TOKYO – Toppan Printing has developed a flexible thin-film transistor that reportedly withstands a million bending cycles to a 1mm radius of curvature and demonstrates advantages for practical application, such as an on/off current ratio of at least 107 with carrier mobility of 10cm2/Vs or more.

Toppan has created a TFT with the flexibility to be wound around a mechanical pencil lead, the durability of a flexible printed circuit board, and carrier mobility exceeding 10x that of amorphous silicon TFTs, the firm says.

Flex testing shows no variation in carrier mobility and other properties before and after a million bending cycles to a 1mm radius of curvature.

Toppan aims to advance manufacturing technology, enhance flexibility, durability, and carrier mobility, and target the development of flexible sensors.

"We have achieved unprecedented flexibility and durability by combining existing TFT technologies," said Manabu Ito, development manager at Toppan. "This breakthrough raises the potential for ultra-thin, unbreakable flexible sheet sensors and stretchable devices in the future."

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