Organic Solar Cells: Electrostatic Stabilization of Organic Semiconductor Nanoparticle Dispersions by Electrical Doping

摘要

Organic semiconductor nanoparticle dispersions are electrostatically stabilizedwith the p-doping agent 2,3,5,6-tetrafluoro-7,7,8,8-tetracyanoquinodimethane(F_4TCNQ), omitting the need for surfactants. Smallest amountsof F_4TCNQ stabilize poly(3-hexylthiophene) dispersions and reduce the sizeof the nanoparticles significantly. The concept is then readily transferred tosynthesize dispersions from a choice of light-harvesting benzodithiophenebasedcopolymers. Dispersions from the corresponding polymer:fullereneblends are used to fabricate organic solar cells (OSCs). In contrast to thewidely used stabilizing surfactants, small amounts of F_4TCNQ show nodetrimental effect on the device performance. This concept paves the way forthe eco-friendly fabrication of OSCs from nanoparticle dispersions of highefficiencylight-harvesting semiconductors by eliminating environmentallyhazardous solvents from the deposition process.