Accurate spectral response measurements of a complementary absorbing organic tandem cell with fill factor exceeding the subcells

作者：Cheyns David^*; Kim Minjae; Verreet Bregt; Rand Barry P

来源：Applied Physics Letters, 2014, 104(9): 093302.

DOI：10.1063/1.4867261

Single heterojunction organic photovoltaic cells based on co-evaporated donor-acceptor layers with power conversion efficiencies (eta) above 5.5% are demonstrated, using either high (1.8 eV) or low (1.4 eV) optical gap materials. The high energy absorbing cell utilizes a high fullerene-C-70 content, in combination with a high mobility amorphous donor, while the low energy absorbing cell consists of a donor-acceptor molecule paired with C-60 as the acceptor. The integration of the two cells in an optimized tandem configuration leads to eta = 7.2%, verified by external quantum efficiency measurements of the subcells. Notably, the fill-factor of the tandem stack is higher than either one of the sub-cells.

• 出版日期2014-3-3