Molecular-level concentration‑controlled single dopant turns a p‑type organic polymer semiconductor into its n‑type counterpart in polarity shift

https://www.eurekalert.org/news-releases/1104133

"overcomes n-type organic semiconductors' limited availability/ ambient instability... gold(III) chloride (AuCl₃) dopant ions become oxidized, performing substitutional chlorination: chlorine atom replaces atom or group on polymer backbone, chemically/ structurally altering polymer's structure... reorganizes charge transport pathways... p–n organic homojunction diode using single polymer doped at 2 different concentrations, rectification ratio 10s of 1,000sX greater than single-material diodes... flexible electronics"