Yuan Dan, Chen Zhi-jian, Xiao Li-xin, Mu Li-ping, Qu Bo, Gong Qi-huang
State Key Laboratory for Mesoscopic Physics and Department of Physics, Peking University, Beijing 100871, China.
Guang Pu Xue Yu Guang Pu Fen Xi. 2011 Dec;31(12):3175-9.
The blend morphology and vertical arrangement are critical to the performance of organic bulk-heterojunction photovoltaic devices. In the present paper, the authors proposed a new annealing method that controls the blend morphology and vertical arrangement of two materials by means of simultaneously applying external electrical field and violet irradiation on the active layer of poly(3-hexylthiophene) (P3HT) and [6,6]-phenyl C61-butyric acid methyl ester (PCBM) during annealing process. By using this annealing method, the power conversion efficiency increased by 36%, which was caused by vertical phased-separated blend of crystalline P3HT and PCBM and better charge extraction of electrodes. X-ray photoelectron spectroscopy (XPS) was measured to prove more fullerene derivatives at the organic/cathode interfaces by using this annealing method. The X-ray diffraction (XRD) analysis and UV-Vis absorption spectrum analysis also revealed more ordered polymer crystallization.
共混物形态和垂直排列对于有机本体异质结光伏器件的性能至关重要。在本文中，作者提出了一种新的退火方法，该方法通过在退火过程中对聚（3-己基噻吩）（P3HT）和[6,6]-苯基C61-丁酸甲酯（PCBM）的活性层同时施加外部电场和紫光照射，来控制两种材料的共混物形态和垂直排列。通过使用这种退火方法，功率转换效率提高了36%，这是由结晶P3HT和PCBM的垂直相分离共混物以及电极更好的电荷提取所导致的。通过使用这种退火方法，测量了X射线光电子能谱（XPS）以证明在有机/阴极界面处有更多的富勒烯衍生物。X射线衍射（XRD）分析和紫外可见吸收光谱分析也揭示了聚合物结晶更加有序。
