Abstract
The physical mechanism of S-shaped kink formation in current–voltage characteristics is experimentally investigated in small molecular organic solar cells with the structure of indium–tin oxide (anode)/copper phthalocyanine (donor)/fullerene (acceptor)/bathocuproine (buffer)/Ag (cathode). It is demonstrated that the S-shaped kink is due to the high resistance to the injection current at the organic/electrode interface. A possible method is proposed for suppressing the S-shaped kink by inserting a set of thin Ag and pentacene layers between the anode electrode and the donor organic layer. In this case, a large hole injection current is generated at the Ag/pentacene interface owing to the tunneling effect under illumination, when the positive external bias voltage is applied to the anode.
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