Rational design of a triiodide-intercalated dielectric-switching hybrid for visible-light absorption

Intercalation can induce novel optical and electronic properties in many materials. Here, we design the first triiodide-intercalated dielectric-switching hybrid (n-propylammonium)(4)center dot I-3 center dot BiI6, which displays a narrow bandgap of 1.34 eV, comparable to that of CH3NH3PbI3 (1.53 eV). Clearly, its semiconducting properties were solidly demonstrated by a notable carrier mobility efficiency, conductivity and photoconductive behavior.