Article
Chemistry, Multidisciplinary
Yihui He, Ido Hadar, Michael C. De Siena, Vladislav V. Klepov, Lei Pan, Duck Young Chung, Mercouri G. Kanatzidis
Summary: This work reports the use of spectroscopic-grade CsPbBr3 detectors for hard X-ray detection, which can register the energies of individual X-ray interactions with superior resolution. The sensitivity of the detectors can be enhanced by controlling the X-ray energies, flux, and voltage, and they have great potential for X-ray photon-counting systems.
ADVANCED FUNCTIONAL MATERIALS
(2022)
Article
Materials Science, Multidisciplinary
Lei Pan, Indra Raj Pandey, Antonino Miceli, Vladislav V. Klepov, Duck Young Chung, Mercouri G. Kanatzidis
Summary: A perovskite CsPbBr3 single-crystal detector capable of operating at high X-ray fluxes is reported. The detector shows good performance in terms of gamma-ray energy resolution, dark current, photocurrent linearity, and reproducibility at different X-ray energy levels. It is anticipated that CsPbBr3 detectors will have wide application in high-flux X-ray detection.
ADVANCED OPTICAL MATERIALS
(2023)
Article
Engineering, Biomedical
Kevin Treb, Jeff Radtke, Wesley S. Culberson, Ke Li
Summary: In photon counting detectors, the accumulation of electric pulses induced by multiple x-ray photons can lead to count losses. This study introduces an inexpensive readout circuit element to collect time-integrated charge to correct for pile-up-induced count losses. Experimental results demonstrate that this correction method can restore the count accuracy of paralyzable photon counting detectors, without impacting the spatial resolution of the images.
PHYSICS IN MEDICINE AND BIOLOGY
(2023)
Article
Chemistry, Multidisciplinary
Zhongzhi Jiang, Qiliang Ni
Summary: This paper presents a new electronic signal processing system scheme using a digital trapezoidal shaping filter instead of a traditional Gaussian shaping filter, which enables the detector to maintain a high resolution at high count rates.
APPLIED SCIENCES-BASEL
(2023)
Article
Chemistry, Physical
Tongyu Shi, Wenjun Liu, Jiongtao Zhu, Xiongsheng Fan, Zhengyu Zhang, Xingchen He, Rui He, Jiahong Wang, Kezhen Chen, Yongshuai Ge, Xiangming Sun, Yanliang Liu, Paul K. Chu, Xue-Feng Yu
Summary: In this study, CsPbBr3 micro-bricks powder with a cubic shape and high crystallinity was prepared using dimethyl sulfoxide (DMSO) at room temperature. The CsPbBr3-DMSO adduct formed during the process, and when subjected to hot isostatic processing, the released DMSO vapor facilitated the formation of a compact and dense CsPbBr3 wafer with excellent charge transport properties. The CsPbBr3 wafer exhibited high sensitivity, low detection limit, and robust stability in X-ray detection, making it a promising material for high-contrast X-ray detection.
Article
Materials Science, Multidisciplinary
Sixin Chen, Weiwei Liu, Meng Xu, Pan Shi, Menghua Zhu
Summary: An improved electrospray method is developed to prepare a flexible CsPbBr3 film with an area of 5x5 cm². The film exhibits high crystallinity and no defects, and an assembled interdigital detector shows excellent X-ray sensitivity and detection limit.
JOURNAL OF MATERIALS CHEMISTRY C
(2023)
Article
Nanoscience & Nanotechnology
Benjamin T. Diroll, Progna Banerjee, Elena V. Shevchenko
Summary: The two-dimensional CsPbBr3 nanoplatelets exhibit a tunable band gap and strong plane-polarized absorption and emission transitions. Optical anisotropy decreases with increasing nanoplatelet thickness. Larger cuboidal CsPbBr3 nanocrystals also show positive anisotropy. The observed planar absorption and emission in CsPbBr3 nanoplatelets have potential for enhancing the efficiency of light-emitting devices.
Article
Chemistry, Multidisciplinary
Lei Pan, Zhifu Liu, Claire Welton, Vladislav V. Klepov, John A. Peters, Michael C. De Siena, Alessandro Benadia, Indra Pandey, Antonino Miceli, Duck Young Chung, G. N. Manjunatha Reddy, Bruce W. Wessels, Mercouri G. Kanatzidis
Summary: A solution-grown all-inorganic perovskite CsPbBr3 single-crystal semiconductor detector capable of operating under extremely intense X-rays is reported. The detector exhibits high sensitivity, low detection limit, excellent photocurrent linearity, and reproducibility.
ADVANCED MATERIALS
(2023)
Article
Engineering, Biomedical
Kishore Rajendran, Martin Petersilka, Andre Henning, Elisabeth Shanblatt, Jeffrey Marsh, Jamison Thorne, Bernhard Schmidt, Thomas Flohr, Joel Fletcher, Cynthia McCollough, Shuai Leng
Summary: The study evaluated a full field-of-view photon-counting detector computed tomography system using phantoms and patient examples, showing excellent performance in image quality and potential clinical impact.
PHYSICS IN MEDICINE AND BIOLOGY
(2021)
Article
Materials Science, Multidisciplinary
Xueying L. Quinn, Rishi E. Kumar, Moses Kodur, Deniz N. Cakan, Zhonghou Cai, Tao Zhou, Martin V. Holt, David P. Fenning
Summary: Europium as a B-site additive in CsPbBr3 perovskite crystals reduces microstrain, improves photoluminescence yield, and enhances X-ray hardness. Despite variations in the degree of europium incorporation locally, the findings show promise for europium as an additive in perovskite optoelectronic devices.
ADVANCED OPTICAL MATERIALS
(2021)
Article
Chemistry, Multidisciplinary
Peng Zhang, Yunqiu Hua, Yadong Xu, Qihao Sun, Xiang Li, Fucai Cui, Lin Liu, Yanxiao Bi, Guodong Zhang, Xutang Tao
Summary: In this study, the electrical properties and X-ray detection performances of CsPbBr3-nIn single crystals were improved by doping iodine atoms. The resistivity of CsPbBr3-nIn single crystals increased, decreasing the detection limit and restraining the leak current. The CsPbBr3-nIn single crystals showed stable dark currents, achieving record sensitivity and low detection limit for X-ray detection.
ADVANCED MATERIALS
(2022)
Article
Optics
Wonsang Hwang, Dongeun Kim, Sucbei Moon, Dug Young Kim
Summary: The study enhanced the photon count rate in a digitally implemented TCSPC system by using a hybrid photodetector (HPD) to analyze the photoelectronic responses from a single photon-sensitive photodetector. The combination of digital TCSPC with HPD provides an ultimate solution for high photon count rates, as demonstrated in fluorescence lifetime measurement experiments.
Article
Chemistry, Multidisciplinary
Junfeng Lu, Xiaopeng He, Juan Xu, Fangtao Li, Qingbin Tang, Xiaoxuan Wang, Jun Dai, Qiushi Yao, Feifei Qin, Chunxiang Xu
Summary: In this study, CsPbBr3 microwires were used as gain media and microresonators to achieve two-photon pumped frequency upconversion single-mode lasing. Theoretical calculation and experimental validation showed that CsPbBr3 microwires possess the capability to achieve this output, and the relationship between exciton binding energy and light emission was extracted.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Chemistry, Physical
Sumanta Paul, Gautam Kishore, Anunay Samanta
Summary: In this study, the photoluminescence blinking phenomenon of quantum confined CsPbBr3 nanocrystals with different sizes was investigated. The recombination pathways and dynamics of the photogenerated charge carriers were analyzed in both immobilized and fluid conditions. The results showed that smaller nanocrystals had a higher carrier trapping rate and a more difficult detrapping process. These findings provide valuable information for designing photoluminescent samples of CsPbBr3 nanocrystals for optoelectronic applications.
JOURNAL OF PHYSICAL CHEMISTRY C
(2023)
Article
Materials Science, Multidisciplinary
Li Xiang, Xuekai Huang, Ya Wang, Zhilong Xin, Gaoda Chai, Yangbing Xu, Kai Wang, Jun Chen, Chuan Liu, Xinwei Wang, Shengdong Zhang, Hang Zhou
Summary: The proposed organic-inorganic hybrid strategy improves the X-ray sensitivity of organic photodetectors, showing great potential for the development of next generation low-cost, portable, and highly sensitive X-ray detectors.
ORGANIC ELECTRONICS
(2021)
Article
Materials Science, Multidisciplinary
Lei Pan, Indra Raj Pandey, Antonino Miceli, Vladislav V. Klepov, Duck Young Chung, Mercouri G. Kanatzidis
Summary: A perovskite CsPbBr3 single-crystal detector capable of operating at high X-ray fluxes is reported. The detector shows good performance in terms of gamma-ray energy resolution, dark current, photocurrent linearity, and reproducibility at different X-ray energy levels. It is anticipated that CsPbBr3 detectors will have wide application in high-flux X-ray detection.
ADVANCED OPTICAL MATERIALS
(2023)
Article
Nanoscience & Nanotechnology
Vladislav V. Klepov, Michael C. De Siena, Indra R. Pandey, Lei Pan, Khasim Saheb Bayikadi, Serkan Butun, Duck Young Chung, Mercouri G. Kanatzidis
Summary: The practical application of laser scribing in electrode patterning on perovskite CsPbBr3 detectors is explored. The experimental results show that laser scribing can achieve high-quality patterns with minimal damage to the crystal and low interpixel cross-talk. The energy resolution in gamma-ray spectra is up to 6.1% at 122 keV.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Chemistry, Multidisciplinary
Lei Pan, Zhifu Liu, Claire Welton, Vladislav V. Klepov, John A. Peters, Michael C. De Siena, Alessandro Benadia, Indra Pandey, Antonino Miceli, Duck Young Chung, G. N. Manjunatha Reddy, Bruce W. Wessels, Mercouri G. Kanatzidis
Summary: A solution-grown all-inorganic perovskite CsPbBr3 single-crystal semiconductor detector capable of operating under extremely intense X-rays is reported. The detector exhibits high sensitivity, low detection limit, excellent photocurrent linearity, and reproducibility.
ADVANCED MATERIALS
(2023)
Article
Physics, Applied
Zhifu Liu, John A. Peters, Lei Pan, Vladislav Klepov, Michael De Siena, Alessandro Benadia, Duck Young Chung, Mercouri G. Kanatzidis, Bruce W. Wessels
Summary: Recently, the focus has been on developing x-ray and gamma ray detectors with large volume and high energy resolution that can operate at room temperature. To achieve this, it is necessary to increase the carrier mobility-lifetime product and minimize the concentration of electronic trap states. Thorough measurements and comparisons were conducted on CsPbBr3 halide perovskite single crystals to understand their origins and trap parameters. The results showed that crystals with trap concentrations below 1 x 10(14) cm(-3) exhibited appreciable detector performance.
APPLIED PHYSICS LETTERS
(2023)
Article
Physics, Applied
Lei Pan, Indra Raj Pandey, Zhifu Liu, John A. Peters, Duck Young Chung, Conny Hansson, Bruce W. Wessels, Antonino Miceli, Mercouri G. Kanatzidis
Summary: In this study, the polarization effects of perovskite CsPbBr3 semiconductor detectors were investigated using high-flux synchrotron x rays. The detectors did not exhibit significant polarization until a flux higher than 10(10) photons s(-1) mm(-2). The spatial and temporal effects of polarization were visualized using the pump-and-probe technique. It was found that stronger applied electric fields and fewer carrier traps can mitigate polarization.
JOURNAL OF APPLIED PHYSICS
(2023)
Article
Chemistry, Physical
Eugenia S. Vasileiadou, Imra S. Tajuddin, Michael C. De Siena, Vladislav V. Klepov, Mikael Kepenekian, George Volonakis, Jacky Even, Lukasz Wojtas, Ioannis Spanopoulos, Xiuquan Zhou, Abishek K. Iyer, Julie L. Fenton, William R. Dichtel, Mercouri G. Kanatzidis
Summary: A new family of 3D cubic hybrid metal halides has been reported, which exhibits luminescent properties. The materials are synthesized through a one-step solvothermal reaction and an in situ N-alkylation process. The structure of the materials consists of unprecedented [Pb11X31]^9- one-dimensional chains embedded with [T-Et-6]^3+ cations, resulting in weak broad emission centered at 660nm observed at 78K.
CHEMISTRY OF MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Sergei A. Novikov, James Casey, Hope A. Long, Joshua C. Bledsoe, Jason J. Locklin, Vladislav V. Klepov
Summary: The physical properties of copper chalcogenides are influenced by the covalent nature of Cu-S bonds. The oxidation states of Cu and S/Se in these compounds are still debated. Recent studies on covellite CuS showed strong hybridization and almost equal distribution of electron deficiency on Cu1+ and S2- ions. This article reports the synthesis of a new compound NaCu4S3 and its metallic properties and magnetic behavior.
CRYSTAL GROWTH & DESIGN
(2023)
Article
Materials Science, Multidisciplinary
Hsinhan Tsai, Lei Pan, Xinxin Li, Jinkyoung Yoo, Sergei Tretiak, Xuedan Ma, Lei R. Cao, Wanyi Nie
Summary: The study reports a perovskite polycrystalline thin film detector fabricated by solution method, which is a low-cost, scalable technology for radiation imaging. However, the thin volume of the detector limits its sensing efficiency for high-energy X-ray photons. Detailed characterizations reveal that a charge multiplication effect is responsible for the observed high gain. The study also identifies that the use of butylamine spacers in the 2D perovskite thin film leads to a larger efficiency gain compared to phenylethylamines.
ADVANCED OPTICAL MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Joshua Bledsoe, Grant Crane, Jessica Drewke, James Casey, Vladislav Klepov, Jason Locklin
Summary: A nicotinic acid concentration of 2 w/w% was found to be the optimal concentration for achieving the best nucleation performance in a poly(hydroxy-butyrate-co-hydroxy-hexanoate) copolymer, resulting in rapid recrystallization and the formation of highly active crystals.
ACS APPLIED POLYMER MATERIALS
(2023)