Figure 5. Effects of compression on the complementary ring oscillator and OTFT devices.

(a) Changes in oscillation frequency as a function of compressive strain. Inset figure shows output characteristic of a ring oscillator with an operating voltage of 10 V and an oscillation frequency of 217.7 Hz. Transfer characteristics of (b) p-type and (c) n-type OTFTs operated under no strain (black line) and 50% compressive strain (red line), demonstrating the mechanical stability of the stacked structure.