Analysis of ultrathin organic inverters by using in situ grazing incidence X-ray diffraction under high bending times and low voltage

Low-operating-voltage organic inverters using bilayer cross-linked poly(4-vinylphenol)/Al₂O₃ dielectrics were fabricated on polyimide substrates. The flexible inverters could be operated at a supply voltage of as low as 2 V and achieve a gain of over 50 at 2 V. The organic inverters exhibited good mechanical and electrical stabilities after 10⁴ times of bending due to the superior microstructural stabilities of the organic semiconductors, as confirmed by in situ 2D grazing incidence X-ray diffraction (GIXRD). Analysis of GIXRD spectra showed that the variation in the width of the diffraction peak was less than 1.5% after different bending times. The proposed inverters maintained stable gains of above 50 after 10⁴ times of bending and had a maximum transition voltage shift of 0.31 V during the bending process. These findings imply that our inverters could be commercially applied to low-voltage flexible electronics.