Hydrogen Bonds Strengthened Metal‐Free Perovskite for Degradable X‐ray Detector with Enhanced Stability, Flexibility and Sensitivity

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‐NH4I3 ⋅ H2O 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, H2O 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).

PF6− Pseudohalides Anion Based Metal‐Free Perovskite Single Crystal for Stable X‐Ray Detector to Attain Record Sensitivity

“…[ 20 ] Meanwhile, the enhanced hydrogen bonds are beneficial to improve the structural rigidity and stability of the materials. [ 21 ] However, although the work can alleviate ion migration, the problems of easy oxidation and corrosiveness of iodine ions are difficult to avoid. Recently, hydrogen bonds formed by the halogen atoms have been noticed in MFPs for their sufficient specificity and strength.…”

Organic Cation Design of Manganese Halide Hybrids Glass toward Low‐Temperature Integrated Efficient, Scaling, and Reproducible X‐Ray Detector

“…[18] Since then, excellent works based on MHs X-ray scintillators have been reported successively. [19][20][21][22] However, some of the urgent challenges still hinder its further application: (1) Severe self-absorption effect, which impacts the radioluminescence efficiency; (2) The toxicity of lead (Pb) elements is not environment friendly; [23,24] (3) the most unacceptable is their extreme susceptibility to decomposition in temperature, humidity, or irradiation environment. [25][26][27] To solve the most intractable stability problem, Xu et al cleverly proposed to cope with it by embedding nanocrystals in a transparent amorphous network structure.…”

Centimeter‐Sized Single Crystals of Dion‐Jacobson Phase Lead‐Free Double Perovskite for Efficient X‐ray Detection

“…In the equation, I 0 and V denotes the saturated photocurrent and the applied bias, respectively. [ 47,48 ] The fitted µτ ‐product of SC 1 is ≈1.72 × 10 −3 cm 2 V −1 at a dose rate of 1.27 mGy air s −1 . This value is much higher than other Sb‐based detectors, such as SCs (4,4‐DFPD) 4 AgSbI 8 (≈6.2 × 10 −4 cm 2 V −1 ) [ 49 ] and SCs (FPEA) 3 SbI 6 (≈1.0 × 10 −5 cm 2 V −1 ) [ 50 ] .…”