Ultrathin and Conformable Lead Halide Perovskite Photodetector Arrays for Potential Application in Retina‐Like Vision Sensing

Abstract

Solution‐processed lead halide perovskites are considered one of the promising materials for flexible optoelectronics. However, the array integration of ultrathin flexible perovskite photodetectors (PDs) remains a significant challenge limited by the incompatibility of perovskite materials with manufacturing techniques involving polar liquids. Here, an ultrathin (2.4 µm) and conformable perovskite‐based PD array (10 × 10 pixels) with ultralight weight (3.12 g m−2) and excellent flexibility, is reported. Patterned all‐inorganic CsPbBr3 perovskite films with precise pixel position, controllable morphology, and homogenous dimension, are synthesized by a vacuum‐assisted drop‐casting patterning process as the active layer. The use of waterproof parylene‐C film as substrate and encapsulation layer effectively protects the perovskite films against penetration of polar liquids during the peeling‐off process. Benefitting from the encapsulation and ultrathin property, the device exhibits long‐term stability in the ambient environment, and robust mechanical stability under bending or 50% compressive strain. More importantly, the ultrathin flexible PD arrays conforming to hemispherical support realize imaging of light distribution, indicating the potential applications in retina‐like vision sensing.

Chiral Hybrid Perovskite Single‐Crystal Nanowire Arrays for High‐Performance Circularly Polarized Light Detection

“…[29,30] Furthermore, arranging such CHP into an ordered array would not only enhance the photocurrent by enlarging the active area, but also bring excellent uniformity and reproducibility, which are of great importance for the practical photodetection technology. [31][32][33][34][35][36] Therefore, the development of large-scale CHP arrays with high crystallinity and homogeneous morphology would vastly promote the direct CPL Scheme 1. Design of CHP single-crystalline array for achieving high-performance direct CPL photodetection.…”

Ultrahigh‐Performance Optoelectronic Skin Based on Intrinsically Stretchable Perovskite‐Polymer Heterojunction Transistors

“…[1][2][3][4] However, the emerging e-skin optoelectronic applications like wearable healthcare monitoring, soft robotics, and artificial retinas propose higher requirements for photodetectors, such as high sensitivity, specificity, optical transparency, light weight, ultra-flexibility, and conformal contact with irregular, pliable, and locomotive objects. [5][6][7] However, it remains a considerable challenge to achieve the e-skin optoelectronic devices due to the difficulty in preparing stretchable and photosensitive polymers. [8][9][10] Meanwhile, most of reported photosensitive materials (such as organic small molecules and perovskites) are susceptible to tensile strain or severe mechanical deformations due to their rigid and brittle nature, [11][12][13] which largely restricts the development of optoelectronic skins.…”

Flexible Image Sensors with Semiconducting Nanowires for Biomimic Visual Applications

“…(2.4 μm), ultralight (3.12 g m À2 ), and flexible perovskite photodetector array (10 Â 10 pixels) was reported by Pan and coworkers, [131] and patterned all-inorganic CsPbBr 3 perovskite thin films with precise pixel positions, controllable morphologies, and uniform sizes were synthesized by vacuum-assisted drop-casting patterning as the active layer. The use of waterproof poly (p-xylene-c) membrane as a substrate and coating can help protect the perovskite membrane from the penetration of polar liquid in the stripping process.…”