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.
Symonowicz, J., Morawski, M., Dusza, M., Peksa, P., Sieradzki, A. and Granek, F., 2017. Investigation of the light-soaking effect in organic solar cells using dielectric permittivity and electric modulus approaches. Organic Electronics.
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