[J. Mater. Chem. C] Layer-Controlled Two-Dimensional Perovskites: Synthesis and Optoelectronics
Invited review article in the Emerging Investigator 2017 themed issue
Solution-processed hybrid organic-inorganic metal halide perovskites are emerging as one of the most promising candidates for low-cost photovoltaics and optoelectronics. Two-dimensional (2D) forms of these materials induces the dielectric quantum confinement effect that drastically increases the exciton binding energy. Early works on two-dimensional (2D) hybrid perovskites had been focused on the thinnest counterparts, namely, the zero-layer and monolayer species, in which the photoluminescence quantum yield is typically low (<10%), thereby limiting their applications in optoelectronics. Recent advances in colloidal synthesis have suggested that precise control over the layer number can be realized on a large scale, offering another degree of freedom in tailoring the optoelectronic properties. Here, we review the photophysical properties, synthetic routes, and potential technology opportunities of the layer-controlled 2D hybrid perovskites.