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Bandgap tunability of lead mixed halide perovskites (LMHPs) is a crucial characteristic for versatile optoelectronic applications. Nevertheless, LMHPs show the formation of iodide‐rich (I‐rich) phase under illumination, which destabilizes the semiconductor bandgap and impedes their exploitation. Here, it is shown that how I2, photogenerated upon charge carrier trapping at iodine interstitials in LMHPs,...
Transfer of electrons through semiconductor heterojunctions is the key process in all electronics. Here we make movies of electron dynamics in InSe/GaAs through time and spectrally-resolved photoemission electron microscopy, bringing insights to this fundamental process.
Complex electron flow within a photoexcitation spot is observed on homogeneous GaAs surface by bringing spatial resolution into traditional ultrafast pump probe technique via time-resolved photoemission electron microscopy.
We show that time-resolved photoemission spectroscopy enables investigation of electron dynamics in materials with space, time, momentum and energy resolution. With this capability we track the evolution of photoexcited carriers in p-doped gallium arsenide.
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