Ambipolar blends of CuPc and C60: charge carrier mobility, electronic structure and its implications for solar cell applications

TL;DR

This study investigates ambipolar charge transport in CuPc and C60 blends, analyzing how mixing ratios affect electronic properties and their implications for solar cell performance.

Contribution

It provides new insights into the relationship between blend composition, electronic structure, and charge mobility in CuPc/C60 systems for photovoltaic applications.

Findings

Charge carrier mobilities depend on the blend ratio.

Electronic levels shift with composition changes.

Implications for optimizing organic solar cells.

Abstract

Ambipolar transport has been realised in blends of the molecular hole conductor Cu-phthalocyanine (CuPc) and the electron conducting fullerene C60. Charge carrier mobilities and the occupied electronic levels have been analyzed as a function of the mixing ratio using field-effect transistor measurements and photoelectron spectroscopy. These results are discussed in the context of photovoltaic cells based on these materials.