Photovoltaic Effect at the Schottky Interface with Organic Single Crystal Rubrene
- Photovoltaic Effect at the Schottky Interface with Organic Single Crystal Rubrene
- Supravat Karak; 임정아; Sunzida Ferdous; Volodimyr V. Duzhko; Alejandro L. Briseno
- organic photovoltaic; single crystal
- Issue Date
- Advanced functional materials
- VOL 24, NO 8, 1039-1046
- Rubrene single crystals can serve as a model material platform for studying
the intrinsic photophysical processes in organic semiconductors and advance
our understanding of material functionality in organic photovoltaic applications.
The high degrees of structural order and material purity of organic
single crystals enable a level of study that is unattainable in materials of current
practical importance. Here, the photovoltaic effect at the Schottky interface
of rubrene single crystal–aluminum electrode is demonstrated in a lateral
ITO–rubrene–Al device geometry. The mechanism of the effect formation
is explained based on the reconstructed energy band diagram of the ITO–
rubrene–Al heterostructure. In particular, the open circuit voltage ( V OC ) of
the devices shows a strong dependency on the interfacial band bending and
corresponding built-in potential at the rubrene–Al Schottky interface. Initially,
the photovoltage is found to be equal to the built-in potential at the Schottky
interface defi ned by the work function difference between the bulk of rubrene
and the Al electrode, that is, following the Schottky–Mott model.
A good agreement is found between the systematically varied built-in
potential and the resulting photovoltage magnitude upon insertion of an
ultrathin LiF interlayer between the rubrene and Al electrode.
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