We have investigated charge transport properties of bulk-heterojunction (BH) solar cells in which P3HT (Poly(3-hexylthiophene)) and PCBM ([6,6]-phenyl-C₆₁-butyric acid methyl ester) are used as the active layer, by using the displacement current measurement (DCM) method. In order to investigate the charge transport properties of the BH solar cells, we fabricated a dedicated device that consists of P3HT and PCBM, and used the DCM method to measure the charge distribution of the devices with different composition ratios of P3HT and PCBM. DCM data suggested that a BH film with 50 wt% of PCBM exhibits a preferable charge transport property suited for BH solar cells. We confirmed that the DCM results are consistent with the measured performance of the BH solar cells, indicating that the DCM method is a simple and effective method for optimizing the structure of BH solar cells as well as other electronic devices composed of binary materials.

我们研究了其中P3HT（聚（3-己基噻吩））和PCBM（[6,6]-苯基-C ₆₁-丁酸甲酯）用作活性层，方法是使用位移电流测量（DCM）方法。为了研究BH太阳能电池的电荷传输特性，我们制造了由P3HT和PCBM组成的专用器件，并使用DCM方法来测量具有不同P3HT和PCBM组成比的器件的电荷分布。DCM数据表明，PCBM含量为50 wt％的BH膜具有适合BH太阳能电池的优选电荷传输性能。我们确认DCM结果与BH太阳能电池的测量性能一致，这表明DCM方法是一种简单有效的方法，用于优化BH太阳能电池以及其他由二元材料组成的电子设备的结构。