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首页> 外文期刊>Advanced Functional Materials >Influence of Solvent Mixing on the Morphology and Performance of Solar Cells Based on Polyfluorene Copolymer/Fullerene Blends
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Influence of Solvent Mixing on the Morphology and Performance of Solar Cells Based on Polyfluorene Copolymer/Fullerene Blends

机译：溶剂混合对基于聚芴共聚物/富勒烯共混物的太阳能电池的形态和性能的影响

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摘要

The influence of the solvent on the morphology and performance of polymer solar cells is investigated in devices based on blends of the polyfluorene copolymer, poly(2,7-(9,9-dioctyl-fluorene)-alt-5,5-(4',7'-di-2-thienyl-2',1',3'-benzothiadiazole)), and [6,6]-phenyl-C_(61)-butyric acid methyl ester. The blends are spin-coated from chloroform or from chloroform mixed with small amounts of xylene, toluene, or chlorobenzene. The devices are characterized under monochromatic light and solar illumination AM1.5 (AM: air mass). An enhancement of the photocurrent density is observed in diodes made from chloroform mixed with chlorobenzene, and reduced photocurrent density is observed in diodes made from chloroform mixed with xylene or toluene, compared to diodes made from neat chloroform. The open-circuit voltages are almost the same in all diodes. The surfaces of the active layers are imaged using atomic force microscopy. Height images indicate that a finer and more uniform distribution of domains corresponds to the diodes with enhanced photocurrent that are made from chloroform mixed with chlorobenzene. while a structure with larger domains is associated with the lower photocurrents in the diodes made from chloroform mixed with xylene or toluene. The influence of the morphology on the excited-state dynamics and charge generation is investigated using time-resolved spectroscopy. Fast formation of bound charge pairs followed by their conversion into free charge carriers is resolved, and excitation-intensity-dependent non-geminate recombination of free charges is observed. A significant enhancement in free-charge-carrier generation is observed on introducing chlorobenzene into chloroform. Imaging photocurrent generation from the solar cells with a light-pulse technique shows an inhomogeneous photocurrent distribution, which is related to the undulations in the thickness of the active layer. Thicker parts of the diodes yield higher photocurrent values.
机译：在基于聚芴共聚物，聚（2,7-（9,9-二辛基芴）-alt-5,5-（4）的共混物的设备中，研究了溶剂对聚合物太阳能电池的形态和性能的影响。 '，7'-二-2-噻吩基-2'，1'，3'-苯并噻二唑））和[6,6]-苯基-C_（61）-丁酸甲酯。从氯仿或与少量二甲苯，甲苯或氯苯混合的氯仿中旋涂共混物。该设备的特征是在单色光和日光AM1.5（AM：空气质量）的照射下。与由纯氯仿制成的二极管相比，在由氯仿与氯苯混合制成的二极管中观察到光电流密度的增加，在由与二甲苯或甲苯混合的氯仿制成的二极管中观察到光电流密度降低。所有二极管的开路电压几乎相同。使用原子力显微镜对活性层的表面成像。高度图表明，畴的更细，更均匀的分布对应于由氯仿与氯苯混合制成的光电流增强的二极管。而具有较大畴的结构与氯仿与二甲苯或甲苯混合制成的二极管中较低的光电流相关。使用时间分辨光谱学研究了形态对激发态动力学和电荷产生的影响。解决了快速形成结合电荷对，然后将其转化为自由电荷载流子的现象，并观察到激发强度依赖的自由电荷的非对接重组。将氯苯引入氯仿后，观察到自由载流子产生的显着增强。用光脉冲技术对太阳能电池产生的光电流进行成像显示出不均匀的光电流分布，这与有源层厚度的起伏有关。二极管的较厚部分产生较高的光电流值。

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