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Abstract Tandem type organic solar cell consisting of two combined unit cells was fabricated. Each unit cell was two-layer organic solar cell composed of metal-free phthalocyanine and perylene tetracarboxylic derivative. When ultra-thin Au layer was inserted between unit cells, photovoltage increased about 2 times, while photocurrent density was much dependent on the thickness of the inserted Au layer.
Hiramoto et al. (Thu,) studied this question.