School of Physical Science and Technology & Lanzhou Center for Theoretical Physics & Key Laboratory of Theoretical Physics of Gansu Province, Lanzhou University, Lanzhou, 730000, China.
State Key Laboratory of Applied Organic Chemistry (SKLAOC), College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou, 730000, China.
Angew Chem Int Ed Engl. 2023 Mar 1;62(10):e202218349. doi: 10.1002/anie.202218349. Epub 2023 Jan 31.
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-NH I ⋅ H 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, H 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 Gy cm and low detection limit (0.14 nGy s ).
具有柔性和可降解特性的无金属钙钛矿（MFPs）已被应用于柔性 X 射线检测。目前，确定结构与器件性能之间的关键因素对于指导 MFPs 的设计至关重要。在此，首次设计并合成了具有改进结构稳定性和器件性能的 MPAZE-NH I ⋅ H O。通过理论计算，引入甲基基团有利于调节容忍因子，增加偶极矩并增强氢键。同时，H O 增加了氢键形成位点，并协同实现能带性质调制、抑制离子迁移和优化结构刚度。光谱分析也证明了改进的电子-声子耦合和载流子复合寿命有助于提高性能。最后，制备了一种具有最高灵敏度 740.8 μC Gy cm 和低检测限（0.14 nGy s ）的柔性和可降解 X 射线探测器。
