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Confocal and Near-field Spectroscopic Investigation of P3HT:PCBM Organic Blend Film upon Thermal Annealing

机译:P3HT:PCBM有机共混膜热退火后的共焦和近场光谱研究

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The poly(3-hexylthiophene) (P3HT) and [6,6]-phenyl C61 butyric acid methyl ester (PCBM) organic films are widely employed as electronic donor and acceptor in the field of organic film solar cell because of their high photovoltaic conversion efficiency. A home-built parabolic mirror assisted confocal and apertureless near-field optical microscope was used to investigate the degradation behavior of the film and to distinguish the donor and acceptor domains both topographically and optically. Under ambient condition, the degradation rates are decreased in the sequence of pristine P3HT, blend P3HT:PCBM film and pristine PCBM. N_2 protection dramatically slows down the film degradation rate. Using confocal spectroscopic mapping, we are able to distinguish the local distributions of P3HT and PCBM. Micrometer PCBM aggregates were observed due to the thermal annealing process. Our experimental methods show the possibility to investigate morphology and the photochemistry properties of the organic solar cell films with high spatial resolution.
机译:聚(3-己基噻吩)(P3HT)和[6,6]-苯基C61丁酸甲酯(PCBM)有机膜由于其高光电转换率而被广泛用作有机膜太阳能电池领域的电子供体和受体。效率。用自制的抛物面镜辅助的共焦无孔近场光学显微镜研究了薄膜的降解行为,并在形貌和光学上区分了供体和受体域。在环境条件下,原始P3HT,混合P3HT:PCBM膜和原始PCBM的顺序降解速率降低。 N_2保护大大降低了薄膜的降解速度。使用共焦光谱映射,我们能够区分P3HT和PCBM的局部分布。由于热退火过程,观察到了微米级PCBM聚集体。我们的实验方法显示了研究具有高空间分辨率的有机太阳能电池膜的形态和光化学性质的可能性。

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