The nanoscale morphology of poly(3-hexylthiophene) (P3HT) and [,]-phenyl-C71. butyric acid methylester (PCBM) blend film is affected by various parameters such as the solvent, coating, and thermal annealing conditions. We investigated the effect of solvents on the performance of inverted solar cells based on the active layer of a P3HT:PCBM bulk heterojunction. P3HT and PCBM (weight ratio 1:0.8) were dissolved in chlorobenzene (CB) and dichlorobenzene (DCB). The difference in the volatility characteristics of the solvents resulted in different P3HT crystallite morphologies. The difference in the P3HT:PCBM film morphology was systemically investigated via atomic force microscopy, ultraviolet (UV)-visible absorption spectroscopy, X-ray diffraction, and electrical impedance spectroscopy. The DCB solvent lead to better P3HT crystallinity and device performance. For example, the short-circuit current density (JSC) and the power conversion efficiency (PCE) of the device using DCB (9.89 mA/cm2 and 3.62%, respectively) were larger than those (9.12 mA/cm2 and 3.01%) of the device using CB.
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机译：聚（3-己基噻吩）（P3HT）和[，]-苯基-C71的纳米级形态。丁酸甲酯（PCBM）混合膜会受到各种参数的影响，例如溶剂，涂层和热退火条件。我们基于P3HT：PCBM本体异质结的有源层，研究了溶剂对倒置太阳能电池性能的影响。将P3HT和PCBM（重量比为1：0.8）溶解在氯苯（CB）和二氯苯（DCB）中。溶剂挥发性特征的差异导致不同的P3HT晶体形态。通过原子力显微镜，紫外线（UV）-可见吸收光谱，X射线衍射和电阻抗光谱系统地研究了P3HT：PCBM膜形态的差异。 DCB溶剂可导致更好的P3HT结晶度和器件性能。例如，使用DCB的设备的短路电流密度（JSC）和功率转换效率（PCE）分别为（9.89 mA / cm 2 和3.62％）大于（9.12）使用CB的设备的mA / cm 2 和3.01％）。
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