High-efficiency, vacuum-deposited small-molecule organic tandem and triple-junction photovoltaic cells are demonstrated. The devices are composed of two sub-cells with minimal absorption spectral overlap. A nearly transparent fullerene/wide-energy gap organic mixture is introduced as the interconnecting blocking layer to further reduce cell losses. A power conversion efficiency of 10.0% is achieved for the tandem cell and 11.1% is achieved for a triple-junction cell.
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Che et al. (2014) studied this question.
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