Publication date: 1st December 2021
Metal halide perovskites possess a large variety of charged and neutral defect states which play important role in performance of perovskite-based devices. Some of the charged defects, such as ions and vacancies are mobile and can drift in electric field. They cause appearance of dynamics processes. The best known is an efficiency hysteresis observed in perovskite solar cells. Despite of numerous investigations, the ion motion properties and their influence on electronic processes in perovskite layers are far from understood.
Here we combined several time-resolved investigation techniques, such as transient absorption, time-resolved luminescence and transient photocurrent to address the ion motion and their role in electronic dynamics. Applied electric field was found to effectively quench the perovskite photoluminescence, however only in case when the field is applied by short pulses simultaneously with short optical excitation pulses; influence of the steady state voltage is much weaker. Moreover, the photoluminescence quenching also strongly depends on the applied voltage between pulses. PL intensity variations induced by abrupt voltage application revealed two characteristic time scales of the ion motion of tens of milliseconds and up to tens of seconds. The ion redistribution changes the electric field strength and its distribution across the layer thickness. Transient electroabsorption and photocurrent investigations supplied information on the electric field dynamics additionally revealing the memory effects influencing the carrier motion and related processes.
This work was partly financed by European Regional Development Fund under grant agreement No 01.2.2-LMT-K-718-03-0048 with the Research Council of Lithuania.
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