Effect of chirality on the optical properties of layered hybrid perovskite R - and S -α-methylbenzylammonium lead iodide.

The introduction of chirality in layered hybrid perovskites breaks the symmetry of their inorganic sub-lattices. Consequently, they show intriguing linear and non-linear optical properties. Here we explore the effect of chirality on the excitonic photoluminescence of chiral ( R - and S -α-MBA) 2 PbI 4 (MBA: methylbenzylammonium) at cryogenic temperatures. The induced chirality splits the excitonic emissions below 150 K. Additionally, ( R - and S -α-MBA) 2 PbI 4 show wavelength-tunable second harmonic generation (SHG) that depends strongly on the polarization angle of the incident light.