"Halide perovskites have emerged as promising semiconductors for optoelectronic applications owing to their high charge-carrier mobility, long diffusion lengths and facile solution processability. These properties have enabled rapid advancements in perovskite-based photovoltaics, light-emitting diodes (LEDs), photodetectors and lasers."
"Although substantial progress has been made in photovoltaic stability, hybrid perovskite LEDs remain prone to rapid operational degradation compared to conventional inorganic semiconductors, such as silicon and III-V materials. Electric-field-driven ion migration and interfacial electrochemical reactions at interfaces are widely recognized as critical challenges."
"The advent of high-speed detectors has enabled time-resolved in situ electron microscopy, allowing precise stimulus control with outstanding spatial, temporal and spectral resolution. Early in situ transmission electron microscopy (TEM) studies on perovskite photovoltaics established the importance of field-driven transformations under bias: iodide migration and PbI2 nucleation with polarity dependence."
Halide perovskites are promising semiconductors for optoelectronic applications due to their high charge-carrier mobility, long diffusion lengths, and solution processability, enabling advances in photovoltaics, LEDs, photodetectors, and lasers. However, hybrid perovskite LEDs degrade rapidly during operation compared to conventional semiconductors. Electric-field-driven ion migration and interfacial electrochemical reactions are recognized as critical degradation factors, yet atomic-scale mechanisms remain poorly understood. Conventional techniques like synchrotron X-ray spectroscopy lack spatial resolution for localized degradation phenomena. Time-resolved in situ electron microscopy with high-speed detectors offers outstanding spatial, temporal, and spectral resolution. Previous TEM studies on perovskite photovoltaics revealed field-driven transformations including iodide migration, PbI2 nucleation, oxygen exchange, and amorphization-recrystallization dynamics, though typically under static biasing focused on bulk layers.
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