Wu Hongbo, Lu Hao, Li Yungui, Zhou Xin, Zhou Guanqing, Pan Hailin, Wu Hanyu, Feng Xunda, Liu Feng, Vandewal Koen, Tress Wolfgang, Ma Zaifei, Bo Zhishan, Tang Zheng
State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, Center for Advanced Low-dimension Materials, College of Materials Science and Engineering, Donghua University, Shanghai, 201620, PR China.
Key Laboratory of Energy Conversion and Storage Materials, College of Chemistry, Beijing Normal University, 100875, Beijing, PR China.
Nat Commun. 2024 Mar 27;15(1):2693. doi: 10.1038/s41467-024-46797-5.
Enhancing the device electroluminescence quantum efficiency (EQE) is a critical factor in mitigating non-radiative voltage losses (V) and further improving the performance of organic solar cells (OSCs). While the common understanding attributes EQE in OSCs to the dynamics of charge transfer (CT) states, persistent efforts to manipulate these decay dynamics have yielded limited results, with the EQE of high-efficiency OSCs typically remaining below 10%. This value is considerably lower than that observed in high efficiency inorganic photovoltaic devices. Here, we report that EQE is also influenced by the dissociation rate constant of singlet states (k). Importantly, in contrast to the traditional belief that advocates maximizing k for superior photovoltaic quantum efficiency (EQE), a controlled reduction in k is shown to enhance EQE without compromising EQE. Consequently, a promising experimental approach to address the V challenge is proposed, resulting in a significant improvement in the performance of OSCs.
提高器件的电致发光量子效率（EQE）是减轻非辐射电压损失（V）并进一步提高有机太阳能电池（OSC）性能的关键因素。虽然通常认为OSC中的EQE归因于电荷转移（CT）态的动力学，但为操纵这些衰减动力学所做的持续努力成果有限，高效OSC的EQE通常仍低于10%。该值远低于高效无机光伏器件中的观测值。在此，我们报告EQE还受单重态解离速率常数（k）的影响。重要的是，与传统观念主张最大化k以实现卓越的光伏量子效率（EQE）相反，研究表明可控地降低k能在不降低EQE的情况下提高EQE。因此，提出了一种有前景的实验方法来应对V挑战，从而显著提高了OSC的性能。
