Ware Washat, Wright Tia, Mao Yimin, Han Shubo, Guffie Jessa, Danilov Evgeny O, Rech Jeromy, You Wei, Luo Zhiping, Gautam Bhoj
Department of Chemistry, Physics and Materials Science, Fayetteville State University, Fayetteville, NC 28301, USA.
NIST Center for Neutron Research, National Institute of Standards and Technology, 100 Bureau Drive, Gaithersburg, MD 20899, USA.
Polymers (Basel). 2020 Dec 30;13(1):115. doi: 10.3390/polym13010115.
Optimization of charge generation in polymer blends is crucial for the fabrication of highly efficient polymer solar cells. While the impacts of the polymer chemical structure, energy alignment, and interface on charge generation have been well studied, not much is known about the impact of polymer aggregation on charge generation. Here, we studied the impact of aggregation on charge generation using transient absorption spectroscopy, neutron scattering, and atomic force microscopy. Our measurements indicate that the 1,8-diiodooctane additive can change the aggregation behavior of poly(benzodithiophene-alt-dithienyl difluorobenzotriazole (PBnDT-FTAZ) and phenyl-C61-butyric acid methyl ester (PCBM)polymer blends and impact the charge generation process. Our observations show that the charge generation can be optimized by tuning the aggregation in polymer blends, which can be beneficial for the design of highly efficient fullerene-based organic photovoltaic devices.
聚合物共混物中电荷产生的优化对于高效聚合物太阳能电池的制造至关重要。虽然聚合物化学结构、能量排列和界面在电荷产生方面的影响已得到充分研究，但对于聚合物聚集对电荷产生的影响却知之甚少。在此，我们利用瞬态吸收光谱、中子散射和原子力显微镜研究了聚集对电荷产生的影响。我们的测量表明，1,8 - 二碘辛烷添加剂可改变聚（苯并二噻吩 - 交替 - 二噻吩基二氟苯并三唑）（PBnDT - FTAZ）和苯基 - C61 - 丁酸甲酯（PCBM）聚合物共混物的聚集行为，并影响电荷产生过程。我们的观察结果表明，通过调节聚合物共混物中的聚集可以优化电荷产生，这对于高效富勒烯基有机光伏器件的设计可能是有益的。
