Architecture and surface morphology of organic-inorganic hybrid compounds

Abstract

Thin films of lead iodide based perovskites [p-F(C 6 H 5 )C 2 H 4 NH 3 ] 2 (CH 3 NH 3 ) m-1 Pb m I 3m+1 (m=1, 2) with different inorganic well thickness using p-fluorophenethylammonium as an organic cation were systematically prepared, and the structure and optical properties were investigated. X-ray diffraction patterns demonstrated that the spin-coated film was highly oriented with the c-axis perpendicular to the substrate surfaces and that the control of the inorganic layer thickness in layered perovskites can be achieved by changing the ratio of the two organic amines and lead iodide. When the feed ratio of p-fluorophenethylammonium salt, methylammonium salt, and lead iodide was 2:3.5:3, the bilayer structure was formed. Using p-fluorophenethylammonium instead of alkylammonium as an organic cation, the spin-coated film with high crystallinity was obtained.