Crystal Growth, Structural and Electronic Characterizations of Zero-Dimensional Metal Halide (TEP)InBr Single Crystals for X-Ray Detection.

Recently, metal halides have shown great potential for applications such as solar energy harvesting, light emission, and ionizing radiation detection. In this work, we report the preparation, structural, thermal, and electronic properties of a new zero-dimensional (0D) halide (TEP)InBr (where TEP is tetraethylphosphonium organic cation, CHP). (TEP)InBr single crystals are obtained within a few days of continuous crystal growth time via a solution growth methodology. (TEP)InBr shows a relatively large optical bandgap energy of 4.32 eV and a low thermal conductivity between 0.33±0.05 and 0.45±0.07 W/m-K. Based on the density functional theory (DFT) calculations, the highest occupied molecular orbitals (HOMOs) of (TEP)InBr are dominated by the Br states, while the lowest unoccupied molecular orbitals (LUMOs) are constituted by both In and Br states. (TEP)InBr single crystals exhibit a semiconductor resistivity of 1.73×10 Ω·cm and a mobility-lifetime (mu-tau) product of 2.07×10 cm/V. Finally, a prototype (TEP)InBr single crystal-based X-ray detector with a detection sensitivity of 569.85 uCGycm (at electrical field E=100 V/mm) was fabricated, indicating the potential use of (TEP)InBr for radiation detection applications.