High-Efficiency Si Perovskite Tandem Solar Cells Extra Large

The IEA has reported in its “Renewables 2019” report that a solar PV capacity growth of 700-880 GW is expected until 2024 [1]. Current Si PV technology has a mainstream efficiency of ~22%, which would increase up to an economically feasible efficiency of 24-25% [2]. A proven method to improve the power output is to create tandem devices. In this context, perovskite/c-Si tandem technology can make an impact: the high-power output, results in a lower footprint for PV systems, and offers a route to lower the levelized cost of electricity.

Within HIPER XL, the consortium (see figure 1) will demonstrate environmentally benign, stable, efficient and cost effective, four terminal (4T) bifacial hybrid tandem solar cells with unprecedented power output, manufactured with scalable process routes. The concept of bifacial perovskite/c-Si tandem modules was published for the first time by HIPER XL consortium members in April 2020 [3]. Our preliminary investigations resulted in a device with a power output of 30.5 mW/cm2 for lab-scale cells under BiFi200 conditions.