Abstract
In this work, the power conversion efficiency (PCE) of bulk heterojunction organic solar cell is improved by adding PEG (polyethylene glycol) in the solution of P3HT and PCBM blend. The short circuit current and fill factor are increased by adding PEG with the molecular weight of 300, whereas the open circuit voltage is not changed. On the other hand, PCE becomes worse by adding PEG with the molecular weight of 6000. It was observed by field-emission scanning electron microscopy that the additional layer was formed under the active layer during spin coating by phase separation. The stability of solar cell is also improved with introducing the PEG layer. These results were explained by the formation of the PEG interfacial layer under the P3HT:PCBM active layer, which acts as a hole transport layer and also blocks the water diffusion from PEDOT:PSS toward the metal electrode.
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