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Enhanced open-circuit voltage in subphthalocyanine/C60 organic photovoltaic cells
Kristin L Mutolo1, Elizabeth I Mayo, Barry P Rand
1Department of Chemistry, University of Southern California, Los Angeles, California 90089, USA.
Abstract:
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.
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