Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:


Large-scale field-effect transistors based on solution-grown organic single crystals are fabricated


Field-effect transistors (FETs) made of organic single crystals show superior mobility values as organic single crystals have fewer structural defects than their amorphous and polycrystalline counterparts.

However, single-crystal devices are practically difficult to fabricate. For both fundamental studies and technological applications, high-throughput fabrication of single-crystal FETs is highly desired for either examination of device performance statistics or realization of a large array of devices and has attracted the attention of researchers from both academia and industry.

This image shows an experimental procedure to achieve crystal alignment.

Credit: ©Science China Press

In an article published in Science Bulletin, Prof. Hanying Li's research group describe a simple solution processing method where well-aligned single-crystals of organic semiconductors throughout a 1cm × 2cm substrate can be grown from a droplet pinned by a metal needle.

The well-controlled alignment of the crystals originates from the unidirectional receding of the pinned droplet regulated by the capillary force. Because of the crystal alignment in a large area, fabrication of device arrays become possible.

More importantly, this simple method is applicable to a wide range of organic semiconductors and potentially to inorganic materials, with six examples including both p- and n-channel materials demonstrated in this work.

Furthermore, large-scale FET arrays are fabricated and studied, using TIPS-pentacene crystals (a well-known p-channel material) as an example.

Among the 330 devices randomly selected from 2 substrates, an average hole mobility (μ) of 3.44 ± 1.21 cm2V-1s-1 with the maximum value of 6.46 cm2V-1s-1, on-to-off current ratios (I on/I off) > 10 5, and threshold voltages (VT) between -20 to -58 V were achieved.

Among the 330 devices, 328 FETs showed the mobility above 1 cm2V-1s-1, the other two were 0.94 cm2V-1s-1 and 0.92 cm2V-1s-1 respectively. The achieved FET performance is among the best reported ones. As such, this work provides a highly efficient, yet simple approach to evaluate the charge transport properties of organic semiconductors through examining the performance statistics of single-crystal devices.


See the article:

Shuang Liu, Jiake Wu, Congcheng Fan, Guobiao Xue, Hongzheng Chen, Huolin L. Xin and Hanying Li, "Large-scale fabrication of field-effect transistors based on solution-grown organic single crystals," Science Bulletin, 2015, 60(12): 1122-1127. doi: 10.1007/s11434-015-0817-9.

Hanying Li | EurekAlert!

More articles from Materials Sciences:

nachricht For graphite pellets, just add elbow grease
23.03.2018 | Rice University

nachricht Sensitive grip
23.03.2018 | Fraunhofer-Institut für Produktionstechnik und Automatisierung IPA

All articles from Materials Sciences >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: Space observation with radar to secure Germany's space infrastructure

Satellites in near-Earth orbit are at risk due to the steady increase in space debris. But their mission in the areas of telecommunications, navigation or weather forecasts is essential for society. Fraunhofer FHR therefore develops radar-based systems which allow the detection, tracking and cataloging of even the smallest particles of debris. Satellite operators who have access to our data are in a better position to plan evasive maneuvers and prevent destructive collisions. From April, 25-29 2018, Fraunhofer FHR and its partners will exhibit the complementary radar systems TIRA and GESTRA as well as the latest radar techniques for space observation across three stands at the ILA Berlin.

The "traffic situation" in space is very tense: the Earth is currently being orbited not only by countless satellites but also by a large volume of space...

Im Focus: Researchers Discover New Anti-Cancer Protein

An international team of researchers has discovered a new anti-cancer protein. The protein, called LHPP, prevents the uncontrolled proliferation of cancer cells in the liver. The researchers led by Prof. Michael N. Hall from the Biozentrum, University of Basel, report in “Nature” that LHPP can also serve as a biomarker for the diagnosis and prognosis of liver cancer.

The incidence of liver cancer, also known as hepatocellular carcinoma, is steadily increasing. In the last twenty years, the number of cases has almost doubled...

Im Focus: Researchers at Fraunhofer monitor re-entry of Chinese space station Tiangong-1

In just a few weeks from now, the Chinese space station Tiangong-1 will re-enter the Earth's atmosphere where it will to a large extent burn up. It is possible that some debris will reach the Earth's surface. Tiangong-1 is orbiting the Earth uncontrolled at a speed of approx. 29,000 km/h.Currently the prognosis relating to the time of impact currently lies within a window of several days. The scientists at Fraunhofer FHR have already been monitoring Tiangong-1 for a number of weeks with their TIRA system, one of the most powerful space observation radars in the world, with a view to supporting the German Space Situational Awareness Center and the ESA with their re-entry forecasts.

Following the loss of radio contact with Tiangong-1 in 2016 and due to the low orbital height, it is now inevitable that the Chinese space station will...

Im Focus: Alliance „OLED Licht Forum“ – Key partner for OLED lighting solutions

Fraunhofer Institute for Organic Electronics, Electron Beam and Plasma Technology FEP, provider of research and development services for OLED lighting solutions, announces the founding of the “OLED Licht Forum” and presents latest OLED design and lighting solutions during light+building, from March 18th – 23rd, 2018 in Frankfurt a.M./Germany, at booth no. F91 in Hall 4.0.

They are united in their passion for OLED (organic light emitting diodes) lighting with all of its unique facets and application possibilities. Thus experts in...

Im Focus: Mars' oceans formed early, possibly aided by massive volcanic eruptions

Oceans formed before Tharsis and evolved together, shaping climate history of Mars

A new scenario seeking to explain how Mars' putative oceans came and went over the last 4 billion years implies that the oceans formed several hundred million...

All Focus news of the innovation-report >>>



Industry & Economy
Event News

New solar solutions for sustainable buildings and cities

23.03.2018 | Event News

Virtual reality conference comes to Reutlingen

19.03.2018 | Event News

Ultrafast Wireless and Chip Design at the DATE Conference in Dresden

16.03.2018 | Event News

Latest News

For graphite pellets, just add elbow grease

23.03.2018 | Materials Sciences

Unique communication strategy discovered in stem cell pathway controlling plant growth

23.03.2018 | Agricultural and Forestry Science

Sharpening the X-ray view of the nanocosm

23.03.2018 | Physics and Astronomy

Science & Research
Overview of more VideoLinks >>>