DEPARTMENT OF APPLIED PHYSICS 123 Representative Publications • Nature Communication 13, 138 (2022) • Matter 5, 4153-4169 (2022) • Nature Reviews Materials 5, 482-500 (2020) • Nature Communication 11, 5483 (2020) • Nature Materials 17, 908-914 (2018) Email kathy-kai.leng@polyu.edu.hk Qualification MSc (Nankai University) PhD (National University of Singapore) ORCID ID: 0000-0003-3408-5033 Dr LENG Kai Assistant Professor Presidential Young Scholar Research Overview Dr Leng's research is in the emergent research field of molecularly thin (monolayer) 2D organic-inorganic hybrid perovskites. Molecularly thin 2D organic-inorganic hybrid perovskite is defined as a new class of 2D material. This emerging field is highly promising. She was the first to obtain 2D hybrid perovskite monolayers across the homologous series and quickly established her niche in the field of molecularly thin 2D hybrid perovskites. Based on these single-crystalline hybrid perovskite monolayers, Dr Leng discovered the unique intrinsic physical property in monolayers which is absent from their bulk counterparts. Then she was the first to fabricate perovskite monolayer photodetector and construct van der Waals heterostructure of 2D perovskite monolayer with graphene for FET. Most importantly, due to the clean and flat surface of thin perovskite, Dr Leng’s team is the first to visualise the surface atomic structure of 2D perovskites by STM & q-plus AFM and verify surface octahedral tilt in 2D Ruddlesden-Popper perovskites across the homologous series. This surface-enhanced octahedral tilt is correlated to optical bandgap and promotes Rashba band spin splitting in 2D perovskites. In summary, Dr Leng’s original science and nanotechnology contributions in molecularly thin 2D organic-inorganic hybrid perovskites from physics to devices have received wide acclaim. Patent • World Patent: WO2018013055A1, 2018-01-18 Awards and Achievements • Prof. Lee Soo Ying Early Career Gold Award – Singapore National Institute of Chemistry (SNIC), 2020 • Chinese Government Award for Outstanding Self-Financed Student Abroad, 2018 Monolayer 2D organic-inorganic hybrid perovskites show enhanced lattice stability and superior electrical/optical properties. The combination of excellent detection capability with the deformable nature of perovskite monolayers can potentially be a rising star among novel flexible materials.
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