High-performance non-volatile memory that can operate under various mechanical deformations such as bending and folding is in great demand for the future smart wearable and foldable electronics. Here we demonstrate non-volatile solution-processed ferroelectric organic field-effect transistor memories operating in p- and n-type dual mode, with excellent mechanical flexibility. Our devices contain a ferroelectric poly(vinylidene fluoride-co-trifluoroethylene) thin insulator layer and use a quinoidal oligothiophene derivative (QQT(CN)4) as organic semiconductor. Our dual-mode field-effect devices are highly reliable with data retention and endurance of >6,000s and 100 cycles, respectively, even after 1,000 bending cycles at both extreme bending radii as low as 500μm and with sharp folding involving inelastic deformation of the device. Nano-indentation and nano scratch studies are performed to characterize the mechanical properties of organic layers and understand the crucial role played by QQT(CN)4 on the mechanical flexibility of our devices.
Bibliographical noteFunding Information:
This project was supported by DAPA, ADD and the Converging Research Center Program through the Ministry of Education, Science, and Technology (MEST) (no. 2011K000631). This research was also supported by the Second Stage of the Brain Korea 21 Project in 2006 and the National Research Foundation of Korea (NRF) grant funded by the Korea government(MSIP) (no. 2007-0056091), the Pioneer Research Center Program through the National Research Foundation of Korea funded by the Ministry of Science, ICT & Future Planning (2010-0019313), National Research Foundation of Korea (NRF) grant funded by the Korea government (MSIP) (no. 2010-0018289) and Basic Science Research Program through the NRF funded by the MEST (NRF-2012R1A1A1042311). J.-C.R. acknowledges support by the Basic Science Researcher Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education, Science and Technology (no. 2012-0000543). T.A. would like to acknowledge funding from the Japanese Society for the Promotion of Science via a JSPS KAKENHI grant (no. 22350084). The synchrotron radiation experiments were performed at the RIKEN Materials Science Beamline (BL44B2) at SPring-8 with the approval of RIKEN (proposal no. 20090100). P.A. would like to thank the Canon Foundation in Europe for having supported his visiting scientist position at RIKEN and SUPA-St Andrews for his advanced research fellowship.
All Science Journal Classification (ASJC) codes
- Biochemistry, Genetics and Molecular Biology(all)
- Physics and Astronomy(all)