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The University of Hong Kong

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This research uncovered the basic relationship between crystal distortion and light emission properties of two-dimensional (2D) hybrid perovskites. Firstly, octahedral distortion lowers the formation energy of iodine vacancies which can act as nonradiative recombination centres, thereby reducing photoluminescence efficiency. Secondly, the local symmetry breaking caused by such distortion also affects the electronic band structure. In particular, it was revealed that DJ-phase crystals based on the organic cation 4-(aminomethyl) pyridinium (4AMP) exhibit the most pronounced octahedral distortion, resulting in structural inversion asymmetry and significant Rashba band splitting at room temperature.

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The University of Hong Kong

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