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

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Ultrathin and Conformable Lead Halide Perovskite Photodetector Arrays for Potential Application in Retina‐Like Vision Sensing
Advanced Materials ( IF 27.4 ) Pub Date : 2021-01-21 , DOI: 10.1002/adma.202006006
Wenqiang Wu _{1,

2} , Xun Han ₃ , Jing Li ₂ , Xiandi Wang ₂ , Yufei Zhang ₂ , Zhihao Huo ₂ , Qiushuo Chen ₂ , Xidi Sun ₂ , Zhangsheng Xu ₂ , Yongwen Tan ₁ , Caofeng Pan _{2,

4} , Anlian Pan ₁

Affiliation

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.

中文翻译：

超薄且适形的卤化钙钛矿铅光电探测器阵列，可在视网膜样视觉传感中潜在应用

溶液处理的卤化钙钛矿被认为是柔性光电的有前途的材料之一。然而，由于钙钛矿材料与涉及极性液体的制造技术的不相容性，超薄柔性钙钛矿光电探测器（PD）的阵列集成仍然是一项重大挑战。此处报道了一种超薄（2.4 µm）且符合钙钛矿的PD阵列（10×10像素），具有超轻重量（3.12 gm ^-2）和出色的柔韧性。图案化的全无机CsPbBr ₃具有精确像素位置，可控形态和均匀尺寸的钙钛矿薄膜是通过真空辅助滴铸图案化工艺作为活性层而合成的。使用防水聚对二甲苯C膜作为基材和包封层可以有效地保护钙钛矿膜，使其在剥离过程中不渗透极性液体。得益于封装和超薄特性，该器件在周围环境中表现出长期稳定性，并在弯曲或50％压缩应变下具有强大的机械稳定性。更重要的是，符合半球支撑的超薄柔性PD阵列实现了光分布的成像，表明了在视网膜样视觉传感中的潜在应用。

更新日期：2021-03-02

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