Significant breakthroughs have been made in the research on the performance stability mechanism of the flexible organic thin-film transistor (OTFT) as the "most core" technology to promote the Internet of Things and smart objects. The research team led by Associate Professor Qiu Zhijun and Professor Liu Ran of the School of Information Science and Engineering at Fudan University announced today the results of "establishing a unified theoretical model for the interaction between water-oxygen electrochemical reactions and organic thin film carriers". Large-scale applications in the field of networking. Related papers were published in the latest issue of the international authoritative academic journal Nature.
Flexible electronic technology has unique flexibility and malleability, and can form smart packaging, wearable health care products, etc., becoming the most core technology that promotes the popularization and large-scale application of the Internet of Things. However, as of now, the industry has not yet figured out the essential mechanism of the unstable performance of OTFT, the core device of flexible electronic technology, which has become an obstacle to its large-scale application.
Since 2008, the Fudan University team has collaborated with Uppsala University in Sweden and the Royal Swedish Institute of Technology to conduct research on OTFT. The team found that modifying organic semiconductor materials doped with carbon nanotubes can successfully increase the mobility of organic thin films by four orders of magnitude, close to the level of polysilicon, and reach practical levels.
After repeated research and demonstration, the team established the model of water-oxygen electrochemical reaction and organic thin film carrier interaction for the first time in China. The study found that water and oxygen in the external environment will be in direct contact with OTFT. After applying forward voltage and reverse voltage respectively, the water-oxygen electrochemical reaction triggered the "sponge effect". In other words, the entire current process is like throwing a lot of sponges in a flowing stream. Under the action of forward voltage, water molecules and oxygen molecules bound the "hole" carriers as if they were absorbing water, and the stream almost dried up without flowing water; while the reverse voltage was applied, the sponge seemed to be squeezed, The water returned to the stream again and resumed its flow. The unified theoretical model can not only explain the internal mechanism that affects the stability of OTFT devices, but also explain the thin film devices with high conductivity characteristics such as carbon nanotubes and graphene, which provides a theoretical basis for the large-scale application of OTFT.
OTFT has shown wide application prospects. As the basic conditions of the Internet of Things continue to mature, transparent mobile phones, folding TVs, windows that can display news, etc. may come into being and enter the lives of ordinary people.
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