Elimination of Interface Energy Barriers Using Dendrimer Polyelectrolytes with Fractal Geometry.

ABSTRACT: In this work we study conjugated polyelectrolyte (CPE) films based on polyamidoamine (PAMAM) dendrimers of generations G1 and G3. These fractal macromolecules are compared to branched polyethylenimine (b-PEI) polymer using methanol as the solvent. All of these materials present a high density of amino groups, which protonated by methoxide counter-anions create strong dipolar interfaces. The vacuum level shift associated to these films on n-type silicon was 0.93 eV for b-PEI, 0.72 eV for PAMAM G1 and 1.07 eV for PAMAM G3. These surface potentials were enough to overcome Fermi level pinning, which is a typical limitation of aluminium contacts on n-type silicon. A specific contact resistance as low as 20 mΩ·cm² was achieved with PAMAM G3, in agreement with the higher surface potent

SUBMITTER: Ros E 

PROVIDER: S-EPMC10802975 | biostudies-literature | 2023 Jun

REPOSITORIES: biostudies-literature