Flexible Photodetector Arrays Based on Patterned CH₃NH₃PbI_3−xCl_x Perovskite Film for Real‐Time Photosensing and Imaging

Abstract

optoelectronic industries, flexible optoelectronic devices have been attracting more and more attention owning to their lightweight, better portability, wearable, and low manufacturing cost. [4] Recently, significant breakthroughs of flexible PDs based on various nanomaterials, including quantum dots, [5] nanowires, [6] and 2D layered materials, [7] have been achieved in mechanical stability, flexibility, and stretchability. [8] Particularly, organic-inorganic hybrid perovskite materials have become a promising candidate for flexible PDs with high performances, [9] owning to their large optical absorption coefficient in visible-light range, tunable bandgaps, prolonged carrier life-time, and diffusion lengths. [10] However, a few reports are available about large-scale high-resolution and flexible PD arrays based on the perovskite materials for the real-time light trajectory and the light imaging.The key challenge for large-scale PD arrays based on the perovskite materials is the appropriate and effective synthesis technique for the miniaturization and integration of the device. Traditional fabrication processes, such as chemical vapor deposition (CVD), [11] vapor-phase epitaxial growth method, [12] andThe 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 3 NH 3 PbI 3−x Cl x arrays are synthesized on a poly(ethylene terephthalate) substrate by using a two-step sequential deposition method with the developed Al 2 O 3 -assisted hydrophilic-hydrophobic surface treatment process. The flexible PD arrays with high detectivity (9.4 × 10 11 Jones), large on/off current ratio (up to 1.2 × 10 3 ), 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. Perovskite PhotodetectorsThe ORCID identification number(s) for the author(s) of this article can be found under https://doi.Optoelectronic devices, including photodetectors (PDs), [1] light-emitting diodes (LEDs), [2] and solar cells (SCs), [3] have a vast applications in our daily life, such as optoelectronic communication, imaging technology, environmental monitoring, and digital display. With the development of emerging

High Responsivity and Response Speed Single‐Layer Mixed‐Cation Lead Mixed‐Halide Perovskite Photodetectors Based on Nanogap Electrodes Manufactured on Large‐Area Rigid and Flexible Substrates

“…Notwithstanding the exceptional solar cell performance obtained, another attractive attribute is the fact that they can be used in conjunction with flexible substrates enabling thus the development of portable and wearable optoelectronic devices . For this reason, perovskites have also been recently explored in other optoelectronic applications, such as photodetectors, light‐emitting diodes (LEDs), field‐effect transistors, and resistive switching memory devices, while some of these devices have already been demonstrated with flexible (plastic) substrates . More specifically, with regard to perovskite‐based photodetectors, outstanding performance has been obtained with photodiodes, photoconductors and phototransistors, showing responsivities up to 10 4 A W −1 , detectivity values exceeding by far those of standard Si photodiodes (10 12 –10 14 Jones) and fast photoresponse below nanoseconds .…”

Flexible and Self‐Powered Photodetector Arrays Based on All‐Inorganic CsPbBr3 Quantum Dots

“…In comparison with other perovskite‐based photodetectors, our devices deliver competitive or even superior performance, as summarized in Table 1 . [ 50–58 ] According to the map color variation, over 80% devices exhibited similar performance, indicating spatial photoresponse uniformity.…”

High-Capacity, Fast-Response, and Photocapacitor-Based Terpolymer Phosphor Composite

“…In the retina, light transmitted through lens in human eyes travels through several neuronal layers of the inner retina with virtually zero loss before reaching the photoreceptors. These photoreceptors efficiently absorb light and transform it into an electrical/biochemical signal to the bipolar cells [9]. For instance, in many blindness-causing diseases, photoreceptors degenerate, whereas second-order and projecting neurons are largely unaffected.…”