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It is required to improve the efficiency and the reliability of the polymer solar cells (PSCs) as the energy saving optical device for the future application of the smart farm facilities. In this study, we fabricated the bulk hetero junction PSCs with organic passivation film layer for the reliability improvement of the devices. The effects of the passivation layer on the electrical properties of the PSCs were studied. The materials of passivation layer are composed of poly vinyl alcohol (PVA) and ammonium dichromate, and the passivation films were fabricated by the spin coating method on the P3HT:PC BM/LiF/Al substrate. The prepared structure of the device is the glass/ITO/PEDOT:PSS/ P3HT:PC BM/LiF/Al/passivation layer. The performances of the PSCs with the organic passivation film showed better electrical properties compared with the PSCs without passivation layers. The power conversion efficiency (PCE) values of passivated PSCs decreased from 3.0 to 1.3% after air exposure for 140 hrs. In contrast, the PCE values for the devices without passivation decreased sharply from 3.5 to 0.1% under the same exposure condition.

Effects of Organic Passivation Films on Properties of Polymer Solar Cells with P3HT:PC61BM Active Layers

Effects of Organic Passivation Films on Properties of Polymer Solar Cells with P3HT:PC₆₁BM Active Layers