Flexible Photodetector Arrays Based on Patterned CH<sub>3</sub> NH<sub>3</sub> PbI<sub>3-</sub> <sub>x</sub> Cl<sub>x</sub> Perovskite Film for Real-Time Photosensing and Imaging.
basic_science · Level V
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- Record sourced from PubMed, PMID 30485566.
- Also identified by DOI 10.1002/adma.201805913.
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Abstract
The quest for novel deformable image sensors with outstanding optoelectronic properties and large-scale integration becomes a great impetus to exploit more advanced flexible photodetector (PD) arrays. Here, 10 × 10 flexible PD arrays with a resolution of 63.5 dpi are demonstrated based on as-prepared perovskite arrays for photosensing and imaging. Large-scale growth controllable CH<sub>3</sub> NH<sub>3</sub> PbI<sub>3-</sub> <sub>x</sub> Cl<sub>x</sub> arrays are synthesized on a poly(ethylene terephthalate) substrate by using a two-step sequential deposition method with the developed Al<sub>2</sub> O<sub>3</sub> -assisted hydrophilic-hydrophobic surface treatment process. The flexible PD arrays with high detectivity (9.4 × 10<sup>11</sup> Jones), large on/off current ratio (up to 1.2 × 10<sup>3</sup> ), and broad spectral response exhibit excellent electrical stability under large bending angle (θ = 150°) and superior folding endurance after hundreds of bending cycles. In addition, the device can execute the functions of capturing a real-time light trajectory and detecting a multipoint light distribution, indicating that it has widespread potential in photosensing and imaging for optical communication, digital display, and artificial electronic skin applications.