%0 Journal Article %A Tao, Kewen %A Li, Yaobin %A Ji, Chengmin %A Liu, Xitao %A Wu, Zhenyue %A Han, Shiguo %A Sun, Zhihua %A Luo, Junhua %D 2019 %T A Lead-Free Hybrid Iodide with Quantitative Response to X‑ray Radiation %U https://acs.figshare.com/articles/journal_contribution/A_Lead-Free_Hybrid_Iodide_with_Quantitative_Response_to_X_ray_Radiation/9198359 %R 10.1021/acs.chemmater.9b02263.s003 %2 https://acs.figshare.com/ndownloader/files/16752290 %K H 2 MDAP %K trap density %K crystal-based X-ray photoconductor %K carrier mobility %K as-grown crystal exhibits %K cm %K NH %K lead-free metal halogen hybrids %K X-ray absorption coefficient %K CH %K Lead-Free Hybrid Iodide %K X-ray detection %K top-seeded solution growth method %X Single crystals of lead halide hybrid perovskites (e. g., CH3NH3PbI3 and CsPbBr3) have been developed as promising candidates for X-ray detection, owing to their excellent attributes including low trap density, high X-ray absorption cross section, and high carrier mobility. The toxicity of lead, however, is a potential bottleneck that hinders their device application toward green and sustainable competitors. Herein, we reported a new lead-free bismuth-iodide hybrid of (H2MDAP)­BiI5 (1, H2MDAP = N-methyl-1,3-diaminopropanium), adopting one-dimensional (1D) metal-halogen frameworks, which behaves as a potential alternative for X-ray detection. Large-size single crystals of 1 with sizes up to 9 × 7 × 4 mm3 were successfully grown via top-seeded solution growth method. The as-grown crystal exhibits notable semiconducting properties, including a narrow bandgap of 1.83 eV, trap density of 3.6 × 1011 cm–3, carrier mobility of 1.42 cm2 V–1 s–1, and high X-ray absorption coefficient. Consequently, the fabricated crystal-based X-ray photoconductor enables the conversion of X-ray to electrical signals with a sensitivity of ∼1.0 μC Gyair–1 cm–2. These results throw light on further exploration on X-ray-sensitive materials based on the lead-free metal halogen hybrids. %I ACS Publications