基於二維與準二維鈣鈦礦原子級薄片之光電磁特性與光電自旋元件(2/2)

For the well-known two-dimensional materials, because of the confined charge and heat transport in the two-dimensional structures, the properties of these materials deviate significantly from those of the bulk form. So far, twodimensional materials have generated considerable research efforts and revolutionized electronics. In the past ten years, organic-inorganic hybrid halide perovskites have already achieved great success in solar cells, light-emitting diodes, lasers, and photodetetors. In addition to the high absorption coefficient, high carrier diffusion length, high carrier mobility and tunable bandgap, it was observed recently that halide perovskites exhibit Rashba-splitting, optical spin selection rules, long spin diffusion length and spin lifetime, and magnetic field response. These new findings have led researchers to believe that perovskite materials might be used in spintronics and valleytronics. However, most of the above-mentioned properties were observed based on thick polycrystalline halide perovskites. Only few researchers focused on atomically thin two-dimensional organic-inorganic hybrid perovskites. Our team believe that doing research works on atomically thin two-dimensional organic-inorganic hybrid perovskites might uncover more properties of these materials and facilitate relevant applications. We have already demonstrated that the new fabrication procedure developed by our group can deliver atomically thin two-dimensional organic-inorganic hybrid perovskite flakes within two minutes. Based on preliminary results, there are three objectives in this project: 1. Using the fabrication procedure we developed and the chemical vapor deposition method to prepare two-dimensional and quasitwo-dimensional organic-inorganic hybrid perovskite flakes. Our team will try our best to control the thickness of the three-dimensional halide perovskites and then value of the Ruddlesden-Popper perovskite flakes. Chiral molecules will also be used to realize perovskite materials with circularly polarized emission. 2. Using FTIR, ellipsometer, micro-Raman, steady-state and transient PL, Kerr microscope, circular dichroism spectroscope, and circularly polarized luminescence spectroscope, current-voltage and impedance spectroscopy to investigate the hybrid perovskite flakes. The influence of the magnetic field will also be investigated. 3. Our team will try to develop transistors, photodetectors and spin-optoelectronic devices based on two-dimensional organic-inorganic hybrid perovskite flakes. Magnetic materials will be used in certain devices. Because there are only a few works on the hybrid perovskite flakes, our team believe that we can take the lead in this field and make achievements if this proposal could be supported.