We demonstrate the influence of a light-soaking treatment on current-voltage characteristics, external quantum efficiency and dielectric response of an encapsulated P3HT:PCBM bulk heterojunction inverted organic solar cell. Furthermore, we apply dielectric permittivity and electric modulus approaches to identify relaxation peaks observed in this device. We discuss previously reported explanations of the light-soaking effect on the basis of our experimental results, showing that the light-soaking effect originates from dipole formation at the ZnO/P3HT:PCBM interface. In addition, we find that metal oxide hole and electron selective layers prevent the P3HT:PCBM molecules' reorientations and, thus, enhance its thermal stability. This type of experimental observations are expected to provide new prospective on the fundamental aspect of elementary charge transfer modifications in organic solar cells.

我们证明了光浸泡处理对封装的P3HT：PCBM本体异质结倒置有机太阳能电池的电流-电压特性，外部量子效率和介电响应的影响。此外，我们应用介电常数和电模量方法来确定在该器件中观察到的弛豫峰。我们根据实验结果讨论先前报道的吸光效果的解释，这些结果表明吸光效果源自ZnO / P3HT：PCBM界面的偶极子形成。此外，我们发现金属氧化物空穴和电子选择性层阻止了P3HT：PCBM分子的重新取向，从而增强了其热稳定性。