Enhanced open-circuit voltage in subphthalocyanine/C60 organic photovoltaic cells.
A double-heterostructure boron subphthalocyanine chloride (SubPc)/C60 thin-film photovoltaic cell exhibits a more than doubled Voc compared to a conventional copper phthalocyanine (CuPc)/C60 cell under 1 sun AM1.5G simulated illumination. The lower oxidation potential of SubPc results in an increase in the energy difference between the lowest unoccupied molecular orbital of the acceptor-like material and the highest occupied molecular orbital of the donor-like material (referred to as the interface gap, Ig) by 400 meV. We attribute the significant increase in Voc to this increase in Ig.
Mutolo
Kristin L
KL
Department of Chemistry, University of Southern California, Los Angeles, California 90089, USA.
Mayo
Elizabeth I
EI
Rand
Barry P
BP
Forrest
Stephen R
SR
Thompson
Mark E
ME