Probing the structure-property-composition relationship in organic-inorganic tri-halide perovskites

Julia L Payne; Chengsheng Ni; Jonathon R Harwell; Lethy Krishnan Jagadamma; Calum McDonald; Davide Mariotti; Ifor D W Samuel; John T S Irvine

doi:10.1039/c8cp01871e

Probing the structure-property-composition relationship in organic-inorganic tri-halide perovskites

Phys Chem Chem Phys. 2018 Aug 8;20(31):20489-20496. doi: 10.1039/c8cp01871e.

Authors

Julia L Payne¹, Chengsheng Ni, Jonathon R Harwell, Lethy Krishnan Jagadamma, Calum McDonald, Davide Mariotti, Ifor D W Samuel, John T S Irvine

Affiliation

¹ School of Chemistry, University of St Andrews, North Haugh, St Andrews, Fife KY16 9ST, UK. jlp8@st-andrews.ac.uk jtsi@st-andrews.ac.uk.

PMID: 30043774
DOI: 10.1039/c8cp01871e

Abstract

Here, we have synthesised a range of samples, with the formula (CH3NH3)1-2x(H3NC2H4NH3)xPbI3, with different levels of ethylenediammonium substitution to probe non-stoichiometry at the A-site of the perovskite. A single phase region was identified and is accompanied by a change in photophysical properties. The influence of aliovalent substitution with ethylenediammonium results in a decrease in HOMO level from -5.31 eV for x = 0 to -5.88 eV for x = 0.15.