Abstract
AbstractInorganic material‐based devices are well known for their high performance, excellent stability, and hence suitability for fast computation and communication. But their nonflexibility and nonstretchability often hinder their application in several emerging areas where conformability with irregular 3D surfaces is required in addition to the high performance. Herein, with honeycomb like patterns, the omnidirectional stretchability and conformability of inorganic material‐based device are demonstrated without sacrificing the performance. The simple method presented here facilitates the transfer of patterned inorganic material‐based devices from rigid poly(methyl methacrylate) (PMMA)/glass substrate onto flexible/stretchable substrate such as polydimethylsiloxane simply by placing a water droplet at the PMMA/glass interface. As a proof of concept, the intrinsically brittle indium–gallium–zinc oxide (IGZO)‐based stretchable photodetector devices are fabricated. These devices can be stretched up to 10% without performance degradation, which is a significant improvement considering the less than ≈1% fracture limit of IGZO. With Au decoration, these devices show 127‐fold higher responsivity (295.3 mA W−1) than planar IGZO devices. The higher fracture strain together with the omnidirectional stretchability underpinned by the honeycomb pattern could allow presented devices to conform to complex hemispherical surfaces such as the human eyes, thus showing significant potential for future high‐performance stretchable electronics.
Highlights
Inorganic material-based devices are well known for their high performance, excellent stability, and suitability for fast computation and communication
An optical image of honeycomb-patterned gold electrode and digital image of honeycomb-patterned indium–gallium–zinc oxide (IGZO)-photodetector array, on poly(methyl methacrylate) (PMMA) substrate after peeling it off from the underlying glass slide, and their schematic representations are shown in Figure 1b,c, respectively
The omnidirectional stretchable inorganic IGZObased photodetector devices with stable performance were demonstrated in this manuscript using honeycomb-patterned structures
Summary
This enhanced performance is due to interband transition of Au electrons in the UV regime[26] and/or hole-trapping at Au/IGZO interface.[27] Upon UV illumination, the filled d-band in Au provides large number of electrons for the interband excitation from 5d to 6sp (Figure S7a, Supporting information,).[28] In the presence of applied bias, the excited electrons are transferred to the conduction band of IGZO at Au/IGZO interface resulting in enhanced photoconductivity. Attached to complex concave or convex structure to mimic the human eyes, as the maximum induced strain on the device array conformally attached to the hemispherical eye module is
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