Activity: Talks and presentations › Conference presentations
Metal halide perovskites have emerged to the forefront of light absorber materials, due to their unique physicochemical properties: tunable wavelength, large diffusion length, long carrier lifetime, scalable and cost-efficient production. These characters are, however, morphology and size dependent. Perovskite materials have shown great potential for their applications in solar cells, photodetectors, light-emitting devices, field-effect transistors and lasers. So far, researchers have successfully engineered perovskites in the forms of nanocubes, nanospheres, nanorods, and nanoplatelets with sizes controlled from several to hundreds of nanometers. However, the synthesis of perovskite nanowires with controlled morphology is rarely successful. In addition, recent research has revealed that all-inorganic metal halide perovskites could have much enhanced stability in contrast to organometal halide perovskites. In this work, we explore the new approach to the controlled synthesis of all-inorganic CsPbCl3 nanowires using hot injection method with the pretreatment by Cu2+ ions. The resulting nanowires have a diameter of ca. 20 nm and an average length of 500 nm,showing a red-shifted photoluminescence emission due to quantum confinement effect. With their structures and photoelectrochemical performance systematically studied, a 3.5-fold photocurrent enhancement was enabled by these CsPbCl3 nanowires compared to untreated nanocubes. The results clearly suggest that the synthesized materials are a promising photonic material for fabrication of ultraviolet detection devices. And our newly developed method could be a generally effective way in controlling morphology and opto-electronic properties of all-inorganic halide perovskite nanostructures.