![]() OTFTs being the functional units of organic amplifiers, their performance have to be optimized with respect to the materials employed such as the OSCs, insulators, conducting and passivating materials. Organic amplifiers find application in devices which need monolithic integration of any flexible sensor and the amplifying circuit. In the analog regime, from a fundamental viewpoint, signal amplification is the simplest form of signal processing. Sensing and signal processing of various signals using conformable flexible organic integrated circuits have been actively researched to enable real time sensing on curvilinear surfaces. OTFTs are the primary building blocks of numerous devices such as low-cost radio-frequency identification tags, flexible displays, wearable sensors, medical devices, digital and analog circuits. Complementary circuits, wireless systems, memory and processing units were successfully demonstrated, leading to their potential implementation in different kind of sensors. Over the last decade, the field of organic electronics has grown from discrete single unit fabrication to circuit level integration, due to the development of high–performance organic semiconductors (OSCs), large scale fabrication techniques and understanding of operation mechanism. The differential amplifier realized with p-type Pentacene transistors with mobility, 0.5 cm 2/Vs, exhibited a voltage gain of 10 dB in a frequency bandwidth of 1 kHz. The measurement of the transistor characteristics and the amplifier response reported has been carried out with a wafer probing test jig set up. Electrical characteristics of bottom contact TFTs with polymeric PANi-PSS electrodes is superior to those with conventional metal electrodes due to a lower charge injection barrier and resultant lower contact resistance. The electrodes of the OTFTs were realized using a conductive polymer composite, poyaniline:polystyrene sulphonic acid (PANi-PSS), patterned by a modified Parylene lift-off process. The OTFTs were fabricated with thermally evaporated Pentacene as the semiconducting layer. ![]() ![]() In this study, a single stage differential amplifier is demonstrated with flexible OTFTs. ![]() Organic thin film transistors (OTFTs) fabricated with non-destructive patterning techniques are the building blocks in realizing flexible electronic interface for sensing applications. ![]()
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