Semiconductive Coordination Polymer with Multi‐Channel Charge Transfer for High‐Performance Direct X‐ray Detection

Abstract Coordination polymers (CPs) are promising for direct X‐ray detection and imaging owing to higher designability and outstanding stability, however, it remains a challenge to achieve highly X‐ray detection performance, particularly both high sensitivity and low detection limit at the same operating voltage. Herein, we construct a new conjugated CP {[Co(BPTTz)(DIPA)] ⋅ DMA} n ( 1 , BPTTz=2,5‐bis(pyridine‐4‐yl)thiazolo[5,4‐ d ]thiazole, H 2 DIPA=2,5‐diiodoterephthalic acid, DMA= N , N’ ‐dimethylacetamide), with multi‐channel charge transfer by regulating the linker mediated electronic‐state, which reduces carrier losses resulting from recombination or quenching, enhances the efficiency of charge separation and transfer, thus further optimizes X‐ray detection performance. The semiconductor prepared based on this strategy achieves record values including the highest mobility‐lifetime product ( μτ , 8.05×10 −3 cm 2 V −1 ) and the lowest detectable X‐ray dose rate (128 nGy air S −1 , 35 V) among CP‐based direct radiation detectors, as well as a high sensitivity (172 μC Gy air −1 cm −2 , 35 V) at the same operating voltage. This detector shows excellent long‐time air stability under ambient conditions for over three months and operational stability. These findings demonstrate a rational structural design method to enhance the photoelectronic efficiency and stability of semiconductive CPs.