Printed organic TFTs on flexible substrate for complementary circuits

Organic Thin film Transistors (OTFT) have been widely investigated in these last years as potential candidate for the development of low cost, flexible and lightweight active-matrix backplanes for display applications. Indeed the organic semiconductors provide both promising electrical performances tunable by chemistry and the ability to be processed at low temperature with innovative printing technics on various large scale substrates. Thanks to the recent developments on both n-type and p-type solution-processed organic semiconductors, we have developed a printable organic complementary technology compatible with flexible PEN substrates. By combining state of the art materials exhibiting mobility in the range of 1 cm 2 /V.s and silicon inspired compact modeling and simulation approach, we were able to design and fabricate circuit's building blocks that provide the switching, digital and analog functions required for the fabrication of printed systems on foil

Influence of PEN thermal properties of flexible film patterned by NanoImprint Lithography

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Printed complementary organic thin film transistors based decoder for ferroelectric memory

International audienceThis paper presents a decoder circuit manufactured in a printed complementary organic TFT technology on flexible substrate. Decoder architecture, simulation and experimental results are detailed. In order to comply with current printed electronic capability, a tree based decoding architecture is specifically implemented in order to provide robust functionality with a limited number of transistors. Two different output stages are implemented in order to drive active and passive ferroelectric memory. To drive active matrix, a buffer output stage is proposed, whereas a pass-gate based output stage, with customizable voltage, is used for passive matrix. Characterization results show that the decoder for both output stage options is functional for a wide range of voltage from 40V down to 5V, and for timing between 5ms and 100ms

Printed organic TFTs for interfacing circuits and active matrix

This paper presents a printable organic complementary TFT technology suitable for low cost plastic substrates. By combining state of the art materials, printing technics and silicon-inspired compact modeling and simulation approach, we were able to fabricate circuits that provide the switching, digital and analog functions required for the development of Printed Systems on Foil

High performance printed N and P-type OTFTs enabling digital and analog complementary circuits on flexible plastic substrate

This paper presents a printed organic complementary technology on flexible plastic substrate with high performance N and P-type Organic Thin Film Transistors (OTFTs), based on small-molecule organic semiconductors in solution. Challenges related to the integration of both OTFT types in a common complementary flow are addressed, showing the importance of surface treatments. Stability on single devices and on an elementary complementary digital circuit (ring oscillator) is studied, demonstrating that a robust and reliable flow with high electrical performances can be established for printed organic devices. These devices are used to manufacture several analog and digital building blocks. The design is carried out using a model specifically developed for this technology, and taking into account the parametric variability. High-frequency measurements of printed envelope detectors show improved speed performance, resulting from the high mobility of the OTFTs. In addition, a compact dynamic flip–flop and a low-offset comparator are demonstrated, thanks to availability of both n-type and p-type OTFTs in the technology. Measurement results are in good agreement with the simulations. The circuits presented establish a complete library of building blocks for the realization of a printed RFID tag

High performance printed N and P-type OTFTs for complementary circuits on plastic substrate

This paper presents a printed organic complementary (CMOS) technology on flexible plastic substrate with high performance N and P-type Organic Thin Film Transistors (OTFTs), based on small-molecule organic semiconductors in solution. Challenges related to the integration of both OTFT types in a common CMOS flow are addressed, showing the importance of surface treatments. Data on single devices and elementary CMOS digital circuits (inverters and ring oscillators) are presented, demonstrating that a robust and reliable flow with high electrical performances can be established for printed organic devices

High performance printed N and P-type OTFTs enabling digital and analog complementary circuits on flexible plastic substrate

This paper presents a printed organic complementary technology on flexible plastic substrate with high performance N and P-type Organic Thin Film Transistors (OTFTs), based on small-molecule organic semiconductors in solution. Challenges related to the integration of both OTFT types in a common complementary flow are addressed, showing the importance of surface treatments. Stability on single devices and on an elementary complementary digital circuit (ring oscillator) is studied, demonstrating that a robust and reliable flow with high electrical performances can be established for printed organic devices. These devices are used to manufacture several analog and digital building blocks. The design is carried out using a model specifically developed for this technology, and taking into account the parametric variability. High-frequency measurements of printed envelope detectors show improved speed performance, resulting from the high mobility of the OTFTs. In addition, a compact dynamic flip–flop and a low-offset comparator are demonstrated, thanks to availability of both n-type and p-type OTFTs in the technology. Measurement results are in good agreement with the simulations. The circuits presented establish a complete library of building blocks for the realization of a printed RFID tag

Step toward robust and reliable amorphous polymer field-effect transistors and logic functions made by the use of roll to roll compatible printing processes

International audiencePrinted organic electronic is believed to be one of the next major technological breakthroughs in the field of microelectronic. The use of high throughput standard graphic arts printing to process organic field-effect transistors (OFETs) opens promising perspectives for low cost, large area and flexible circuits. Nevertheless, these techniques are commonly known to produce relatively thick (>1 μm) layers and to require complex inks formulations composed of several additives. In this paper, we demonstrate that screen printing and gravure printing may be highly versatile and could be well appropriate to deposit organic semi-conducting layers. These fast “single step” processes combined with amorphous semi-conducting polymer give thin, uniform and reproducible layers. The performances of printed or spin-coated films are similar and lead to robust and reliable full printed transistors and logic functions. Moreover, the capability of screen printing and gravure to deposit small patterns of semiconductor is discussed. Lines and spaces down to 500 μm are reported without specific inks and tools optimizations

Printed organic TFTs on flexible substrate for complementary circuits

Organic Thin film Transistors (OTFT) have been widely investigated in these last years as potential candidate for the development of low cost, flexible and lightweight active-matrix backplanes for display applications. Indeed the organic semiconductors provide both promising electrical performances tunable by chemistry and the ability to be processed at low temperature with innovative printing technics on various large scale substrates. Thanks to the recent developments on both n-type and p-type solution-processed organic semiconductors, we have developed a printable organic complementary technology compatible with flexible PEN substrates. By combining state of the art materials exhibiting mobility in the range of 1 cm2/V.s and silicon inspired compact modeling and simulation approach, we were able to design and fabricate circuit’s building blocks that provide the switching, digital and analog functions required for the fabrication of printed systems on foil

Printed organic TFTs for interfacing circuits and active matrix

This paper presents a printable organic complementary TFT technology suitable for low cost plastic substrates. By combining state of the art materials, printing technics and silicon-inspired compact modeling and simulation approach, we were able to fabricate circuits that provide the switching, digital and analog functions required for the development of Printed Systems on Foil