Enhanced X-ray Sensitivity of MAPbBr₃ Detector by Tailoring the Interface-States Density

Abstract

An important factor for the high performance of lightharvesting devices is the presence of surface trappings. Therefore, understanding and controlling the carrier recombination of the organic−inorganic hybrid perovskite surface is critical for the device design and optimization. Here, we report the use of aluminum zinc oxide (AZO) as the anode to construct a p−n junction structure MAPbBr 3 nuclear radiation detector. The AZO/MAPbBr 3 /Au detector can tolerate an electrical field of 500 V•cm −1 and exhibit a very low leakage current of ∼9 nA, which is 1 order of magnitude lower than that of the standard ohmic contact device. The interface state density of AZO/MAPbBr 3 contact was reduced from 2.17 × 10 10 to 8.7 × 10 8 cm −2 by annealing at 100°C under an Ar atmosphere. Consequently, a photocurrent to dark current ratio of 190 was realized when exposed to a green light-emitting diode with a wavelength of 520 nm (∼200 mW•cm −2). Simultaneously, a high X-ray sensitivity of ∼529 μC•Gy air −1 cm −2 was achieved under 80 kVp X-ray at an electric field of 50 V•cm −1. These results demonstrate the use of surface engineering to further optimize the performance of MAPbBr 3 detectors, which have many potential applications in medical and security detection with low radiation dose brought to the human body.

A review on special wettability textiles: theoretical models, fabrication technologies and multifunctional applications

“…Cloths with oil-water separation are valuable to combat the problems caused by oil spill accidents. 13,14 Moreover, other novel multifunctional applications for superhydrophobic textiles started to merge, including UV-blocking, photocatalytic, ame-retardant, asymmetric superhydrophobic/ superhydrophilic, and stimuli-responsive. These represent potentially high value-added textiles that can be realised by relatively simple chemical treatment.…”

Methylammonium Lead Tribromide Single Crystal Detectors towards Robust Gamma‐Ray Photon Sensing

“…[ 20–22 ] High X‐ray detection sensitivity has been shown in recent years with detectors based on methylammonium lead triidode (MAPbI 3 ) and MAPbBr 3 systems. [ 17,23,24 ] Moreover, high energy γ‐ray detectors were also reported with hybrid and non‐hybrid lead‐based perovskites. Some of the pioneer results in this new application include: CsPbBr 3 showing γ‐ray spectra with a resolution of 3.8% at room temperature for a 662 keV 137 Cs source at room temperature; [ 16 ] MAPbI 3 showing γ‐ray spectra with a resolution of 6.8% at a lower temperature of 2 °C for a 122 keV 57 Co source; [ 18 ] and MAPbBr 2.94 Cl 0.06 showing γ‐ray spectra with a typical resolution of 12% for a 662 keV 137 Cs at room temperature.…”

Preparation of Superhydrophilic and Underwater Superoleophobic Nanofiber‐Based Meshes from Waste Glass for Multifunctional Oil/Water Separation

“…Until now, most superhydrophilic and underwater superoleophobic materials are usually unable to retain their superwetting properties in harsh environments. [27][28][29][30][31][32][33][34][35][36][37] For example, the structure of organic polymer-based superhydrophilic and underwater superoleophobic materials easily deformed at elevated www.advancedsciencenews.com small 2017, 13, 1700391 Figure 2. Oil/water separation performance of the superhydrophilic and underwater superoleophobic NFMs.…”

“…[27][28][29][30] For inorganic oxides/hydroxides-based materials (e.g., ZnO, Cu(OH) 2 , and NiO), their surface architectures were destroyed under strong acidic condition (e.g., pH < 3). [24,[31][32][33][34][35][36][37] As known, the harsh environments, such as strong acidic (e.g., pH 1) and basic solutions (e.g., pH 13), high salinity water, high temperature (e.g., above 100 °C), and corrosive organic solvents, are common in practical oil/water separation applications. In this work, the NFMs were tested under the aforementioned conditions.…”