We investigate the open circuit voltage (VOC) of stacked bulk heterojunction (BHJ) organic solar cells based on conjugated polymer and fullerene derivative by spin-coating method. Poly[2-methoxy-5-(3′,7′-dimethyloctyloxy)-1,4-phenylene vinylene] (MDMO-PPV) blended with [6, 6]-phenyl C61-butyric acid methyl ester (PCBM) is used as a photoactive layer. The structure is ITO(lower BHJ cell)PEDOT:PSS/MDMO-PPV:PCBM/ITO/(upper BHJ cell)PEDOT:PSS/MDMO-PPV:PCBM/Al. VOC of the stacked cell is 1.34V and is about 1.6 times as large as that of single BHJ organic solar cell. VOC of the stacked cell is not proportional to the number of photoactive layers, but is the sum of the VOC values of the upper and the lower BHJ cells.
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Kawano et al. (2006) studied this question.
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