Effect of interfacial dipoles on charge traps in organic–inorganic hybrid solar cells

Abstract

We introduce a bias-dependent fluorescence modulation technique to directly probe charge transfer processes at the organic–inorganic interface of working bilayer hybrid solar cells. Large hysteresis in bilayer P3HT–TiO₂ devices indicates the presence of charge traps at the interface, unlike in P3HT-COOH–TiO₂ devices. The results provide insights into enhancing interfacial interactions between organic and inorganic materials using modifiers such as –COOH, for the rational design of efficient hybrid solar cells.