Organic electronics poised to enter the GHz-regime

July 22, 2021 // By Jean-Pierre Joosting
Organic electronics poised to enter the GHz-regime
Vertical organic transistor designs to enable high-frequency operation and low-cost integration, a milestone towards flexible, low-power GHz-electronics.

Physicists of the Technische Universität Dresden have implemented a complementary vertical organic transistor technology that is able to operate at low voltage, with adjustable inverter properties, and a fall and rise time demonstrated in inverter and ring-oscillator circuits of less than 10 nanoseconds, respectively. This development, published in "Nature Electronics”, brings them close to the commercialization of efficient, flexible and printable electronics of the future.

Poor performance is still impeding the commercialization of flexible and printable electronics. Hence, the development of low-voltage, high-gain, and high-frequency complementary circuits is seen as one of the most important targets of research. High-frequency logic circuits, such as inverter circuits and oscillators with low power consumption and fast response time, are the essential building blocks for large-area, low power-consumption, flexible and printable electronics of the future.

The research group "Organic Devices and Systems" (ODS) at the Institute of Applied Physics (IAP) at TU Dresden headed by Dr. Hans Kleemann is working on the development of novel organic materials and devices for high performance, flexible and possibly even biocompatible electronics and optoelectronics. Increasing the performance of organic circuits is one of the key challenges in their research. It was only around a month ago, when PhD-student Erjuan Guo announced an important breakthrough with the development of efficient, printable, and adjustable vertical organic transistors.

Now, building on their previous findings, the physicists demonstrate for the first time vertical organic transistors (organic permeable base transistors, OPBTs) integrated into functional circuits. Dr. Hans Kleemann and his team succeeded in proving that such devices possess reliable performance, long-term stability, as well as unprecedented performance measures.

Picture: 
Image of a 5-stage complementary ring-oscillator composed of organic permeable base transistors. Image courtesy of Erjuan Guo.

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