Article
Chemistry, Physical
Shaked Dror, Sasha Khalfin, Noam Veber, Arad Lang, Yaron Kauffmann, Maria Koifman Khristosov, Reut Shechter, Boaz Pokroy, Ivano E. Castelli, Yehonadav Bekenstein
Summary: Double-perovskite structures with the composition of Cs2AgBiBr6 are suggested as emerging inorganic semiconductors for solar energy conversion. Colloidal synthesis provides a methodological basis for investigating single monolayer two-dimensional materials and using them as building blocks for a more stable bilayer structure and thicker nanoplates. The colloidal approach enables the use of high-resolution transmission electron microscopy to detect structural defects, which is essential for improving the properties of bismuth-based lead-free double perovskites and bringing them closer to real-life photovoltaic implementation.
CHEMISTRY OF MATERIALS
(2023)
Article
Chemistry, Physical
Naveen Kumar Tailor, Saurabh K. Saini, Pankaj Yadav, Mahesh Kumar, Soumitra Satapathi
Summary: Lead-free Cs2AgBiBr6 double perovskites show potential as an alternative to lead-based halide perovskites for photovoltaic and optoelectronic applications. This study reveals that the formation of small polarons and their localization limit the carrier dynamics in Cs2AgBiBr6 double-perovskite halide materials. The dominant conduction mechanism is found to be single polaron hopping. These findings provide important insights into the intrinsic limitations of Cs2AgBiBr6 perovskites and their applicability to other bismuth-based semiconductors.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2023)
Article
Multidisciplinary Sciences
Heng Zhang, Elke Debroye, Wenhao Zheng, Shuai Fu, Lucia D. Virgilio, Pushpendra Kumar, Mischa Bonn, Hai Wang
Summary: The study reveals enhanced hot carrier mobility in Cs2AgBiBr6 double perovskite, with hot carriers showing up to fourfold enhancement compared to cold carriers and capable of long-range hot carrier transport. Evidence suggests that the enhanced conductivity primarily comes from hot holes with reduced momentum scattering in Cs2AgBiBr6. The findings suggest Cs2AgBiBr6 as a promising platform for studying hot carrier transport fundamentals and developing hot carrier-based optoelectronic devices.
Article
Chemistry, Multidisciplinary
Baoning Wang, Na Li, Lin Yang, Chunxiang Dall'Agnese, Ajay Kumar Jena, Tsutomu Miyasaka, Xiao-Feng Wang
Summary: The photovoltaic performance of Cs2AgBiBr6 perovskite was improved by introducing indoline dyes, leading to higher power conversion efficiencies and short-circuit current densities in the hybrid cells. The double perovskite functioned as a p-type interlayer to enhance overall performance.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2021)
Article
Chemistry, Physical
Adam D. Wright, Leonardo R. Buizza, Kimberley J. Savill, Giulia Longo, Henry J. Snaith, Michael B. Johnston, Laura M. Herz
Summary: The study investigates the evolution of photoexcited charge carriers in Cs2AgBiBr6 and reveals rapid localization of free carriers in an intrinsic small polaronic state, induced by strong electron-phonon coupling. Additionally, temperature-activated mobilities and broad emission from color centers were observed, suggesting a complex charge carrier dynamics in the material.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2021)
Review
Chemistry, Multidisciplinary
Hongwei Lei, David Hardy, Feng Gao
Summary: Cs2AgBiBr6 as a benchmark lead-free double perovskite has shown promising potential in various applications such as solar cells, light/X-ray detectors, and ferroelectric/magnetic devices due to its high stability and exceptional optoelectronic properties. However, challenges still exist in Cs2AgBiBr6 materials and related applications, which require further research and exploration in the future for development.
ADVANCED FUNCTIONAL MATERIALS
(2021)
Article
Nanoscience & Nanotechnology
Ruiji Sun, Wangsheng Jiang, Song Wang, Wenjing Cui, Lihong Qi, Kai Pan
Summary: Lead-free double-perovskite nanocrystals with metal ion alloying show improved optical properties and longer exciton lifetime compared to lead-based perovskite nanocrystals. Cs2Ag0.64K0.36BiBr6 nanocrystals exhibit higher photoluminescence quantum yield and extended exciton lifetime, making them promising for application in light-emitting diodes.
ACS APPLIED NANO MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Song Wang, Wangsheng Jiang, Wenjing Cui, Wenchao Jiang, Min Zhao, Jianhui Sun, Binghang Liu, Xiaofeng Lai, Keying Shi, Kai Pan
Summary: Na+-doped Cs2AgBiBr6 NCs with monodisperse cubic morphology and homogeneous structure are prepared by a colloidal synthesis strategy. The doping of Na+ breaks the inversion-symmetry-induced parity-forbidden transition, changing the wave function parity of self-trapped excitons and leading to a higher PLQY (9.08%) and longer exciton lifetime (17.15 ns) compared to Cs2AgBiBr6 NCs. Moreover, Na+ doping elevates the optical phonon energy and exciton binding energy, resulting in improved thermal stability and potential applications in optoelectronic devices.
ADVANCED OPTICAL MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Jung-Yao Chen, Dong-Lin Yang, Fu-Cheng Jhuang, Yu-Han Fang, Jean-Sebastien Benas, Fang-Cheng Liang, Chi-Ching Kuo
Summary: Emulation of photonic synapses through photo-recordable devices has attracted attention for their low energy consumption and high parallelism in artificial neuromorphic networks. This study explored the impact of perovskite quantum dots on the photoresponsive characteristics of photomemory, demonstrating that quantum dots with the lowest valence band maximum and longest exciton lifetime show superior performance in terms of responsiveness and current ratios.
ADVANCED FUNCTIONAL MATERIALS
(2021)
Article
Chemistry, Physical
Razi Ahmad, Gautam Virender Nutan, Dinesh Singh, Govind Gupta, Udit Soni, Sameer Sapra, Ritu Srivastava
Summary: A strategy was proposed for the synthesis and purification of Cs2AgBiBr6 double perovskite nanocrystals, which remained stable even after washing with a polar solvent. The chemical and colloidal stability of Cs2AgBiBr6 was significantly improved by the efficient colloidal route involving stable precursors. Additionally, a compact and crack-free thin film of Cs2AgBiBr6 nanocrystals was successfully fabricated using a layer-by-layer solid-state ligand exchange technique, and perovskite solar cells were fabricated and tested.
Article
Chemistry, Physical
Wenjin Yu, Yu Zou, Hantao Wang, Bo Qu, Zhijian Chen, Lixin Xiao
Summary: The toxicity of lead-based halide perovskites limits their wide application in optoelectronics. The lead-free perovskite Cs2AgBiBr6 is a promising candidate due to its long carrier lifetime and outstanding stability. However, its large bandgap hinders absorption in the visible region, limiting its photoelectric properties. By facile elemental doping or substitution, Cs2AgBiBr6 can potentially be used in both visible and near-infrared regions. Band-edge adjustment or deep-energy-level doping can expand its absorption range, making it suitable for solar cells and photodetector applications.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2023)
Article
Nanoscience & Nanotechnology
Bingyue Li, Hui Li, Yanhui Sun, Mark G. Humphrey, Chi Zhang, Zhipeng Huang
Summary: This study reports the nonlinear optical properties of lead-free Cs2AgBiBr6 perovskite. Pristine Cs2AgBiBr6 thin film exhibits strong reverse saturable absorption (RSA), while Cs2AgBiBr6 thin film with defects (denoted as Cs2AgBiBr6(D)) shows saturable absorption (SA). The nonlinear absorption coefficients for Cs2AgBiBr6 are ca. 4.0 x 104 cm GW-1 (515 nm laser excitation) and 2.6 x 104 cm GW-1 (800 nm laser excitation), while for Cs2AgBiBr6(D) they are -2.0 x 104 cm GW-1 (515 nm laser excitation) and -7.1 x 103 cm GW-1 (800 nm laser excitation). The optical limiting threshold of Cs2AgBiBr6 is 8.1 x 10-4 J cm-2 (515 nm laser excitation). The samples show excellent long-term performance stability in air. The RSA of pristine Cs2AgBiBr6 correlates with excited-state absorption (515 nm laser excitation) and excited-state absorption following two-photon absorption (800 nm laser excitation), while the defects in Cs2AgBiBr6(D) strengthen the ground-state depletion and Pauli blocking, resulting in SA.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Chemistry, Physical
Yalan She, Zhufeng Hou, Oleg Prezhdo, Wei Li
Summary: Pb-free double perovskites like Cs2AgBiBr6 have negatively charged Br vacancies that create detrimental defects, while substituting Ag with indium can mitigate hole trapping and trap-assisted charge recombination, thus improving the performance of optoelectronic devices.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2021)
Article
Engineering, Electrical & Electronic
Ming-Yun Liao, Mohamed Hammad Elsayed, Chih-Li Chang, Yun-Chi Chiang, Wen-Ya Lee, Wen-Chang Chen, Ho-Hsiu Chou, Chu-Chen Chueh
Summary: This study explores the potential applications of photoactive polymer dots in energy conservation and renewable fuel industry, and proposes their innovative use in photomemory applications for the first time. The research reveals that the photomemory characteristics can be simply tuned by changing the core conjugated structures of Pdots, and inserting Pt complexes into polymer backbones to form cycloplatinated Pdots can convert the storage type of derived devices from volatile memory to nonvolatile flash memory.
ACS APPLIED ELECTRONIC MATERIALS
(2021)
Article
Energy & Fuels
Wolfgang Tress, Maximilian T. Sirtl
Summary: Cs2AgBiBr6 double perovskites show high potential in solar cells, but major changes in absorption onset are needed to achieve higher efficiency. This material poses various scientific questions, and exact recombination and charge transport processes are yet to be unraveled, preparing us for the development of double perovskite or perovskite-like materials.
Article
Materials Science, Multidisciplinary
Zihong Shen, Zunxian Yang, Yuanqing Zhou, Yuliang Ye, Bingqing Ye, Qiaocan Huang, Wenbo Wu, Hongyi Hong, Zeqian Hong, Zongyi Meng, Zhiwei Zeng, Songwei Ye, Zhiming Cheng, Qianting Lan, Jiaxiang Wang, Ye Chen, Hui Zhang, Tailiang Guo, Yun Ye, Zhenzhen Weng, Yongyi Chen
Summary: Artificial photonic synapses, with their high sensitivity and low power consumption, have been developed as new sensors for the IoT and ANNs. This study successfully fabricates photonic synaptic transistors using ternary organic array films, which exhibit both short-term and long-term plasticity. The low power consumption and wireless optical communication capabilities make these synapses highly valuable for next-generation human-computer interaction sensors.
JOURNAL OF MATERIALS CHEMISTRY C
(2023)
Article
Engineering, Electrical & Electronic
Aochen Du, Wenxiao Zhao, Yun Ye, Enguo Chen, Sheng Xu, Tailiang Guo
Summary: In this paper, Cs(Pb,Sb)Br-3 PQDs@glasses were successfully prepared by traditional methods. The optical characterization showed that Cs(Pb0.7Sb0.3)Br-3 PQDs@glasses have a emission peak at 518 nm and a full width at half maximum of 20 nm, with a photoluminescence quantum yield (PLQY) of 58%. The stability and potential applications of the PQDs@glass were further studied through thermal analysis and combining with ceramic phosphors.
JOURNAL OF THE SOCIETY FOR INFORMATION DISPLAY
(2023)
Article
Chemistry, Multidisciplinary
Wen-Wen Wang, Yu-Yan Peng, Xu-Yang Weng, Yan-Qiao Jin, Xiong-Tu Zhou, Qun Yan, Tai-Liang Guo, Chao-Xing Wu, Yong-Ai Zhang
Summary: Glasses-free 3D displays are considered to be the future of the display industry. A flexible liquid crystal micro-lens array (LC MLAs) on a curved PET substrate was developed. An integral imaging-based 2D/3D convertible display system was proposed using the flexible LC MLAs to switch between 2D and 3D modes. The system works in 3D mode when the FLC MLAs have an applied voltage and in 2D mode when the voltage is absent.
Article
Chemistry, Physical
Gengxu Chen, Xipeng Yu, Changsong Gao, Yan Dai, Yanxue Hao, Rengjian Yu, Huipeng Chen, Tailiang Guo
Summary: This study focuses on the multi-sensory neuromorphic computing system and presents a temperature-dependent memory/synaptic hybrid artificial neuromorphic device based on floating gate phototransistors. The device can switch between nonvolatile memory and volatile synaptic behavior at different temperatures, which promotes the expansion of the sensory range of multi-sensory devices.
Article
Chemistry, Physical
Wenjie Lu, Qizhen Chen, Huaan Zeng, Hui Wang, Lujian Liu, Tailiang Guo, Huipeng Chen, Rui Wang
Summary: An all-optical synaptic device based on a long-afterglow material is reported, which has optical properties similar to biological synapses. Combining the focusing characteristics of a convex lens, the optical summation of all-optical synaptic array pixels can be completed to transmit preprocessed multiple input signals. This work enriches the variety of artificial synapses and demonstrates the great development potential of photoelectric artificial neural networks.
Correction
Engineering, Electrical & Electronic
Xiang Zhang, Anlan Chen, Tao Yang, Junhu Cai, Yuanyuan Ye, Enguo Chen, Sheng Xu, Yun Ye, Jie Sun, Qun Yan, Tailiang Guo
IEEE PHOTONICS JOURNAL
(2023)
Article
Multidisciplinary Sciences
Liuting Shan, Qizhen Chen, Rengjian Yu, Changsong Gao, Lujian Liu, Tailiang Guo, Huipeng Chen
Summary: This study proposes an efficient sensory memory processing system that can process sensory information and generate synapse-like and multiwavelength light-emitting output for efficient multimodal information recognition. The system exhibits strong robustness in information encoding/transmission and the capability of visible information display through the multi-level color responses, which can implement the multi-level pain warning process of organisms intuitively.
NATURE COMMUNICATIONS
(2023)
Article
Chemistry, Physical
Wandi Chen, Wenwen Wang, Shiyao Li, Jiaxin Kang, Yongai Zhang, Qun Yan, Tailiang Guo, Xiongtu Zhou, Chaoxing Wu
Summary: Liquid crystal (LC) is an intermediate state compound with both the anisotropy of crystal molecules and the fluidity of liquid, making it a cutting-edge technology in optoelectronics. The need for a safe and portable low-power device is evident, given the requirement for larger voltages and the safety concerns associated with large-aperture LC lens. This paper proposes a Feather TENG (F-TENG) that utilizes feathers as friction materials to harvest mechanical energy and power experimental test equipment, offering a simple and affordable method for the practical application of TENG systems.
Article
Nanoscience & Nanotechnology
Haobing Zhao, Hailong Hu, Jinping Zheng, Yuan Qie, Kuibao Yu, Yangbin Zhu, Zhiqi Luo, Lihua Lin, Kaiyu Yang, Tailiang Guo, Fushan Li
Summary: By using a safe phosphorus source, narrow bandwidth InP/ZnSeS/ZnS quantum dots with high photoluminescence quantum yield and narrow emission spectrum were synthesized, showing potential applications in high-performance display devices.
ACS APPLIED NANO MATERIALS
(2023)
Article
Nanoscience & Nanotechnology
Songman Ju, Chaomin Mao, Jinping Zheng, Kaiyu Yang, Lihua Lin, Tailiang Guo, Hailong Hu, Fushan Li
Summary: This work proposes a new strategy to enhance the electroluminescent performance of perovskite quantum dots (PQDs) by creating a PQD film. By manipulating the ion distribution and trap density in the PQD film through varying pre-bias voltage and time, the device's capacitance value and luminous efficiency can be modified. The external quantum efficiency of the device increased from 2.81% to 7.95% through this strategy. This research provides a new approach for achieving perovskite quantum dot light-emitting devices with high luminous efficiency.
ACS APPLIED NANO MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Yuanqing Zhou, Zunxian Yang, Qiaocan Huang, Yuliang Ye, Bingqing Ye, Zihong Shen, Wenbo Wu, Zhiwei Zeng, Zongyi Meng, Hongyi Hong, Songwei Ye, Zhiming Cheng, Qianting Lan, Jiaxiang Wang, Ye Chen, Hui Zhang, Tailiang Guo, Fushan Li, Yongyi Chen, Zhenzhen Weng
Summary: Metal halide perovskite quantum dots (QDs) show promise for LED applications due to their excellent optical properties. However, the instability of traditional ligands affects the surface properties, and their insulating nature hinders practical use in electroluminescent devices. In this study, a dual-function ligand DDA-MeS was used to passivate surface defects and stabilize chelation on QDs surface. As a result, the performance of green QDs-LED devices was greatly improved with enhanced external quantum efficiency, maximum brightness, and reduced turn-on voltage. This work introduces a novel approach for developing highly efficient and bright green LED devices using dual-function ligands.
Proceedings Paper
Optics
Zhenyu Zeng, Hongxing Xie, Yaqian Zheng, Sijie Li, Yun Ye, TaiLiang Guo
Summary: In this study, quantum dots were added into masterbatches to prepare composite components with diffusion and color conversion functions. The resulting QD color masterbatch exhibited uniform dispersion, controllable concentration, and good luminescence performance. This study demonstrates the potential application of QD masterbatches in high-performance QD display devices.
OPTICAL DESIGN AND TESTING XII
(2023)
Proceedings Paper
Optics
Wenyan Zhang, Xinpei Hu, Yu Chen, Zibin Lin, Enguo Chen, Yun Ye, Sheng Xu, Tailiang Guo
Summary: This study designs and optimizes quantum-dot color conversion films (QDCCFs) with non-uniform thickness to solve the luminance uniformity issue when Mini-LED backlight is combined with quantum-dot color conversion (QDCC) technology. By simulation, it is found that the optimized cone and circular truncated cone structures can achieve illuminance uniformity of 73.97% and 74.72%, respectively, compared to only 35.84% in the uniform thickness structure. Furthermore, by combining the non-uniform thickness structure with a basic substrate and optimizing the array configuration, the illuminance uniformity of the backlight can reach 73.55% and 79.25%. This work presents a new strategy for achieving uniform color conversion in Mini-LED display backlights.
OPTICAL DESIGN AND TESTING XII
(2023)
Proceedings Paper
Optics
Shuai Zhu, Xiaojian Zhou, Sheng Xu, Enguo Chen, Yun Ye, Qun Yan, Tailiang Guo
Summary: This work proposes a research scheme to speed up the design of metasurface skin cloak through low-complexity phase monitoring model and deep learning. This skin cloak conceals a three-dimensional arbitrarily shaped object by complete restoration of the phase of the reflected light at specific wavelength. The possibility of realizing spectral prediction by deep learning is analyzed.
OPTICAL DESIGN AND TESTING XII
(2023)
Article
Optics
Liu Lan, Ye Yun, Guo Tailiang
Summary: This paper proposes a detection method for OLED pixel defects based on an extended FPN. By extending the FPN, regional details at different levels of the hierarchy are effectively obtained, and the semantic information from higher levels is integrated in a pyramidal manner to enrich the underlying features and enhance the contrast of details, thereby achieving more accurate detection of OLED pixel defects.
ACTA OPTICA SINICA
(2023)