Author:

Keywords:

Science & Technology, Physical Sciences, Physics, Applied, Physics, ELECTRON-ACCEPTOR, SUBPHTHALOCYANINE, POLYMER, PHOTOVOLTAICS, 02 Physical Sciences, 09 Engineering, 10 Technology, Applied Physics, 40 Engineering, 51 Physical sciences

Abstract:

We demonstrate a cascade architecture for organic solar cells with two planar donor/acceptor (DA) heterojunctions operating in series. In a 3-layered structure, subphthalocyanine (SubPc) acts as an ambipolar interlayer between a tetracene (Tc) donor and a C 60 acceptor. The Tc/SubPc and SubPc/C 60 interfaces are both able to contribute to the photocurrent, which results in a short-circuit current in the 3-layer cascade cell larger than in any of the constituent bi-layer DA combinations. Furthermore, the open-circuit voltage is increased due to reduced recombination losses at the DA interface. © 2012 American Institute of Physics.