Electronic Trends in Oligothiophene Based Layered Lead Halide Perovskites*

We investigate and analyze electronic trends in aminoethyl-oligothiophene (AEnT, n=1-5) based lead halide (PbX$_4$, X=Cl, Br, I) layered perovskites using hybrid density functional theory including spin orbit coupling. Analysis in terms of band edges (PRL 121, 146401 (2018)) demonstrates that one can understand these materials as quantum wells of four different subtypes (called type Ia, type Ib, type IIa, type IIb), depending on whether the organic or the inorganic component contributes the frontier orbitals. We provide a detailed analysis of the electronic properties of the full group in terms of frontier orbitals, densities of states, band curvatures and other key electronic characteristics of interest for the selection of semiconductor materials.