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10 September 2019 New insights into contact resistance at organic semiconductor contacts (Conference Presentation)
Peter Ho
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Proceedings Volume 11097, Organic and Hybrid Field-Effect Transistors XVIII; 1109705 (2019) https://doi.org/10.1117/12.2531838
Event: SPIE Organic Photonics + Electronics, 2019, San Diego, California, United States
Abstract
Achieving ohmic contacts is key to maximizing the performance of the organic semiconductor in field-effect transistors. The same is true also for organic solar cells, and light-emitting diodes. Recently, by tuning the work function of hole collection layers, and electron collection layers, in fine steps across the Fermi-level pinning threshold of the model photoactive layers in solar cells, which are particularly sensitive to charge extraction contact resistance, we obtain direct evidence for a non-ohmic to ohmic transition associated with strong suppression of resistivity at the contact, when the electrode work function crosses a second threshold beyond the onset of Fermi-level pinning. Detailed current balance analysis reveals this transition to be a fundamental feature of charge transfer kinetics, relevant to both injection and collection, at disordered semiconductor interfaces. Similar considerations apply also to field-effect transistor contacts. Using an enhanced transmission-line model, we show that it is possible to separate out contact resistance from carrier mobility effects, including both their current density and carrier density dependences, from measured IV curves, enabling the characterization of the true carrier mobility in field-effect transistors.
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Peter Ho "New insights into contact resistance at organic semiconductor contacts (Conference Presentation)", Proc. SPIE 11097, Organic and Hybrid Field-Effect Transistors XVIII, 1109705 (10 September 2019); https://doi.org/10.1117/12.2531838
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KEYWORDS
Resistance
Organic semiconductors
Transistors
Solar cells
Electrodes
Light emitting diodes
Organic photovoltaics
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