One-Dimensional CsCu₂I₃ Single-Crystal X-ray Detectors

Abstract

Three-dimensional (3D) metal halide perovskites have received sustained attention for X-ray detection and imaging; however, they incur large dark currents that are dozens of times higher than those of commercial X-ray detectors, severely restricting their application in low-dose X-ray radiography. Herein, we propose an alternative saturated precursor cyclic crystallization method to prepare centimeter-sized CsCu2I3 single crystals (SCs) with a one-dimensional (1D) structure. This desirable 1D structure has the advantage of unidirectional and efficient charge carrier transport, which contributes to the reduction of nonradiative recombination. Therefore, the carrier mobility–lifetime (μτ) product and sensitivity of the fabricated CsCu2I3 X-ray detector are 0.01847 cm2 V–1 and 424 μC Gy–1 cm–2, respectively. Impressively, a minimum detectable X-ray dose rate of 0.93 nGy s–1 is obtained, which is significantly lower than that of traditional perovskite-based detectors. Moreover, the fabricated X-ray detectors also achieve direct X-ray imaging with good stability. Our work paves the way for low-dimensional copper halides in next-generation solution-processed high-performance X-ray detectors.

Functional‐Group‐Induced Single Quantum Well Dion–Jacobson 2D Perovskite for Efficient and Stable Inverted Perovskite Solar Cells

“…The trap density of the perovskite films without and with modifiers was quantified by the space charge limited current (SCLC) measurement in Figure 5b. [36] The perovskite film with DMACl 2 possessed the least trap density of 9.94 × 10 14 cm −3 , which was increased to 1.27 × 10 15 and 1.44 × 10 15 cm −3 for the HDACl 2 and control films, respectively, which is consistent with the TRPL and PL results. Figure 5c shows the time-resolved microwave conductivity (TRMC) spectra of the control and modified perovskite films deposited on a bare glass substrate.…”

Hollow Nanostructures of Ternary Ce1–xCuxO2 for Volatile Organic Compound Sensing

“…The structure, phase, and purity of the CeO 2 hollow particles were determined by the analysis of X-ray diffraction data. − The X-ray diffraction patterns of various CeO 2 samples are shown in Figure a. The crystalline pattern indicated no impurity peaks, even after Cu doping.…”

Perovskite materials in X-ray detection and imaging: recent progress, challenges, and future prospects

“…The sensitivity of the device was estimated to be as high as 20 555.1 mC Gy −1 cm −2 , which is superior to certain SC-based perovskite detectors and unquestionably many times larger than some commercial detectors. [119][120][121]124,186 . In addition, they calibrated the LDDR, which was about 127.7 nGy s −1 .…”