The Dependence of Donor: Acceptor Ratio on the Photovoltaic Performances of Blended poly (3-octylthiophene-2,5-diyl) and (6,6)-phenyl C_(71) butyric acid methyl ester Bulk Heterojunction Organic Solar Cells

摘要

Bulk heterojunction organic solar cells using blended poly (3-octylthiophene-2,5-diyl)(P30T) and (6,6)-phenyl C_(71) butyric acid methyl ester (PC_(71)BM) have been fabricated. P30T and PC_(71)BM were used as the electron donor (D) and acceptor (A), respectively. Both materials were mixed and dissolved in dichlorobenzene with three different D:A ratios i.e. 1:3, 1:1 and 3:1 (weight) while maintained at the concentration of 2 wt % (26 mg/ml). The blended thin films were sandwiched between the indium tin oxide (ITO) coated glass and the aluminum film. This paper reports the influence of donor acceptor ratio on the performance of solar cell devices measured by current-voltage measurement both in the dark and under 1.5 AM solar illumination. It was found that all devices showed the photovoltaic effect with poor diode behavior and the donor:acceptor ratio significantly influenced on the performance of bulk heterojunction organic solar cells.