Modified Fabrication of Perovskite-Based Composites and Its Exploration in Printable Humidity Sensors

• Published in: Polymers Vol. 14; no. 20; p. 4354
• Main Authors: Peng, Meiting, Zhang, Fan, Tian, Liyong, You, Longbin, Wu, Jiayi, Wen, Nanhua, Zhang, Yangfan, Wu, Yancheng, Gan, Feng, Yu, Hui, Zhao, Jing, Feng, Qi, Deng, Fuqin, Zheng, Longhui, Wu, Yingzhu, Yi, Ningbo
• Format: Journal Article
• Language: English
• Published: Switzerland MDPI AG 16.10.2022; MDPI
• Subjects: Communication; Composite materials; composites; Crystal defects; Crystal structure; Crystals; Drying; Efficiency; Flexibility; Fluorescence; Food quality; Fourier transforms; Handwriting; Humidity; humidity-sensitivity; Logos; Moisture effects; Moisture resistance; Morphology; Optimization; Optoelectronics; Perovskite; Perovskites; Photoelectricity; Photoluminescence; Polyethylene oxide; Polymers; Precursors; Semiconductor materials; Semiconductors; Sensitivity enhancement; Sensors; Solvents; Spectrum analysis; Structural integrity; Structure; China; Japan; composites; humidity-sensitivity; perovskite
• ISSN: 2073-4360; 2073-4360
• DOI: 10.3390/polym14204354

Organic perovskites are promising optoelectronic semiconductor materials with photoelectric applications. It is known that the luminescence of perovskites is highly sensitive to hydron molecules due to its low moisture resistance of crystal structure, indicating its potential application on humidity-sensing. Herein, a novel perovskite-based compound (PBC) with minimal defects was developed to promote the photoluminescence performance via optimization of the drying method and precursor constitutions. Perovskite materials with good structural integrity and enhanced fluorescence performance up to four times were obtained from supercritical drying. Moreover, the hydrophilic polymer matrix, polyethylene oxide (PEO), was added to obtain a composite of perovskite/PEO (PPC), introducing enhanced humidity sensitivity and solution processibility. These perovskite/PEO composites also exhibited long-term stability and manifold cycles of sensitivity to humidity owing to perovskite encapsulation by PEO. In addition, this precursor solution of perovskite-based composites could be fancily processed by multiple methods, including printing and handwriting, which demonstrates the potential and broaden the applications in architecture decoration, logos, trademarks, and double encryption of anti-fake combined with humidity.