Minimizing the Trade-Off between Photocurrent and Photovoltage in Triple-Cation Mixed-Halide Perovskite Solar Cells — Thomas Baumeler (2020) | RDL Network
Minimizing the Trade-Off between Photocurrent and Photovoltage in Triple-Cation Mixed-Halide Perovskite Solar Cells
Article 2020 en
Authors
TB
Thomas Baumeler
NA
Neha Arora
AH
Alexander Hinderhofer
Abstract
1 min read
Its lower bandgap makes formamidinium lead iodide (FAPbI<sub>3</sub>) a more suitable candidate for single-junction solar cells than pure methylammonium lead iodide (MAPbI<sub>3</sub>). However, its structural and thermodynamic stability is improved by introducing a significant amount of MA and bromide, both of which increase the bandgap and amplify trade-off between the photocurrent and photovoltage. Here, we simultaneously stabilized FAPbI<sub>3</sub> into a cubic lattice and minimized the formation of photoinactive phases such as hexagonal FAPbI<sub>3</sub> and PbI<sub>2</sub> by introducing 5% MAPbBr<sub>3</sub>, as revealed by synchrotron X-ray scattering. We were able to stabilize the composition (FA<sub>0.95</sub>MA<sub>0.05</sub>Cs<sub>0.05</sub>)Pb(I<sub>0.95</sub>Br<sub>0.05</sub>)<sub>3</sub>, which exhibits a minimal trade-off between the photocurrent and photovoltage. This material shows low energetic disorder and improved charge-carrier dynamics as revealed by photothermal deflection spectroscopy (PDS) and transient absorption spectroscopy (TAS), respectively. This allowed the fabrication of operationally stable perovskite solar cells yielding reproducible efficiencies approaching 22%.
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