Research Projects

Despite numerous achievements in thin-film technologies, the growth of high-quality single crystals of 2D perovskites is still in a challenging state. The single crystals have high charge mobility and low defect concentrations, and therefore they are well suited for optoelectronic applications. The conventional bulk perovskites, particularly thin film, are often unstable and not efficient for the scale-up. In order to overcome these limitations, we present a new low-temperature solution route to grow (MBA)2(FA)n-1(Pb)n(Br)3n+1 single crystals. This approach aims to generate bulk, high-quality single crystals that are scalable, inexpensive, and reproducible, enabling the ability of these materials to be serious contenders for next-generation optoelectronics. The unusual (MBA)2(FA)n-1(Pb)n(Br)3n+1 architecture presents the benefits of higher stability, tunable bandgap, good charge transport properties, and high defect passivation over traditional bulk perovskites. Moreover, the incorporation of chiral organic spacer MBA also makes it possible to respond selectively to circularly polarized light and widen the photonic application range. Here we will study the impact of changes in "n" (i.e., the number of inorganic layers in the perovskites) on the electronic and optical properties, stability, and device performance of these perovskites. This allows us to probe the effect of layer thickness on key properties such as bandgap tunability and charge transport, which is important for improving optoelectronic device functionality by varying "n." Our low-temperature synthesis approach is reproducible and large-scale viable, simplifying and reducing the cost of producing these materials for commercial use. This would constitute a significant step forward in the scale-up and low-cost implementation of perovskite-based devices. Overall, this work may represent a critical scientific and technological milestone, which can propel 2D perovskite superlattices into a new age of practical application. This would both deepen the fundamentals of materials science and empower engineers to design low-cost, multifunctional future devices.