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• W2046712429 abstract "Hybrid organic-on-inorganic structures may represent an interesting alternative to all-inorganic and all-organic photovoltaic devices, allowing association of the stability and conversion efficiency of n-type inorganic semiconductors with the tunability of band level energies of organic p-type semiconductors. Efficient heterojunctions can be realized by this approach, as demonstrated by the example described: n-type GaAs associated with an organic p-type polythiophene derivative. A thin film (25 nm) of polythiophene has been electrochemically grown onto an n-GaAs substrate, and the cell has been completed by a thin layer of Au providing a front ohmic contact to the polymer layer. This device has been illuminated under a polychromatic 100 mW cm−2 tungsten lamp, through the Au layer. The photovoltaic characteristics of this hybrid cell have been directly compared to those of a classical Schottky junction, n-GaAs/Au. Photocurrent action spectra confirm that the light is principally absorbed in the n-GaAs. The power characteristics of these cells show an increase of the conversion efficiency on passing from the Schottky cell (14%) to the hybrid cell (17.5%), which is due to the large increase of the open-circuit voltage. The parameters of the junction have been analysed by dark-current–voltage measurements, and interpreted following Anderson's model, which allows an energy band diagram to be proposed for this heterojunction. The improvement of Voc is attributed to the creation of a high built-in potential of 0.93 eV, together with the reduction of the dark direct current." @default.
• W2046712429 created "2016-06-24" @default.
• W2046712429 creator A5010853868 @default.
• W2046712429 date "2002-10-30" @default.
• W2046712429 modified "2023-10-16" @default.
• W2046712429 title "Hybrid organic-on-inorganic photovoltaic devices" @default.
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• W2046712429 doi "https://doi.org/10.1088/1464-4258/4/6/361" @default.
• W2046712429 hasPublicationYear "2002" @default.
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