Yong Whan Choi

TL;DR: It is demonstrated that sensors based on nanoscale crack junctions and inspired by the geometry of a spider’s slit organ can attain ultrahigh sensitivity and serve multiple purposes, and that they are applicable to highly selective speech pattern recognition and the detection of physiological signals.

TL;DR: In this article, the authors investigated the mechanical fracture behavior of polycrystalline perovskite films by varying the substrate thickness and applying the neutral plane concept, which enabled them to fabricate a crack-free perovskiite film on an ultra-thin substrate (∼2.5 μm) and to demonstrate ultra-flexible solar cells with high efficiency with unprecedented flexibility sustained after 10,000 cycles of bending at a 0.5 mm radius.

TL;DR: This work demonstrates a mechanical crack-based strain sensor with high sensitivity based on the guided formation of straight mechanical cracks that resulted in an exponential dependence of the resistance against the strain, overriding known linear or power law dependences.

TL;DR: Using the transferred lens array, nanoscale metal patterns as small as 130-nm gaps are detected under an optical microscope with a distinguishable resolution.

TL;DR: In this article, the authors presented a highly sensitive pressure and strain sensor based on a cracked transparent epilayer, indium-tin oxide (ITO), deposited on a transparent PET substrate.