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

Journal article

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.

Authors: Haghighirad, A; McMeekin, D; Sadoughi, G; Rehman, W; Eperon, G

• Publication status: Published
• Peer review status: Peer reviewed
• Publisher: American Association for the Advancement of Science
• Journal: Science
• Volume: 351
• Issue: 6269
• Pages: 151-155
• Publication date: 2015-12-03
• Acceptance date: 2015-10-05
• DOI: 10.1126/science.aad5845
• EISSN: 1095-9203
• ISSN: 0036-8075
• Language: English