Article
Chemistry, Multidisciplinary
Seung-Bum Cho, Jin-Woo Jung, Yoon Seok Kim, Chang-Hee Cho, Il-Kyu Park
Summary: This paper presents a facile method to produce emission wavelength-tunable CsPb(Br1-xClx)(3) NCs using TMSC additive. The addition of TMSC allows for modulation of Cl content in NCs, adjusting the emission peak wavelength and enabling the fabrication of blue and green LEDs with controllable emission wavelengths.
Article
Materials Science, Multidisciplinary
Nils Lamers, Zhaojun Zhang, Ivan G. Scheblykin, Jesper Wallentin
Summary: Metal-halide perovskites (MHPs) are versatile optoelectronic materials that can be modified through anion exchange. This study investigates low temperature gas-phase anion exchange as a method to tune the composition of CsPbBr3 nanowires. Both fuming HCl and Cl-2 gas can be used to control the composition effectively. Cl-2 gas exchange shows better process control and no surface damage. By combining Cl-2 exchange with electron-beam lithography patterning, heterojunction nanowires with varying halide compositions can be produced.
ADVANCED OPTICAL MATERIALS
(2023)
Article
Chemistry, Physical
Hamid M. Ghaithan, Saif M. H. Qaid, Zeyad A. Alahmed, Mahmoud Hezam, Andreas Lyras, Mabrook Amer, Abdullah S. Aldwayyan
Summary: In this study, high-quality inorganic perovskite thin films of CsPb(I1-xBrx)(3) and CsPb(Br1-xClx)(3) were prepared using a thermal evaporation system. Both experiments and first-principles calculations were conducted to investigate the structural, electronic, and optical properties of the films. The band gap of thin-film perovskite was tuned by replacing I- with Br- and then Cl-, and the excitonic effects on optical absorption were considered to properly extract the electronic band gap and exciton binding energy.
JOURNAL OF PHYSICAL CHEMISTRY C
(2021)
Article
Chemistry, Multidisciplinary
Un-Hyok Ko, Jun-Hyok Ri, Jong-Hyok Jang, Chol-Hyok Ri, Un-Gi Jong, Chol-Jun Yu
Summary: All-inorganic halide perovskites have excellent optoelectronic properties and high stabilities. By varying the Cl content x in all-inorganic bromide and chloride perovskite solid solutions CsPb(Br1-xClx)(3), we found that the band gap, elastic constants, effective mass, and exciton binding energy increase with increasing Cl content x, while the mobility and static dielectric constant decrease. The absorption peaks shift from the bromide region to the ultraviolet region with the increase of Cl content x.
Article
Chemistry, Multidisciplinary
A. Malavika, Swapnika Suresh, Mohan Raj Subramaniam, Sudip K. Batabyal
Summary: This study investigates the stability of Mn2+-doped CsPb(Br1-xClx)(3) quantum dots and evaluates their performance by fabricating a photodetector device. The results show that CsPb(Br1-xClx)(3) quantum dots doped with 0.7 mmol Mn2+ exhibit better stability and faster photoresponse.
NEW JOURNAL OF CHEMISTRY
(2023)
Article
Engineering, Electrical & Electronic
Javier Mayen Guillen, Ferdinand Ledee, Oriane Baussens, Marian Chapran, Thibault Lemercier, Jean-Marie Verilhac, Eric Gros-Daillon, Alain Ibanez, Julien Zaccaro
Summary: The study and development of hybrid halide perovskite materials in recent years have provided them with an unprecedented opportunity for direct ionizing radiation detection due to their large attenuation coefficient and sufficient charge carrier mobility lifetime product. By using single crystals as model materials, their intrinsic properties can be investigated. In this study, mixed halide perovskite crystals with bromide partially replaced with chloride were obtained through optimized growths using modified inverse temperature crystallization. X-ray detection devices based on these crystals exhibited improved sensitivity and lower dark current density compared to devices based on methylammonium lead tribromide crystals.
ACS APPLIED ELECTRONIC MATERIALS
(2023)
Article
Polymer Science
Saif M. H. Qaid, Hamid M. Ghaithan, Huda S. Bawazir, Abdullah S. Aldwayyan
Summary: Perovskite-type lead halides show promise in optoelectronic applications, especially in laser technology. However, their poor chemical and colloidal stability at the nanoscale limits further device development. Bulk perovskites, on the other hand, have potential as optical amplifiers. Material development is crucial for achieving high photoluminescence quantum yields and optical gains.
Article
Optics
Mingxing Li, Wenting Liu, Tieshan Yang, Qinfeng Xu, Haifeng Mu, Jing Han, Kunjian Cao, Mengmeng Jiao, Mingliang Liu, Shufang Zhang, Xiaoming Tan, Chuanlu Yang
Summary: The multicolor upconversion luminescence properties of hybrid materials composed of CsPbX3 (X = Br/I) perovskite quantum dots and upconversion nanoparticles (UCNPs) are reported. This achieves stable and bright upconversion luminescence of CsPbX3 perovskite quantum dots under 980 nm excitation. By utilizing UCNPs as a physical energy transfer level, UCNPs/CsPbX3 achieves lower power density excitation compared to the nonlinear upconversion of multi-photon absorption in perovskite, meeting the demand for multi-color upconversion luminescence in optical applications. Combining UCNPs/CsPbX3 with ultraviolet curable resin (UVCR) results in excellent water and air stability, making it suitable for multicolor fluorescent ink in screen printing security labels. The conversion strategy allows the encryption and decryption of messages on the labels using UV light and a 980 nm continuous wave excitation laser as a switch, greatly enhancing forgery difficulty. These findings provide a general method to stimulate photon upconversion and improve the stability of perovskite nanocrystals, with potential applications in anti-counterfeiting.
Article
Chemistry, Multidisciplinary
Hamid M. Ghaithan, Saif M. H. Qaid, Khulod K. AlHarbi, Abrar F. Bin Ajaj, Bandar Ali Al-Asbahi, Abdullah S. Aldwayyan
Summary: Perovskites, as wavelength-tunable lasing materials, have attracted significant scientific attention. This study proposes a thermal evaporation approach to achieve uniform and high-coverage CsPb(Br1-xYx)(3) perovskite polycrystalline thin films and investigates their amplified spontaneous emission (ASE) characteristics. The results demonstrate the notable optical properties of high-quality perovskite thin films, highlighting their potential applications in optoelectronic devices.
Article
Multidisciplinary Sciences
E. Kirstein, N. E. Kopteva, D. R. Yakovlev, E. A. Zhukov, E. V. Kolobkova, M. S. Kuznetsova, V. V. Belykh, I. A. Yugova, M. M. Glazov, M. Bayer, A. Greilich
Summary: The spin dynamics and interaction of confined electrons or holes in perovskite nanocrystals are investigated using time resolved optical spectroscopy. Spin mode locking effect and nuclear focusing are observed in CsPb(Cl0.56Br0.44)(3) lead halide perovskite nanocrystals embedded in a glass matrix. The measured spin coherence time and spin dephasing time are 13 ns and a nanosecond respectively, and the developed theoretical model agrees well with the experimental data.
NATURE COMMUNICATIONS
(2023)
Article
Nanoscience & Nanotechnology
X. Liu, Y. Tong, Q. Wang, X. Liang, Z. Zhang, H. Fan, W. Xiang
Summary: Perovskite nanocrystals (NCs) have shown great potential in wide-color gamut backlight display applications. Traditional methods have limitations, but this study successfully synthesized high-quality CsPbX3 perovskite NCs glass with tunable wavelength using a water quenching method. The resulting CsPbBr1.2I1.8 and CsPbBr3 NCs glass exhibited excellent optical performance due to the rapid cooling rate and maintained a highly uniform glass structure at high temperatures. This research demonstrates the potential of perovskite glass prepared by water quenching in the optoelectronics industry.
MATERIALS TODAY NANO
(2023)
Article
Chemistry, Inorganic & Nuclear
TianYin Shao, Yuanyuan Fang, Chunfeng He, Long Zhang, Kai Wang
Summary: By applying controllable pressure, researchers have found that zero-dimensional lead-free perovskite materials exhibit a blue shift in their emission spectra and a color transformation from yellow to green under pressure. Furthermore, the band gap of the material is reduced. This study provides a fundamental basis for modulating the optical properties of low-dimensional metal halide perovskites.
INORGANIC CHEMISTRY
(2022)
Article
Chemistry, Physical
Qingrong Chen, Jiamian Wang, Yuehan Cao, Caixia Xu, Dongxing Zhao, Tianwei Song, Yunhui Zhang, Yanwei He, Ting Li, Ping Chen, Long Xu
Summary: In this study, polarization dependent light-induced phase segregation was investigated in inorganic CsPb(BrxI1-x)3 perovskite microcrystals, and a theoretical model based on polarons in the unit structure atmosphere was proposed. Light soaking was found to play a crucial role in the phase segregation process, with the polarization of light influencing the migration of ions and the thermodynamics of phase segregation. Experiments also demonstrated the recovery and reproduction of the phase segregation phenomenon through the rotation of the polarization surface of the light, which confirms the effectiveness of suppressing phase segregation and enriches the methods for controlling it to improve material stability. The model based on polarons in the lattice distortion environment was utilized to explain the polarization dependent phase segregation process. This work provides a contactless approach to control phase segregation.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Chemistry, Multidisciplinary
Zhiyuan He, Chencheng Peng, Runda Guo, Ben Chen, Xin Li, Xiangyu Zhu, Jian Zhang, Wenxi Liang, Lei Wang
Summary: This study demonstrates the fabrication of high-efficiency blue perovskite light-emitting diodes (PeLEDs) with tunable emission ranging from 468 to 488 nm. By introducing a novel precursor source into the conventional dual-source co-evaporation system, CsPbBr3-xClx films with high photoluminescence quantum yield (PLQY) are achieved. The PeLEDs with an EL peak at 488 nm exhibit an external quantum efficiency (EQE) of 4.56%, the highest among vacuum-deposited mixed-halide PeLEDs.
Article
Chemistry, Physical
Youngsin Park, Guanhua Ying, Atanu Jana, Vitaly Osokin, Claudius C. Kocher, Tristan Farrow, Robert A. Taylor, Kwang S. Kim
Summary: This study focuses on the observation and control of transverse electromagnetic (TEM) modes in inorganic perovskite lasers, demonstrating the tuning of emission wavelength through pump power and temperature. The research highlights the ability to maintain a constant full width at half maximum (FWHM) without mode-hopping over the entire tuning range.
Article
Materials Science, Multidisciplinary
B. A. Al-Asbahi, S. M. H. Qaid, A. A. A. Ahmed, A. G. El-Shamy
Summary: In this study, n-type bismuth telluride nanorods were incorporated into p-type poly(3,4-ethylene-dioxythiophene):poly(styrenesulphonate) to fabricate a film for electromagnetic interference shielding applications. The electrical conductivity and electromagnetic shielding effectiveness of the film were investigated, showing improved performance with the addition of n-Bi2Te3 nanorods. The film also demonstrated good mechanical properties. It is suggested that these shield films have potential applications in various fields.
MATERIALS CHEMISTRY AND PHYSICS
(2023)
Article
Materials Science, Multidisciplinary
Saif M. H. Qaid, Hamid M. Ghaithan, Huda S. Bawazir, Abdullah S. Aldwayyan
Summary: The crystallization techniques of organic-inorganic hybrid perovskites (OIHP) are effective for light collector or light emitting applications. A perovskite solution was prepared and tetrahydrofuran (THF) was used as a solvent. The rapid crystallization of perovskite in solution was observed, preventing the formation of homogenous thin films. The effects of THF solvent on the direct crystallization of MAPbI3 perovskite were investigated, providing a novel method for room temperature film preparation and potential for the manufacture of low-cost, stable perovskite solar cells.
MATERIALS CHEMISTRY AND PHYSICS
(2023)
Article
Physics, Multidisciplinary
Bandar Ali Al-Asbahi, Arwa Alhamedi Alanezi, Nassar N. Asemi, Saif M. H. Qaid, Mohamed S. AlSalhi
Summary: The photophysical properties of OC1C10-PPV-DMP were modified by incorporating different contents of ZTNCs. The optical parameters of the hybrid nanocomposite thin films were extracted and showed a systematic shift with the increase of ZTNC content. The incorporation of ZTNCs resulted in broadened and improved absorption and emission peaks of the polymer.
Article
Materials Science, Multidisciplinary
Bandar Ali Al-Asbahi
Summary: The incorporation of TiO2 nanoparticles, SiO2 nanoparticles, and their nanocomposite (STNC) into a hybrid polymer improves its optoelectronic properties. The addition of TiO2 and SiO2 nanoparticles to the donor polymer results in a red shift in absorption spectra and an increase in emission intensity. The addition of acceptor polymers and STNCs further enhances the absorption and improves energy transfer. The ternary hybrid with STNC-based organic light-emitting diode demonstrates superior current performance and lower turn-on voltage, attributed to improved Forster resonance energy transfer.
PHYSICA STATUS SOLIDI A-APPLICATIONS AND MATERIALS SCIENCE
(2023)
Article
Polymer Science
Saif M. H. Qaid, Hamid M. Ghaithan, Huda S. Bawazir, Abdullah S. Aldwayyan
Summary: Perovskite-type lead halides show promise in optoelectronic applications, especially in laser technology. However, their poor chemical and colloidal stability at the nanoscale limits further device development. Bulk perovskites, on the other hand, have potential as optical amplifiers. Material development is crucial for achieving high photoluminescence quantum yields and optical gains.
Article
Chemistry, Multidisciplinary
Saif M. H. Qaid, Hamid M. Ghaithan, Huda S. Bawazir, Abrar F. Bin Ajaj, Khulod K. AlHarbi, Abdullah S. Aldwayyan
Summary: This study aims to synthesize various TiO2 nanocrystals, including nanosheets, nanorods, and nanoparticles, using a rapid hydrothermal method. The synthesized TiO2 nanocrystals exhibit high purity and exposed high-energy facets, resulting in high reactivity and large surface area. The {001} facets dominate in the nanosheets and nanorods, accounting for approximately 80% and 85% of the outer surface area, respectively.
Article
Chemistry, Inorganic & Nuclear
Zhihao Guo, Weixian Chen, Huaxin Wang, Wensi Cai, Saif M. H. Qaid, Zhigang Zang
Summary: This study reveals that the molecular conformation of the additives significantly affects the PbI2 films and the performance of perovskite solar cells (PSCs). The symmetrical biuret additive improves the crystallinity of the PbI2 film, while the asymmetrical dithiobiuret additive damages the PbI2 film. Therefore, the biuret-modified PSCs achieve enhanced power conversion efficiency, negligible hysteresis, and prolonged stability.
INORGANIC CHEMISTRY
(2023)
Article
Chemistry, Inorganic & Nuclear
Xin Yang, Saif M. H. Qaid, Baiqian Wang, Wensi Cai, Qingkai Qian, Zhigang Zang
Summary: Metal halides, especially low-dimensional ones, are gaining attention for their outstanding optoelectronic properties. In this study, a novel copper-based metal halide ([Na-2(DMSO)(8)]Cu4Br6) is reported as a near-infrared light source with impressive quantum efficiency and a large Stokes shift. The study demonstrates its potential application as an invisible light source in night vision, enriching the family of low-dimensional metal halide materials.
INORGANIC CHEMISTRY
(2023)
Article
Chemistry, Physical
Haichao Yang, Wensi Cai, Ming Wang, Saif M. H. Qaid, Zhiyuan Xu, Huaxin Wang
Summary: The introduction of sodium alginate (SA) into perovskite solar cells improves the carrier dynamics, stability, and performance by inhibiting nonradiative recombination and retarded charge dynamics.
Article
Energy & Fuels
Shujahadeen B. Aziz, Rebar T. Abdulwahid, Pshko A. Mohammed, Srood O. Rashid, Ari A. Abdalrahman, Wrya O. Karim, Bandar A. Al-Asbahi, Abdullah A. A. Ahmed, M. F. Z. Kadir
Summary: This study investigates a novel biodegradable green polymer electrolyte for energy storage. Results show that the sample with added glycerol has the highest conductivity. The primary conduction species in the electrolyte are ions. Testing confirms that the sample can withstand a voltage suitable for practical applications.
JOURNAL OF ENERGY STORAGE
(2024)
Article
Materials Science, Multidisciplinary
Muhammad Ijaz, Hafeez Ullah, Bandar Ali Al-Asbahi, Mati Ullah Khan, Zaheer Abbas, Sana Ullah Asif
Summary: M-type BaFe11.4-xAlxCo0.6O19 hexaferrites with Al3+ substitutions were synthesized using the co-precipitation method followed by Sonochemical process. The synthesized materials were characterized using XRD, FTIR, UV-vis spectroscopy, VSM, SEM, and LCR meter. The results showed that aluminum doping decreased the band gap and enhanced the magnetic and dielectric properties of the hexaferrites, making them suitable for various applications.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2024)
Article
Chemistry, Applied
Do-Yeon Hwang, Puttavva Meti, Fahad Mateen, Da-Sol Lee, Ye-Jin Yang, Jun-Sik Eom, Ji-Won Shin, Saif M. H. Qaid, Young-Dae Gong, Sung-Kyu Hong
Summary: In this study, LSCs were fabricated using the pyrrolopyrazine-based organic fluorophore PP2 with an intramolecular charge transfer function and aggregation-induced emission. PP2 showed strong absorption and high photoluminescence quantum efficiency in the PMMA matrix, and demonstrated corresponding external and internal photon efficiencies. This research introduces PP2 as a promising fluorophore for advancing the field of LSC technology.
Article
Chemistry, Multidisciplinary
Debashish Nayak, Ram Bilash Choudhary, Bandar Ali Al-Asbahi, Abdullah Ahmed Ali Ahmed
Summary: The incorporation of semiconducting materials into conjugated polymers improves the properties of optoelectronic devices. In this study, polycarbazole-zinc sulfide (PCZ) composites were synthesized and thin films were produced. The addition of zinc sulfide enhanced charge transfer qualities, resulting in better photophysical and electrical characteristics.
Article
Engineering, Electrical & Electronic
U. Chalapathi, Alla Subba Reddy, P. Reddy Prasad, G. Manjula, Sambasivam Sangaraju, Rajesh Cheruku, Bandar Ali Al-Asbahi, Salh Alhammadi, C. Parthasaradhi Reddy, Krithikaa Mohanarangam, B. Purusottam Reddy, Si-Hyun Park
Summary: This study reports the fabrication and characterization of AgSbS2 thin films, which showed different phase structures at different sulfurization temperatures. The optical and electrical properties of the films were analyzed. AgSbS2 solar cells were also fabricated, exhibiting a certain level of efficiency. However, the device processing conditions need further optimization.
MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
(2023)