| 초록 |
Glass and plastics substrate platforms that can be reversibly and repeatedly foldable at pre-designed location(s) without any mechanical failure or deterioration in device performances have been demonstrated. For this, we have engineered well-known substrates such as glass and plastics, either by selective addition of thick backing plates onto uniformly thinned substrates or by selective thinning of substrates. When these substrates having non-uniform thickness are folded together, only the thinned portion(s) of the substrates are mechanically deformed while the remaining parts of the substrates are not. By controlling the width of such thinned parts the fabricated electronics and displays can be repeatedly folded without any mechanical failure. Further, the sample can be dual-folded, along x-direction first followed by another fold along y-direction, leading to reduced sample size down to ~1/4. As proof-of-concept applications, 3*3 arrays of pentacene-based organic thin film transistors (OTFT) and electrochromic (EC) display using tungsten oxide (WO3) have been shown to be reversibly foldable many times, without deteriorating their performance compared to their performance in flat configuration. |
