Andre Weiss

Efficient and long-term stable organic vacuum deposited tandem solar cells

We report on latest progress in the field of p-i-n type tandem solar cells. An optimized tandem cell architecture with two complementary absorbing bulk heterojunctions leads to a certified power conversion efficiency of 5.9% on 2 cm2 active area. Moreover, we show that p-i-n type tandem solar cells can be extremely stable: Extrapolated lifetimes corresponding to more than 30 years of sun illumination have been achieved. Furthermore, we show that efficiency and stability only slightly decrease when transferring the cell architecture to large serially interconnected modules of more than 100 cm² area.

Efficient organic vacuum deposited tandem solar cells and modules

We report on the latest progress in the field of organic p-i-n tandem solar cells. The results of tandem solar cells with an efficiency of 9.8% are shown (certified by Fraunhofer ISE) with an active area of about 1.1 cm2. These solar cells show a promising intrinsic stability: a relative reduction of 5.7% of its initial power conversion efficiency was measured when stored at 85°C for 2400 hours. Additionally, we present a small OPV module with an active area of 122cm2 showing an efficiency of with 9%, and an excellent low light behavior. Furthermore, we present the latest results on optimized tandem solar cells showing a power conversion efficiency of 10.7 % (measured by SGS, accredited and independent testing facility, active area of 1.1cm2).