Li Zicha, Song Dandan, Xu Zheng, Qiao Bo, Zhao Suling, Wageh S, Al-Ghamdi Ahmed A, Huo Xiaomin
Key Laboratory of Luminescence and Optical Information, Beijing Jiaotong University, Ministry of Education, Bejjing 100044, China.
Department of Physics, Faculty of Science, King Abdulaziz University, Jeddah 21589, Saudi Arabia.
Polymers (Basel). 2021 Jul 22;13(15):2398. doi: 10.3390/polym13152398.
Although reported ternary polymer solar cells have higher power conversion efficiency than binary polymers, the mechanism of exciton separation and charge transport in this complex ternary system is still unclear. Herein, based on PM6:Y6:ITIC-M ternary solar cells, we combine the technique of luminescence spectroscopy, including electroluminescence (EL) and photoluminescence (PL) with photovoltaic measurements, to understand clearly the detailed roles of ITIC-M as the third component in the contribution of device performance. The results show that ITIC-M can form the alloy-like composite with Y6 but leave individual Y6 acceptor to conduct charge transfer with PM6 donor, which improves but decreases because of poor charge transfer capacity of ITIC-M. Meanwhile, the energy transfer from PM6 to ITIC-M exists in the active layers; small IE suppresses exciton dissociation. Deteriorating performance of solar cells demonstrates that, except for complementary absorption spectrum and suitable energy levels in PM6:Y6:ITIC-M system, the synergetic effects of carrier dynamics among different organic materials play an important role in influencing the performance of ternary solar cells.
尽管报道的三元聚合物太阳能电池比二元聚合物具有更高的功率转换效率，但在这种复杂的三元体系中激子分离和电荷传输的机制仍不清楚。在此，基于PM6:Y6:ITIC-M三元太阳能电池，我们将发光光谱技术，包括电致发光（EL）和光致发光（PL）与光伏测量相结合，以清楚地了解ITIC-M作为第三组分在器件性能贡献中的详细作用。结果表明，ITIC-M可以与Y6形成类合金复合材料，但留下单独的Y6受体与PM6供体进行电荷转移，这由于ITIC-M的电荷转移能力差而提高了 但降低了 。同时，在活性层中存在从PM6到ITIC-M的能量转移；小的IE抑制激子解离。太阳能电池性能的恶化表明，除了PM6:Y6:ITIC-M体系中的互补吸收光谱和合适的能级外，不同有机材料之间载流子动力学的协同效应在影响三元太阳能电池性能方面起着重要作用。
