Ruddlesden–Popper two‐dimensional chiral perovskite based solar cells

In this work we demonstrate two dimensional (2D) chiral perovskite, where the barrier molecules are the two enantiomers (R)-(+)-α-Methylbenzylamine (R-MBA) and, (S)-(-)-α-Methylbenzylamine (S-MBA). The chirality is manifested at high χ values and pure 2D structure measured by circular dichroism (CD) (where the perovskite general formula is ABX3 ·χ (S/R-MBA)2PbI4, χ is the ratio of the barrier molecule to the small cation (A+)). The anisotropy factor (gabs) decreased by an order of magnitude when decreasing the χ value achieving 0.0062 for pure 2D. Ab initio many-body perturbation theory successfully describes the band gaps, absorbance and CD measurements. For the first time these quasi 2D chiral perovskites were integrated into the solar cell. Using circular polarization (CP) and cut off filter we were able to distinguish the chirality effect from the solar cells photovoltaic response. It was revealed that at high χ values the chirality affected the current density of the solar cell more than at low χ values while the open circuit voltage didn’t change. These chiral 2D perovskite are new class of materials which open the way for polarized hybrid perovskite. This article is protected by copyright. All rights reserved.