Despite the rapid improvement in the performance of various perovskite optoelectronic devices with vertical charge transport, the impact of ion migration remains an Achilles' heel that limits the long-term operational stability of lead halide perovskite devices. Samuel D. Stranks of the University of Cambridge , Petra J. Cameron of the University of Bath , M. Saiful Islam of the University of Oxford and others conducted scan rate-dependent current - voltage measurements on Pb and hybrid Pb - Sn perovskite solar cells to show that in At lower scan rates, short-circuit current losses are present in both perovskites, which can be traced to the presence of mobile ions.
To understand the kinetics of ion migration, the authors performed scan rate-dependent hysteresis analysis and temperature-dependent impedance spectroscopy measurements, which revealed that ion migration in Pb – Sn devices is suppressed compared to pure Pb analogues. .
By linking these experimental observations with first-principles calculations of Pb – Sn hybrid perovskites, the authors reveal the critical role played by Sn vacancies in increasing the iodide ion migration barrier due to local structural distortion.
Krishanu Dey et.al Substitution of lead with tin suppresses ionic transport in halide perovskite optoelectronics EES 2023
DOI: 10.1039/D3EE03772J
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