High efficiency organic solar cells by screen printing method

This study relates to a bulk heterojunction organic solar cells, more specifically, it relates to the fabrication method of a bulk heterojunction organic solar cells employing conjugated polymers as a donor and the derivatives of fullerenes as an acceptor. For the low cost production of the organic solar cells, some printing methods has been studied. In order to verify whether a highly efficient organic solar cells can be obtained also in the printing method or not, we chose a screen printing method for making a MDMO-PPV/PCBM bulk heterojunction type organic solar cells and investigated the relations among printing conditions, solar cell characteristics, and cell structures. As a result, by optimizing printing conditions, we obtained excellent characteristics as an organic solar cell wherein its active layer was deposited by the screen printing method. We attained 2.35% of conversion efficiency under AM 1.5 100 mW/cm/sup 2/, 5.06 mA/cm/sup 2/ of Jsc, 0.821 V of Voc, 0.566 of FF and 82 nm of film thickness in 6 mm/sup 2/ of photo active area. Consequently, we confirmed that screen printing is useful as a fabrication method for solar cells also in the solar cell characteristics.