Hydrogen Bonds Strengthened Metal‐Free Perovskite for Degradable X‐ray Detector with Enhanced Stability, Flexibility and Sensitivity. (31st January 2023)

• Record Type: Journal Article
• Authors: Li, Zhizai; Peng, Guoqiang; Li, ZhenHua; Xu, Youkui; Wang, Tao; Wang, Haoxu; Liu, Zitong; Wang, Gang; Ding, Liming; Jin, Zhiwen
• Is Part Of: Angewandte Chemie. Volume 135:Number 10(2023)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2023-01-31
• Subjects: Flexible Devices -- Hydrogen Bonds -- Metal-Free -- Perovskites -- X-Ray Detection; Chemistry -- Periodicals; 540
• DOI: 10.1002/ange.202218349
• Languages: English
• ISSNs: 0044-8249

Abstract

Abstract: Metal‐free perovskites (MFPs) with flexible and degradable properties have been adopted in flexible X‐ray detection. For now, figuring out the key factors between structure and device performance are critical to guide the design of MFPs. Herein, MPAZE‐NH4 I3 ⋅ H2 O was first designed and synthesized with improved structural stability and device performance. Through theoretical calculations, the introducing methyl group benefits modulating tolerance factor, increases dipole moment and strengthens hydrogen bonds. Meanwhile, H2 O increases the hydrogen bond formation sites and synergistically realizes the band nature modulation, ionic migration inhibition and structural stiffness optimization. Spectra analysis also proves that the improved electron‐phonon coupling and carrier recombination lifetime contribute to enhanced performance. Finally, a flexible and degradable X‐ray detector was fabricated with the highest sensitivity of 740.8 μC Gyair −1 cm −2 and low detection limit (0.14 nGyair s −1 ). Abstract : This work first designed and synthesized metal‐free MPAZE‐NH4 I3 ⋅ H2 O perovskites by introducing bulk methyl groups to improve tolerance factor and enhance hydrogen bonds for improving its stability and performance. Importantly, the related flexible X‐ray detector shows the highest sensitivity of 740.8 μC Gyair −1 cm −2, and promises to realize non‐toxic degradation, mechanical bending stability and array imaging for future application.