Stretchable MoS2 Artificial Photoreceptors for E‐Skin

Abstract 2D materials have been widely applied in flexible electronics but only with limited stretchability, because the metal‐halide bonding is so strong that the materials’ electronic properties will be severely influenced upon tensile strain. Here, a strategy is proposed for the fabrication of ultrastretchable MoS 2 photoreceptors based on chemical vapor deposition‐grown or manually stacked multilayer MoS 2 . Strain‐dependent spectroscopic comparisons of multilayer versus monolayer MoS 2 indicate that the strain transfer is suppressed from bottom to top layers owing to interlayer sliding, which is consistent with the density functional theory and molecular dynamics simulations. Thus, the optoelectronic properties of multilayer MoS 2 can withstand larger mechanical strain than monolayer MoS 2 . Leveraging this mechanical feature, ten‐layer MoS 2 photodetector is fabricated on polystyrene‐ b ‐poly (ethylene‐ co ‐butylene)‐ b ‐polystyrene elastomer, withstanding ≈ 50% tensile strain and presenting 32 times higher photoresponsivity than that of monolayer MoS 2 under the same stretching condition. Based on large‐area bilayer MoS 2 film, 5 × 5 stretchable photodetector array is demonstrated and is capable of working as artificial photoreceptors to control a robotic hand under 16% tensile strain, showing great potential in applications for 2D material‐based electronic skin.