中文摘要：

为探究有机太阳电池活性层聚集体结构与器件效率的关系，本文以丙酮和正己烷为不良溶剂，诱导聚（3-己基噻吩）（P3HT）分子结晶，通过改变两种溶剂的滴加时长，制备了一系列尺寸均匀、分散性好以及分子排列有序的P3HT纳米颗粒。利用原子力显微镜（AFM），紫外可见光谱仪（UV—Vis），X射线衍射仪（XRD）等手段表征了纳米颗粒的尺寸、形貌和结晶有序性。将P3HT纳米颗粒和[6，6]-苯基-C61-丁酸甲酯（PCBM）混合成膜制备了本体异质结有机太阳电池，发现基于尺寸相近但沿π-π堆砌方向结晶更有序的P3HT纳米颗粒的器件显示更高的光电转换效率。

英文摘要：

To explore the relationship between the aggregate structure of active layers and the power conversion efficiency （PCE） of organic solar cells （OSCs）, serials of poly （3-hexylthiophene） （P3HT） nanoparticles （NPs） with uniform size, good dispersity and ordered molecular packing were prepared via adding poor solvent of acetone or n-hexane into P3HT chloroform solution with different dropping times. Atomic force microscope （AFM）, ultraviolet-visible （UV-Vis）absorption spectroscopy and X-ray diffraction were used to characterize the size, morphology and crystallinity of P3HT NPs. Blending P3HT NPs with [6,6]-phenyl-C61- butyric acid methyl ester （PCBM） as active layer, we fabricated serials of bulk-heterojunction OSCs and found that the devices based on P3HT NPs with similar size but ordered structure along π-π stacking direction showed better performance.