Organic complementary oscillators with stage-delays below 1 μs

Abstract

Recently, complex circuits of organic thin-film transistors have been shown. The use of complementary logic can significantly ease the design of large integrated circuits. However, the performance of complementary logic in organic thin-film technology has not been able to equivale that of unipolar logic, due to the difficulty to densely integrate and simultaneously optimize p-type and n-type transistors on a single substrate. Here, we develop an optimized complementary process for C60 n-type and pentacene p-type transistors, both having bottom-gate bottom-contact geometry. Using this complementary technology, we show ring-oscillators with a stage-delay below 1 μs at a supply-voltage of 20 V.

Fast ambipolar integrated circuits with poly(diketopyrrolopyrrole- terthiophene)

“…CMOS-like ring oscillators operating at frequencies up to 42 kHz are demonstrated. These are the fastest organic CMOS-like circuits reported to date and approach the speeds obtained in state-of-the-art organic CMOS 12 and organic unipolar 13,14 circuits. This makes DPPcopolymers viable candidates to act as the semiconductor in high performance organic logic.…”

Organic complementary inverter and ring oscillator on a flexible substrate

“…Figure 4(d). This value is not higher than the previously reported one [7][8][9], but it was obtained from devices that were fabricated via photolithography. Although the f OSC value obtained in this work is slightly lower than the previous values obtained, it is noticeable that a high frequency of 10 kHz was achieved when thermal evaporation was performed on the flexible substrate using commercial organic semiconductors.…”

“…This notwithstanding, complementary circuits made of both n-and p-type transistors have many advantages, such as low power consumption, high noise margin, and robustness. As such, since the release of the initial results of Bell Labs [6], several groups have studied and have reported the results of their researches on complementary OFET circuits [7][8][9]. In these studies, the photolithography process was used to deposit electrodes.…”

Electronics on plastic foil, for applications in flexible OLED displays, sensor arrays and circuits

“…Large circuits therefore command the use of complementary transistors. In the state of the art, combinations of n-type and p-type TFTs into sizeable circuits on plastic foil have been shown, using organic TFTs for the p-types and either organic [20] or oxide [21] TFTs for the n-types. For the latter, in particular also metal-oxide…”