A simple merocyanine tandem solar cell with extraordinarily high open-circuit voltage

作者：Steinmann V^*; Kronenberg N M; Lenze M R; Graf S M; Hertel D; Buerckstuemmer H; Wuerthner F; Meerholz K

来源：Applied Physics Letters, 2011, 99(19): 193306.

DOI：10.1063/1.3657145

We present a highly efficient tandem solar cell based on a merocyanine dye, containing two identical subcells connected in series. A recombination layer of Al/MoO(3) was used. Due to a substantial improvement of the fill factor, the overall efficiency of the tandem cell was even higher than that of the single-cell reference with identical active layer thickness. By combining the planar heterojunction and the bulk heterojunction concept, efficiencies up to 4.8% were achieved while maintaining a rather simple, fully vacuum-processed device stack consisting of only four organic layers. The optimized open-circuit voltage was as large as 2.1V.

• 出版日期2011-11-7