Solution-Processed All-Perovskite Multi-Junction Solar Cells
David McMeekin a b, Suhas Mahesh a, Nakita Noel a, Matthew Klug a, JongChul Lim a, Jonathan Warby a, James Ball a, Laura Herz a, Michael Johnston a, Henry Snaith a
a Clarendon Laboratory, Department of Physics, Oxford University, Oxford OX1 3PU, UK
b ARC Centre of Excellence in Exciton Science, Department of Chemical Engineering, Monash University, Clayton, VIC, Australia
Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV19)
Roma, Italy, 2019 May 12th - 15th
Organizers: Prashant Kamat, Filippo De Angelis and Aldo Di Carlo
Oral, David McMeekin, presentation 099
Publication date: 11th February 2019

Multi-junction device architectures can increase the power conversion efficiency (PCE) of photovoltaic (PV) cells beyond the single-junction thermodynamic limit. However, these devices are challenging to produce by solution-based methods, where dissolution of underlying layers is problematic. By employing a highly volatile acetonitrile(CH3CN)/methylamine(CH3NH2) (ACN/MA) solvent-based perovskite solution, we demonstrate fully solution-processed absorber, transport and recombination layers for monolithic all-perovskite tandem and triple-junction solar cells. By combining FA0.83Cs0.17Pb(Br0.7I0.3)3 (1.94 eV) and MAPbI3 (1.57 eV) junctions, we reach two-terminal tandem PCEs of over 15 % (steady-state). We show that a MAPb0.75Sn0.25I3 (1.34 eV) narrow band gap perovskite can be processed via the ACN/MA solvent-based system, demonstrating the first, proof-of-concept, monolithic all-perovskite triple-junction solar cell with an open-circuit voltage reaching 2.83 V. Through optical and electronic modeling, we estimate the achievable PCE of a state-of-the-art triple-junction device architecture to be 26.7%. Our work opens new possibilities for large-scale, low-cost, printable perovskite multi-junction solar cells.

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