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- W2066623218 abstract "We investigated the photovoltaic properties of organic multilayered photovoltaic devices consisting of Indium–tin-oxide (ITO)/oxide/tetraphenyl porphyrin (H 2 TPP, ZnTPP)/fullerene (C 60 )/bathocuproine (BCP)/Al structures. The open-circuit voltage V OC increases with the thickness of porphyrin layers between 10 and 30 nm. The upper limit of V OC is attributed to the built-in potential and the energy difference between the highest occupied molecular orbital (HOMO) of H 2 TPP and the lowest unoccupied molecular orbital (LUMO) of the C 60 layer Δ E . The use of oxide hole collection layers, such as NiO and MoO 3 , is effective for increasing the built-in potential across the organic layers resulting in the improved V OC . The “kink” in the J – V curve observed at approximately V OC for the device with a thick H 2 TPP layer and the device with and without a MoO x layer is analyzed on the basis of the Poole–Frenkel and Schottky models assuming the amorphous porphyrin layers as dielectrics. The resistance of the organic layers is dominated by the field-dependent bulk resistance of H 2 TPP films for V < V OC , whereas the kink above V OC was attributed to the relatively high Schottky barrier for holes at the ITO/H 2 TPP and ITO/MoO 3 interfaces." @default.
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- W2066623218 date "2011-01-01" @default.
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- W2066623218 title "Enhancement of the Open-Circuit Voltage and Hole Conduction of Tetraphenyl Porphyrin/C<sub>60</sub> Multilayered Photovoltaic Device by the Insertion of Oxide Hole Collection Layers" @default.
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- W2066623218 doi "https://doi.org/10.1143/jjap.50.01bc14" @default.
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