Reducing non-radiative recombination energy loss via a fluorescence intensifier for efficient and stable ternary organic solar cells,Materials Horizons

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Reducing non-radiative recombination energy loss via a fluorescence intensifier for efficient and stable ternary organic solar cells
Materials Horizons ( IF 12.2 ) Pub Date : 2021-06-29 , DOI: 10.1039/d1mh00868d
Xuan Liu ₁ , Yang Liu , Yongfeng Ni , Ping Fu , Xuchao Wang , Qing Yang , Xin Guo , Can Li

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Increasing electroluminescene quantum efficiency (EQE_EL) of the photoactive layer to reduce non-radiative recombination energy loss (E_loss) has been demonstrated as an effective strategy to improve open-circuit voltage (V_oc) of organic solar cells (OSCs). Meanwhile, incorporating a third component into the active-layer film can improve power conversion efficiency (PCE) of resultant ternary OSCs, mostly contributed from increments in short-circuit current density and fill factor but less in the V_oc. Herein, we report a highly fluorescent molecule (IT-MCA) as a third component to reduce the E_loss and enhance the V_oc for ternary OSCs. Applying the IT-MCA to three binary hosts, a significant increase of V_oc (41 mV) is acquired and a best PCE of 16.7% is obtained with outstanding device stability. This work provides a new guideline to design the third-component molecule by enhancing its fluorescence for efficient and stable ternary OSCs with improved V_oc.

中文翻译：

通过荧光增强剂减少非辐射复合能量损失，用于高效稳定的三元有机太阳能电池

提高光敏层的电致发光量子效率 (EQE _EL ) 以减少非辐射复合能量损失 ( E _loss ) 已被证明是提高有机太阳能电池 (OSC)开路电压 ( V _oc )的有效策略。同时，在有源层薄膜中加入第三种成分可以提高所得三元 OSC 的功率转换效率 (PCE)，主要来自短路电流密度和填充因子的增加，但V _{oc 的增加}较少。在此，我们报告了一种高荧光分子（IT-MCA）作为第三种成分，以减少E_损失并增强V _oc对于三元 OSC。将 IT-MCA 应用于三个二进制主机，获得了V _oc (41 mV)的显着增加，并获得了 16.7% 的最佳 PCE，并具有出色的器件稳定性。这项工作为设计第三组分分子提供了新的指导方针，通过增强其荧光，以提高V _{oc 的}效率和稳定的三元 OSC 。

更新日期：2021-07-14

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