A Pulse-Biasing Small-Signal Measurement Technique Enabling 40 MHz Operation of Vertical Organic Transistors

Scientific Reports
Bahman Kheradmand-BoroujeniFrank Ellinger

Abstract

Organic/polymer transistors can enable the fabrication of large-area flexible circuits. However, these devices are inherently temperature sensitive due to the strong temperature dependence of charge carrier mobility, suffer from low thermal conductivity of plastic substrates, and are slow due to the low mobility and long channel length (L). Here we report a new, advanced characterization circuit that within around ten microseconds simultaneously applies an accurate large-signal pulse bias and a small-signal sinusoidal excitation to the transistor and measures many high-frequency parameters. This significantly reduces the self-heating and therefore provides data at a known junction temperature more accurate for fitting model parameters to the results, enables small-signal characterization over >10 times wider bias I-V range, with ~105 times less bias-stress effects. Fully thermally-evaporated vertical permeable-base transistors with physical L = 200 nm fabricated using C60 fullerene semiconductor are characterized. Intrinsic gain up to 35 dB, and record transit frequency (unity current-gain cutoff frequency, fT) of 40 MHz at 8.6 V are achieved. Interestingly, no saturation in fT - I and transconductance (gm - I) is observed at h...Continue Reading

References

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Citations

Jul 17, 2020·Science Advances·James W BorchertHagen Klauk
Sep 20, 2020·Nature Communications·Erjuan GuoHans Kleemann
Jun 30, 2018·Scientific Reports·Markus P KlingerKarl Leo
Sep 17, 2020·Science Advances·James W BorchertHagen Klauk
Mar 23, 2021·Advanced Science·Michael F SawatzkiKarl Leo
Jun 23, 2020·Chemistry of Materials : a Publication of the American Chemical Society·Mihai Irimia-VladuNiyazi Serdar Sariciftci
Jul 2, 2019·The Journal of Physical Chemistry Letters·Xuelin FanAlexander Eychmüller
Oct 9, 2021·Advanced Materials·James W BorchertHagen Klauk

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