Pentacene organic transistors and ring oscillators on glass and on flexible polymeric substrates

Abstract

We have fabricated organic thin film transistors, inverters, and ring oscillators on glass and on flexible polyethylene naphthalate, using the small-molecule hydrocarbon pentacene as the semiconductor and solution-processed polyvinylphenol as the gate dielectric. Depending on the choice of substrate, the transistors have a carrier mobility between 0.3 and 0.7 cm2/V s, an on/off current ratio between 105 and 106, and a subthreshold swing between 0.9 and 1.6 V/decade. To account for the positive switch-on voltage of the transistors, circuits were designed to operate with integrated level shifting. Depending on the type of substrate, ring oscillators have a signal propagation delay as low as 15 μs per stage.

Mechanical force sensors using organic thin-film transistors

“…A more detailed description of the production process is given elsewhere. 10,11 Two distinct transistor layouts were evaluated in this work: TFTs with interdigitated source/drain contacts and relatively short channels ͑channel length 10 m, channel width 1000 m͒, and TFTs with a standard ͑linear͒ contact arrangement and relatively long channels ͓channel length 100 m, channel width 100 m; see Figs. 1͑a͒ and 2͑a͔͒.…”

High performance CMOS-like inverter based on an ambipolar organic semiconductor and low cost metals

“…To date, most of the reported unipolar organic inverter circuits showed some common drawbacks, including relatively narrow noise margin, high power consumption or complicated device structure. 2,6,7 In contrast, good inverter performances have been reported on the CMOS-like inverters. 8,9 Meanwhile, CMOS-like inverter structure enable easier circuit design than the unipolar structure, hence is more desirable for practical applications.…”

Organic semiconductors for organic field-effect transistors

“…in thin-film OFETs [5]. However, pentacene has disadvantages such as instability in air and low solubility in solvents.…”