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.
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!
An innovative high-performance material: biofibers made from green lacewing silk
20.01.2017 | Fraunhofer-Institut für Angewandte Polymerforschung IAP
Treated carbon pulls radioactive elements from water
20.01.2017 | Rice University
An important step towards a completely new experimental access to quantum physics has been made at University of Konstanz. The team of scientists headed by...
Yersiniae cause severe intestinal infections. Studies using Yersinia pseudotuberculosis as a model organism aim to elucidate the infection mechanisms of these...
Researchers from the University of Hamburg in Germany, in collaboration with colleagues from the University of Aarhus in Denmark, have synthesized a new superconducting material by growing a few layers of an antiferromagnetic transition-metal chalcogenide on a bismuth-based topological insulator, both being non-superconducting materials.
While superconductivity and magnetism are generally believed to be mutually exclusive, surprisingly, in this new material, superconducting correlations...
Laser-driving of semimetals allows creating novel quasiparticle states within condensed matter systems and switching between different states on ultrafast time scales
Studying properties of fundamental particles in condensed matter systems is a promising approach to quantum field theory. Quasiparticles offer the opportunity...
Among the general public, solar thermal energy is currently associated with dark blue, rectangular collectors on building roofs. Technologies are needed for aesthetically high quality architecture which offer the architect more room for manoeuvre when it comes to low- and plus-energy buildings. With the “ArKol” project, researchers at Fraunhofer ISE together with partners are currently developing two façade collectors for solar thermal energy generation, which permit a high degree of design flexibility: a strip collector for opaque façade sections and a solar thermal blind for transparent sections. The current state of the two developments will be presented at the BAU 2017 trade fair.
As part of the “ArKol – development of architecturally highly integrated façade collectors with heat pipes” project, Fraunhofer ISE together with its partners...
19.01.2017 | Event News
10.01.2017 | Event News
09.01.2017 | Event News
20.01.2017 | Awards Funding
20.01.2017 | Materials Sciences
20.01.2017 | Life Sciences