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Past Events
Public Seminar of RPg Student:
Studies of New Layered Perovskites for Energy Applications
| Speaker: | Mr. Tik Lun LEUNG |
| Affiliation: | The University of Hong Kong |
| Date: | May 2, 2018 (Wednesday) |
| Time: | 3:30 p.m. |
| Venue: | Rm 522, 5/F, Chong Yuet Ming Physics Building, HKU |
Abstract
Perovskites are crystalline materials with a cubic structure of ABX3 where the A cation is located in cavity formed by eight corner-shared BX6 octahedrons. Properties of long charge diffusion length, direct and tunable band gap have been demonstrated in metal halide perovskites. Therefore, they attract enormous research interests in photovoltaic and optoelectronic applications. However, halide perovskites generally suffer from stability issue which limits their practical applications. Meanwhile, quasi-2D perovskites with general formula of R2An-1BnX3n+1 have the perovskite layers are separated by long aliphatic or aromatic alkylammonium cations. The self-assembled 2D perovskites show enhanced stability. In addition, their properties can be tuned by adjusting n, which effectively changes the width of well layers in a natural quantum well structure consisting of small molecules organic-inorganic halide layer wells and bulky organic molecule barriers. Layered structures can also be oriented perpendicularly to the substrate surface which forms efficient charge transport channels by simple solvent and deposition condition modification. Therefore, these structures can provide opportunities of developing new semi-conductors for various applications (energy conversion, energy saving and energy storage).
Anyone interested is welcome to attend.