Ionic transport in hybrid lead iodide perovskite solar cells
By C. Eames, Jarvist Moore Frost, Piers R. F. Barnes, B. O'Regan, Aron Walsh, M. Islam. Nature Communications, 2015
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Solar cells based on organic–inorganic halide perovskites have recently shown rapidly rising power conversion efficiencies, but exhibit unusual behaviour such as current–voltage hysteresis and a low-frequency giant dielectric response. Ionic transport has been suggested to be an important factor contributing to these effects; however, the chemical origin of this transport and the mobile species are unclear. Here, the activation energies for ionic migration in methylammonium lead iodide (CH3NH3PbI3) are derived from first principles, and are compared with kinetic data extracted from the current–voltage response of a perovskite-based solar cell. We identify the microscopic transport mechanisms, and find facile vacancy-assisted migration of iodide ions with an activation energy of 0.6 eV, in good agreement with the kinetic measurements. The results of this combined computational and experimental study suggest that hybrid halide perovskites are mixed ionic–electronic conductors, a finding that has major implications for solar cell device architectures. Understanding the mechanism of ionic transport in organic–inorganic halide perovskites is crucial for the design of future solar cells. Here, Eames et al.undertake a combined experimental and computational study to elucidate the ion conducting species and help rationalize the unusual behaviour observed in these perovskite-based devices.
Subfields: Electrical and Electronic Engineering, Materials Chemistry
View Paper: https://www.semanticscholar.org/paper/c0c037a693c70456c550c96d71f78e6e3b6808fa
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Citations in the corpus
- Efficient Perovskite Solar Cell Modules with High Stability Enabled by Iodide Diffusion Barriers (2019, background): “The major instability issue is attributed to the intrinsically weak bonding of halide perovskite materials where iodide represents the most volatile constituents with the diffusion coefficient as high as 10 12 cm(2) s (1), leading to a significant decomposition of perovskite structure and a fast dec”