大大降低。具体来说,与 A4T-12 相比,π 桥上带有对称烷氧基链的 A4T-7 显示出更平面的分子构型。值得注意的是,基于 A4T-7 的有机光伏电池的功率转换效率高达 13.3%。此外,使用高透明活性层制造的电池(平均可见光透射率约为 62.7%)的效率也达到了 10.7%。这些结果代表了利用具有超窄带隙的完全非熔化受体的电池的最高效率。
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来源期刊
Joule
Joule Energy-General Energy
CiteScore
53.10
自引率
2.00%
发文量
198
期刊介绍: Joule is a sister journal to Cell that focuses on research, analysis, and ideas related to sustainable energy. It aims to address the global challenge of the need for more sustainable energy solutions. Joule is a forward-looking journal that bridges disciplines and scales of energy research. It connects researchers and analysts working on scientific, technical, economic, policy, and social challenges related to sustainable energy. The journal covers a wide range of energy research, from fundamental laboratory studies on energy conversion and storage to global-level analysis. Joule aims to highlight and amplify the implications, challenges, and opportunities of novel energy research for different groups in the field.
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