Metallophthalocyanines (MPcs) have been studied extensively with respect to their role in small molecule-based organic photovoltaic devices (OPVs). Having reasonable hole mobilities, excellent chemically stabilities and high linear absorption coefficients across a large portion of the solar irradiance spectrum (~105 cm-1), these macroheterocycles make near ideal candidates for light harvesting layers in solar energy conversion. Although phthalocyanine complexes are known for nearly every metal in the periodic table, the phthalocyanines of copper and zinc are far and away the most commonly used p-type materials in small molecule OPV applications. It is clear that further investigation into the operational parameters of MPc-based OPVs is required. The present work will focus on OPVs fabricated using the phthalocyanine complexes of the groups 10 and 11 metals (Ni, Pd, Pt, Cu and Ag). By choosing phthalocyanine complexes of metals of a given column in the periodic table, we have a well defined subset of metal complexes that are chemically very similar (similar ground state electronic configurations), save the relative energetics of the metal d-orbitals and the frontier orbitals of the phthalocyanine ligand. A discussion of the excited state dynamics, carrier mobilities and frontier molecular orbital energetics of the groups 10 and 11 MPcs and how they correlate with the observed trends in the OPV device characteristics will be presented.
Host: Eric Garfunkel and Alan Wan