Berlin 2018 – scientific programme
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HL: Fachverband Halbleiterphysik
HL 13: Poster Session I
HL 13.56: Poster
Monday, March 12, 2018, 17:30–19:30, Poster B
Optimization of the Base Electrode in Organic Permeable Base Transistors — •Yang Li, Felix Dollinger, Markus P. Klinger, Axel Fischer, Hans Kleemann, and Karl Leo — Dresden Integrated Center for Applied Physics and Photonic Materials(IAPP), Dresden, Germany
Flexible electronics are a hot topic in the field of electronics. Organic semiconductors represent one way to realize flexible transistors. Organic permeable base transistors (OPBT) are a special thin-film transistor architecture having an extremely short channel length, down to 100 nanometers, achieved by a vertical geometry. OPBT devices consist of a base electrode permeable for electrons. With an applied voltage, the base can either block or transmit the electrons traveling from the emitting electrode. The short channel length allows for a current density above 10 A/cm2 at a relatively low voltage (1 V). This device can also achieve an on/off ratio as high as 106. These devices are suited for applications in the high-frequency regime above 10 MHz.
The state-of-the-art fabrication process of these devices had been published previously, but still, the reproducibility needs to be improved. The crucial part is the thin oxide layer around the base electrode. The oxide layer is fabricated by directly oxidizing the base aluminum electrode. We studied the performance of the devices under different oxidants. The result shows that the performance of the transistor is highly related to the quality of the oxide layer around the base. The detailed influence of different oxidants and annealing temperatures will be shown on the poster.