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The first organic bipolar transistor developed

The first organic bipolar transistor developed

tech innovation 2022

Organic bipolar transistors can also handle demanding data processing and transmission tasks on flexible electronic elements, such as for electrocardiogram (ECG) data. credit: Jacob Lindenthal

The invention of the transistor by Shockley, Bardeen and Bretton at Bell Laboratories in 1947 ushered in the era of microelectronics and revolutionized our lives. First, the so-called bipolar transistor was invented, in which the negative and positive charge carriers contribute to the current transport; Unipolar field effect transistors were only added later. The increasing performance due to the scaling of silicon electronics in the nanometer range has greatly accelerated the processing of data. However, this very rigid technology is less suitable for new types of flexible electronic components, such as rollable TV displays or for medical applications.

For such applications, transistors made of organic materials, or carbon-based semiconductors, have come into focus in recent years. Organic field effect transistors were introduced in early 1986, but their performance still lags far behind silicon components.

At TU Dresden Prof. A research group led by Carl Leo and Dr. Hans Kleimann has now succeeded in demonstrating for the first time an organic, highly efficient bipolar transistor. Important for this was the use of highly arranged thin organic layers. This new technology is several times faster than previous organic transistors, and for the first time components have reached operating frequencies in the GHz range (i.e., over a billion switching operations per second).

Dr. Shu-zhen Wang, who co-led the project with Dr. Michael Sawatzky, explains that “the first realization of organic bipolar transistors was a major challenge, as we had to create layers of very high quality and new structures. However The excellent parameters of the component make these efforts rewarding.”

Pro. Carl Leo says he “has been thinking about this device for over 20 years and I am thrilled that we are now able to demonstrate it with novel higher order layers. The organic bipolar transistor and its potential as a whole. New perspectives open up organic electronics, as they make possible even demanding tasks in data processing and transmission.” A conceivable future application, for example, is sensor-equipped intelligent patches that process sensor data locally and communicate wirelessly to the outside.

research was published in Nature,

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more information:
Carl Leo et al, Organic Bipolar Transistor, Nature (2022). DOI: 10.1038/s41586-022-04837-4

Provided by Dresden University of Technology

Citation: The first organic bipolar transistor developed (2022, 22 June) Retrieved on 22 June 2022

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