A mixed-cation lead mixed-halide perovskite absorber for tandem solar cells

Abstract

Metal halide perovskite photovoltaic cells could potentially boost the efficiency of commercial silicon photovoltaic modules from ∼20 toward 30% when used in tandem architectures. An optimum perovskite cell optical band gap of ~1.75 electron volts (eV) can be achieved by varying halide composition, but to date, such materials have had poor photostability and thermal stability. Here we present a highly crystalline and compositionally photostable material, [HC(NH2)2](0.83)Cs(0.17)Pb(I(0.6)Br(0.4))3, with an optical band gap of ~1.74 eV, and we fabricated perovskite cells that reached open-circuit voltages of 1.2 volts and power conversion efficiency of over 17% on small areas and 14.7% on 0.715 cm(2) cells. By combining these perovskite cells with a 19%-efficient silicon cell, we demonstrated the feasibility of achieving >25%-efficient four-terminal tandem cells.

Cite this paper

Related papers

1. Efficient Hybrid Solar Cells Based on Meso-Superstructured Organometal Halide Perovskites2012
2. Electron-Hole Diffusion Lengths Exceeding 1 Micrometer in an Organometal Trihalide Perovskite Absorber2013
3. A review of electrode materials for electrochemical supercapacitors2011
4. Conjugated Polymer-Based Organic Solar Cells2007
5. Cesium-containing triple cation perovskite solar cells: improved stability, reproducibility and high efficiency2016