有機薄膜太陽電池の現状と将来展望(<特集>次世代太陽電池)

概要

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Organic photovoltaic cells are much attractive feature such as flexible, light-weight, colorful, low-cost, etc. For practical use of organic photovoltaic cells (OPV), it is important to study on the high efficiency, the long-term stability, and large-area modules. Improving the efficiency of OPV, we have newly explored p-type conjugated polymers such as PCPDTBT. PTB7, and n-type fullerene-based molecules such as PCBM, ICBM, for formation of an excellent bulk hetero-junction. Up to the efficiency of 10%, it is necessary to develop the electrical and optical buffer layers between active layer and electrodes, and tandem configuration, etc. Also, researches on the stability of OPV have been performed so that the degradation mechanism and key technologies for improving the long-term stability are still unclear. In this study, we investigated micro defects of polymer-based OPV by EL imaging combined with morphological observations by cross-sectional transmission electron microscopy (TEM). We found a lot of dark spots in the EL image of OPV as an initial degradation area. By eliminating degradation spots, the long-term stability could be improved. In this review, we summarized the research strategy for high efficiency and long-term stability of OPV.
2012-05-20