Wu Wenqiang, Han Xun, Li Jing, Wang Xiandi, Zhang Yufei, Huo Zhihao, Chen Qiushuo, Sun Xidi, Xu Zhangsheng, Tan Yongwen, Pan Caofeng, Pan Anlian
Key Laboratory for Micro-Nano Physics and Technology of Hunan Province, State Key Laboratory of Chemo/Biosensing and Chemometrics, College of Materials Science and Engineering, Hunan University, Changsha, 410082, China.
CAS Center for Excellence in Nanoscience, Beijing Key Laboratory of Micro-Nano Energy and Sensor, Beijing Institute of Nanoenergy and Nanosystems, Chinese Academy of Sciences, Beijing, 100083, P. R. China.
Adv Mater. 2021 Mar;33(9):e2006006. doi: 10.1002/adma.202006006. Epub 2021 Jan 21.
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 ) and excellent flexibility, is reported. Patterned all-inorganic CsPbBr 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.
溶液法制备的卤化铅钙钛矿被认为是柔性光电子学中有前景的材料之一。然而，超薄柔性钙钛矿光电探测器（PDs）的阵列集成仍然是一个重大挑战，这受到钙钛矿材料与涉及极性液体的制造技术不相容的限制。在此，报道了一种超薄（2.4 µm）且可贴合的基于钙钛矿的PD阵列（10×10像素），其重量超轻（3.12 g m）且具有出色的柔韧性。通过真空辅助滴铸图案化工艺合成了具有精确像素位置、可控形态和均匀尺寸的图案化全无机CsPbBr钙钛矿薄膜作为有源层。使用防水聚对二甲苯-C薄膜作为衬底和封装层，有效地保护了钙钛矿薄膜在剥离过程中免受极性液体的渗透。受益于封装和超薄特性，该器件在环境中表现出长期稳定性，并且在弯曲或50%压缩应变下具有强大的机械稳定性。更重要的是，贴合半球形支撑的超薄柔性PD阵列实现了光分布成像，表明其在视网膜样视觉传感中的潜在应用。
