Stretchable MoS2 Artificial Photoreceptors for E‐Skin. (23rd November 2021)

• Record Type: Journal Article
• Authors: Zhang, Weifeng; Liu, Yulong; Pei, Xue; Yuan, Zhihong; Zhang, Yan; Zhao, Zihan; Hao, He; Long, Run; Liu, Nan
• Is Part Of: Advanced functional materials. Volume 32:Number 10(2022)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2021-11-23
• Subjects: artificial photoreceptor arrays -- interlayer sliding -- multilayer MoS 2 -- photodetector -- stretchable electronics; Materials -- Periodicals; Chemical vapor deposition -- Periodicals; 620.11
• DOI: 10.1002/adfm.202107524
• Languages: English
• ISSNs: 1616-301X

Abstract

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 MoS2 photoreceptors based on chemical vapor deposition‐grown or manually stacked multilayer MoS2 . Strain‐dependent spectroscopic comparisons of multilayer versus monolayer MoS2 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 MoS2 can withstand larger mechanical strain than monolayer MoS2 . Leveraging this mechanical feature, ten‐layer MoS2 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 MoS2 under the same stretching condition. Based on large‐area bilayer MoS2 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. Abstract : Here, a strategy is proposed for fabricating ultrastretchable MoS2 photoreceptors based on multilayer MoS2 . The ten‐layer MoS2 photodetector on polystyrene‐ b ‐poly (ethylene‐ co ‐butylene)‐ b ‐polystyrene (SEBS) elastomer can withstand ≈50% tensile strain and presents 32 times higher photoresponsivity than that of monolayer MoS2 . Large‐area bilayer MoS2 array is demonstrated and is capable of working as artificial photoreceptors to control a mechanical hand under 16% tensile strain.