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.