Nanostructure parallel tandem organic solar cell with combination of planer and bulk heterojunction sub-cells

A parallel tandem solar cell based on a combination of Zinc phthalocyanine (ZnPc) and poly(3-hexylthiophene-2,5-diyl) (P3HT) has been fabricated and characterized. The absorption spectrum of P3HT:PCBM andZnPc complements each other, making them appropriate for the use in a single device to expend the absorption spectra.Compared to a traditional series tandem cells, parallel tandem cells eliminate the need for a semitransparentrecombination layer, reducing the complexity of device fabrication while still providing an excellent increase in adevice performance. Enhancement of a short circuit current density was observed in the prepared tandem structure. Thecurrent density of tandem cell was nearly the sum of those of the sub-cells of ZnPc/PCBMand P3HT:PCBM.

Keywords:

polymer solar cells , tandem solar cells , nanostructure , bulk heterojunction