The Experts below are selected from a list of 20052 Experts worldwide ranked by ideXlab platform
Karl Leo - One of the best experts on this subject based on the ideXlab platform.
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operation mechanism of high performance organic permeable Base transistors with an insulated and perforated Base Electrode
Journal of Applied Physics, 2016Co-Authors: Felix Kaschura, Axel Fischer, Markus P Klinger, Duy Hai Doan, Thomas Koprucki, Annegret Glitzky, Daniel Kasemann, Johannes Widmer, Karl LeoAbstract: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 cu...
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controlling morphology a vertical organic transistor with a self structured permeable Base using the bottom Electrode as seed layer
Applied Physics Letters, 2015Co-Authors: Felix Kaschura, Axel Fischer, Daniel Kasemann, Karl Leo, Björn LüssemAbstract:Flexible organic permeable Base transistors are a promising transistor technology, enabling high transconductance without the need for cost-intensive structuring techniques. Here, we present a simple approach to enhance the transmission and thus the current gain of a permeable Base transistor. By adding a morphology modifying gold layer beneath the organic semiconductor, the interface to the Base Electrode is adjusted, resulting in a self-structured permeable Base. Furthermore, we show that doping is essential not only for charge injection at the emitter, but is also required at the collector for a good performance. We show that the transmission can be increased to 98% by tuning the built-in field at the collector to actively gather charge carriers. The built-in field also leads to a very low minimum operation voltage <0.5 V, resulting in a low power consumption.
Felix Kaschura - One of the best experts on this subject based on the ideXlab platform.
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operation mechanism of high performance organic permeable Base transistors with an insulated and perforated Base Electrode
Journal of Applied Physics, 2016Co-Authors: Felix Kaschura, Axel Fischer, Markus P Klinger, Duy Hai Doan, Thomas Koprucki, Annegret Glitzky, Daniel Kasemann, Johannes Widmer, Karl LeoAbstract: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 cu...
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controlling morphology a vertical organic transistor with a self structured permeable Base using the bottom Electrode as seed layer
Applied Physics Letters, 2015Co-Authors: Felix Kaschura, Axel Fischer, Daniel Kasemann, Karl Leo, Björn LüssemAbstract:Flexible organic permeable Base transistors are a promising transistor technology, enabling high transconductance without the need for cost-intensive structuring techniques. Here, we present a simple approach to enhance the transmission and thus the current gain of a permeable Base transistor. By adding a morphology modifying gold layer beneath the organic semiconductor, the interface to the Base Electrode is adjusted, resulting in a self-structured permeable Base. Furthermore, we show that doping is essential not only for charge injection at the emitter, but is also required at the collector for a good performance. We show that the transmission can be increased to 98% by tuning the built-in field at the collector to actively gather charge carriers. The built-in field also leads to a very low minimum operation voltage <0.5 V, resulting in a low power consumption.
Björn Lüssem - One of the best experts on this subject based on the ideXlab platform.
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Suppressing Base Currents in Organic Permeable-Base Transistors by Anodization of the Base Electrode
ACS Applied Electronic Materials, 2019Co-Authors: Raj Kishen Radha Krishnan, Akram Al-shadeedi, Björn LüssemAbstract:Organic permeable Base transistors (OPBTs) have long been investigated as an alternative to conventional OFETs. Their vertical architecture allows for simple low-resolution fabrication techniques, leading to short channel lengths and high current densities. However, to achieve a higher amplification in these transistors, it is essential to keep the Base current a few orders of magnitude lower than the collector current. Here, it is shown that electrochemically growing a thin oxide layer on top of the Base Electrode of OPBT in conjunction with a self-assembled monolayer (SAMs) is capable of suppressing the Base current and obtaining a higher amplification value.
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controlling morphology a vertical organic transistor with a self structured permeable Base using the bottom Electrode as seed layer
Applied Physics Letters, 2015Co-Authors: Felix Kaschura, Axel Fischer, Daniel Kasemann, Karl Leo, Björn LüssemAbstract:Flexible organic permeable Base transistors are a promising transistor technology, enabling high transconductance without the need for cost-intensive structuring techniques. Here, we present a simple approach to enhance the transmission and thus the current gain of a permeable Base transistor. By adding a morphology modifying gold layer beneath the organic semiconductor, the interface to the Base Electrode is adjusted, resulting in a self-structured permeable Base. Furthermore, we show that doping is essential not only for charge injection at the emitter, but is also required at the collector for a good performance. We show that the transmission can be increased to 98% by tuning the built-in field at the collector to actively gather charge carriers. The built-in field also leads to a very low minimum operation voltage <0.5 V, resulting in a low power consumption.
Daniel Kasemann - One of the best experts on this subject based on the ideXlab platform.
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operation mechanism of high performance organic permeable Base transistors with an insulated and perforated Base Electrode
Journal of Applied Physics, 2016Co-Authors: Felix Kaschura, Axel Fischer, Markus P Klinger, Duy Hai Doan, Thomas Koprucki, Annegret Glitzky, Daniel Kasemann, Johannes Widmer, Karl LeoAbstract: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 cu...
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controlling morphology a vertical organic transistor with a self structured permeable Base using the bottom Electrode as seed layer
Applied Physics Letters, 2015Co-Authors: Felix Kaschura, Axel Fischer, Daniel Kasemann, Karl Leo, Björn LüssemAbstract:Flexible organic permeable Base transistors are a promising transistor technology, enabling high transconductance without the need for cost-intensive structuring techniques. Here, we present a simple approach to enhance the transmission and thus the current gain of a permeable Base transistor. By adding a morphology modifying gold layer beneath the organic semiconductor, the interface to the Base Electrode is adjusted, resulting in a self-structured permeable Base. Furthermore, we show that doping is essential not only for charge injection at the emitter, but is also required at the collector for a good performance. We show that the transmission can be increased to 98% by tuning the built-in field at the collector to actively gather charge carriers. The built-in field also leads to a very low minimum operation voltage <0.5 V, resulting in a low power consumption.
Axel Fischer - One of the best experts on this subject based on the ideXlab platform.
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operation mechanism of high performance organic permeable Base transistors with an insulated and perforated Base Electrode
Journal of Applied Physics, 2016Co-Authors: Felix Kaschura, Axel Fischer, Markus P Klinger, Duy Hai Doan, Thomas Koprucki, Annegret Glitzky, Daniel Kasemann, Johannes Widmer, Karl LeoAbstract: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 cu...
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controlling morphology a vertical organic transistor with a self structured permeable Base using the bottom Electrode as seed layer
Applied Physics Letters, 2015Co-Authors: Felix Kaschura, Axel Fischer, Daniel Kasemann, Karl Leo, Björn LüssemAbstract:Flexible organic permeable Base transistors are a promising transistor technology, enabling high transconductance without the need for cost-intensive structuring techniques. Here, we present a simple approach to enhance the transmission and thus the current gain of a permeable Base transistor. By adding a morphology modifying gold layer beneath the organic semiconductor, the interface to the Base Electrode is adjusted, resulting in a self-structured permeable Base. Furthermore, we show that doping is essential not only for charge injection at the emitter, but is also required at the collector for a good performance. We show that the transmission can be increased to 98% by tuning the built-in field at the collector to actively gather charge carriers. The built-in field also leads to a very low minimum operation voltage <0.5 V, resulting in a low power consumption.