Structural and Optoelectronic Properties of 2D Multilayered Perovskites
Résumé
2D multilayered perovskites share similarities with 3D perovskites including direct electronic band gaps, strong spin-orbit coupling, sizeable optical absorptions, small effective masses, Rashba-like effects. Interestingly, they exhibit other attractive features related to tunable quantum and dielectric confinements, strong lattice anisotropy, more complex combinations of atomic orbitals and lattice dynamics, extensive chemical engineering possibilities. This will be illustrated by recent combined experimental and theoretical studies on excitons, formation of edge states, hot carrier effects and carrier localization. More, combined in 2D/3D bilayer structures using new versatile growth methods, excellent solar cell device stability can be achieved. Band alignment calculations nicely explain the difference of performances for ni-p or p-i-n devices. The lattice mismatch concept can provide guidance for the choice of the proper 2D/3D combination.