Operation mechanism of high performance organic permeable base transistors with an insulated and perforated base electrode

Abstract

The organic permeable base transistor is a vertical transistor architecture that enables high performance while maintaining a simple low-resolution fabrication. It has been argued that the charge transport through the nano-sized openings of the central base electrode limits the performance. Here, we demonstrate by using 3D drift-diffusion simulations that this is not the case in the relevant operation range. At low current densities, the applied base potential controls the number of charges that can pass through an opening and the opening is the current limiting factor. However, at higher current densities, charges accumulate within the openings and in front of the base insulation, allowing for an efficient lateral transport of charges towards the next opening. The on-state in the current-voltage characteristics reaches the maximum possible current given by space charge limited current transport through the intrinsic semiconductor layers. Thus, even a small effective area of the openings can drive huge current densities, and further device optimization has to focus on reducing the intrinsic layer thickness to a minimum.

Description
Keywords
Current density, Current voltage characteristics, Electrodes, Drift-diffusion simulation, Intrinsic layer thickness, Intrinsic semiconductors, Low current density, Operation mechanism, Permeable base transistors, Space charge limited currents, Vertical transistors, Transistors
Citation
Kaschura, F., Fischer, A., Klinger, M. P., Doan, D. H., Koprucki, T., Glitzky, A., et al. (2016). Operation mechanism of high performance organic permeable base transistors with an insulated and perforated base electrode. 120(9). https://doi.org//10.1063/1.4962009
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License
CC BY 4.0 Unported