Zero-dimensional (0D) organic-inorganic hybrid manganese halides (OIHMnHs) have attracted attention in direct X-ray detection due to their low ionic mobility and high stability. However, the carrier transport and collection in 0D OIHMnHs are restricted by the isolated inorganic polyhedra, limiting their application in high-performance X-ray detectors. Accordingly, optimizing carrier transport properties to achieve high-performance 0D OIHMnH X-ray detectors remains both critically important and challenging. Herein, Zn2+ doping is implemented in 0D TMG2MnBr4 to synthesize TMG2Mn0.93Zn0.07Br4 and TMG2ZnBr4 (TMG = 1,1,3,3-tetramethylguanidine) single crystals. Density functional theory calculations indicate that the A-site cation dominates the conduction band minimum (CBM), forming multidimensional carrier transport pathways between inorganic polyhedra and organic cations. Zn2+ doped in the B site further strengthens cation-anion coupling interactions, suppresses ion migration, reduces defects, and improves charge extraction and transport. The resulting TMG2Mn0.93Zn0.07Br4 SC X-ray detector achieves a μτ product of 1.15 × 10-3 cm2 V-1, a sensitivity of 8017 μC Gyair-1 cm-2, a detection limit of 63.8 nGyair s-1, stable operation, and the demonstration of high-resolution X-ray imaging. This work provides a foundation for developing eco-friendly X-ray detectors with high sensitivity and low-dose detection capabilities for medical imaging and radiation detection applications.
Zhou et al. (Mon,) studied this question.
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