Article
Electrochemistry
E. R. Henquin
Summary: This article develops a simplified model to analyze the influence of leakage current on the electrode current distribution in a reactor with n bipolar electrodes. Multiple models are studied to analyze the current that flows perpendicular to the electrodes and finally becomes parasitic current, taking into account two reaction kinetics: Tafel and Butler-Volmer. The effectiveness of the model is validated through the comparison of experimental data and predictions. Furthermore, this work is of great importance for the study and design of electrochemical reactors used in the production of green hydrogen.
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
(2023)
Article
Materials Science, Multidisciplinary
Chaomin Mao, Songman Ju, Jinping Zheng, Yueting Zheng, Zhongwei Xu, Lihua Lin, Hailong Hu, Kaiyu Yang, Tailiang Guo, Fushan Li
Summary: This study fabricates high-resolution perovskite quantum dot LEDs (PQLEDs) using nanoimprint technique, which can achieve massive pixel density displays with high color purity, efficiency, and wide color gamut.
ADVANCED OPTICAL MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Xiangyu Fu, Yash Mehta, Yi-An Chen, Lei Lei, Liping Zhu, Nilesh Barange, Qi Dong, Shichen Yin, Juliana Mendes, Siliang He, Renuka Gogusetti, Chih-Hao Chang, Franky So
Summary: The study demonstrates highly directional and polarized light emission from LEDs by selectively diffracting the TE waveguide mode, showing potential for more efficient photonic applications.
ADVANCED MATERIALS
(2021)
Article
Engineering, Electrical & Electronic
Yangfeng Li, Rong Yang, Yang Jiang, Haiqiang Jia, Wenxin Wang, Hong Chen
Summary: In this study, we propose a facile and compatible method to reduce the leakage current in InGaN LEDs by inserting an AlGaN interlayer before the growth of n-GaN. The results show that the leakage current is significantly decreased by 37% compared to LEDs without the AlGaN interlayer, while other electronic properties remain unchanged. The AlGaN interlayer effectively blocks the propagation of threading dislocations, contributing to the reduction of leakage current.
IEEE ELECTRON DEVICE LETTERS
(2023)
Article
Multidisciplinary Sciences
Jin-Hoon Kim, Jin-Woo Park
Summary: An intrinsically stretchable organic light-emitting diode, made of highly stretchable constituent materials, is able to emit light under strains as large as 80%. It has a low turn-on voltage of 8 V and a maximum luminance of 4400 cd m(-2) from both the anode and cathode sides. The device can withstand repeated stretching cycles up to 200 times and shows improved light-emitting efficiency with small stretches up to 50%.
Article
Computer Science, Information Systems
Kook Chul Moon, Jie Wang, Cui-Li Gai, Jun-Feng Li, Keechan Park
Summary: This study investigates the increase in brightness of a low-temperature polycrystalline silicon and metal-oxide (LTPO) active-matrix organic light-emitting diode (AMOLED) display under low-refresh-rate driving condition, even in the absence of a critical leakage current path from the storage capacitor. The main cause of this brightness increase is attributed to electron trapping in the gate insulator of the driving thin-film transistor (DTFT) operating in the saturation mode prone to hot carrier injection. To address this issue, a novel driving method is proposed, which applies a high voltage to the source and drain of the DTFT during the non-emitting time for dimming the organic light-emitting diode (OLED) display. Experimental results demonstrate that the proposed DTFT reset scheme reduces the brightness variation from 3.7% to 1.4% at the 63rd gray level.
Article
Materials Science, Multidisciplinary
Yong-Ho Ra, Cheul-Ro Lee
Summary: A new approach to reduce the size of photonic device chips is reported, utilizing a monolithic light reflector-nanowire LED system. Vertical cavity nanowire structure for surface-lighting emission is developed using selective area epitaxy, with the light reflection provided by Al metal reflector deposited by MBE technique. The approach shows significantly improved light efficiency at specific spectral wavelength, promising a new route for next-generation photonic and electronic devices.
ADVANCED MATERIALS TECHNOLOGIES
(2021)
Article
Materials Science, Multidisciplinary
You Na Song, Sunwoo Kang, Taekyung Kim
Summary: This study introduces the concept of an electron leakage-pathway (ELP) and demonstrates that using an anthracene core with high bond dissociation energy (BDE) as the ELP is the most effective way to increase the lifetime of blue fluorescent organic light-emitting diodes (FOLEDs), achieving over 400 h of LT90. Furthermore, under a commonly used brightness level, an LT50 of over 10,000 h was obtained.
ADVANCED OPTICAL MATERIALS
(2023)
Article
Chemistry, Physical
Lianna Chen, Zhiyuan Qin, Shuming Chen
Summary: In this study, a new method has been developed to achieve high-resolution pixelated emission by controlling the thickness of transparent electrodes, resulting in a color-converting cavity that can selectively convert unpatterned quantum-dot white emission into saturated red, green, and blue emission. This method enables ultrahigh density red, green, and blue emission with a resolution of approximately 1700 pixels per inch, as well as achieving a color gamut of 111% NTSC.
Article
Chemistry, Physical
Xinsu Zhang, Zhibin Zhang, Yixuan Liu, Shuangshuang Shi, Yuan Zhang, Yue Cao, Lingling Li, Chong Geng, Yuanqin Xia, Junjie Zhu, Shu Xu
Summary: A NC-NC Förster resonance energy transfer (FRET) system was developed in semiconductor nanocrystals, utilizing CsPbBr3 NCs as donors and CdSe/CdS NCs as acceptors. The system showed significant reductions in integrated photoluminescence intensity in toluene and octadecene solvents, with a Dexter energy transfer process leading to additional PL enhancement. This proposed system demonstrates improved lightconversion efficiency and anti-quenching properties, making it superior in light down-conversion applications.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2021)
Review
Chemistry, Physical
Taesoo Lee, Minhyung Lee, Hansol Seo, Minjun Kim, Beomsoo Chun, Jeonghun Kwak
Summary: This review summarizes previous studies on top-emitting device structures and discusses ways to improve the performance of top-emitting quantum dot-based light-emitting diodes (TQLEDs). The relevant theories for the optoelectrical properties of TQLEDs are introduced, and advancements in device optimization are presented. Multilateral strategies for TQLEDs to be widely applied in advanced industries are also discussed. This review aims to provide valuable insights for realizing commercial TQLEDs applicable to a broad range of applications.
Review
Materials Science, Multidisciplinary
Deying Kong, Kaiyuan Zhang, Jingjing Tian, Lan Yin, Xing Sheng
Summary: This article provides an overview of recent progress in the development of biocompatible and biodegradable light-emitting materials and devices, including molecular dyes, proteins, and inorganic particles with photoluminescence, material systems with unusual optical properties, and electroluminescent materials and devices with potential for full biodegradation. These advancements are envisioned to offer unique capabilities for a wide range of biomedical applications, from biological sensing and modulation to clinical diagnostics and therapy.
ADVANCED MATERIALS TECHNOLOGIES
(2022)
Article
Physics, Applied
C. Symonds, V. Toanen, A. Gassenq, J. -m. Benoit, A. Pereira, E. Cleyet-Merle, R. Fulcrand, F. Bessueille, S. Minot, M. Morassi, A. Lemaitre, J. Bellessa
Summary: This Letter presents a fabrication process for current injection into micrometer-size Ag/GaAs Tamm emitting diodes with special care to avoid surface damages. Electroluminescence from GaAs quantum wells is demonstrated at room temperature, showing dispersion following the Tamm mode. Additionally, for small diameters Tamm structures, electroluminescence occurs in discretized energy modes due to in-plane confinement. This observation of electrically excited emission from a confined diode is a significant advancement towards Tamm plasmon optical devices with novel functionalities.
APPLIED PHYSICS LETTERS
(2023)
Article
Chemistry, Multidisciplinary
Gyu Don Kong, Seo Eun Byeon, Jiung Jang, Jeong Won Kim, Hyo Jae Yoon
Summary: This study describes polarity inversion in molecular rectification and its mechanism. By using a supramolecular engineered self-assembled monolayer, researchers observed a rectification ratio-voltage relationship over a wide voltage range and discovered polarity inversion. The findings suggest that the wide voltage range allows access to molecular orbital energy levels, resulting in polarity inversion.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2022)
Article
Chemistry, Multidisciplinary
Kunsik An, Chaewon Kim, Sunkuk Kim, Taesoo Lee, Dongyeol Shin, Jaemin Lim, Donghyo Hahm, Wan Ki Bae, Jun Young Kim, Jeonghun Kwak, Jaehoon Kim, Kyung-Tae Kang
Summary: This paper presents a novel light extraction structure called RaDiNa, which enhances the light extraction capability of top-emitting quantum dot light-emitting diodes (TE-QLEDs). By detaching a polydimethylsiloxane (PDMS) film from a ZnO nanorod (ZnO NR) layer and laying it on top of the TE-QLED, the RaDiNa-attached TE-QLED achieves significantly improved external quantum efficiency (EQE) compared to the reference device. This study provides essential information for the commercialization of TE-QLEDs.
Article
Materials Science, Multidisciplinary
Lucia Martinez-Goyeneche, Lidon Gil-Escrig, Daniel Tordera, Cristina Roldan-Carmona, Henk J. J. Bolink, Michele Sessolo
Summary: The research team developed a photodetector that can operate in broadband and narrowband modes depending on the illumination side. By depositing a low bandgap perovskite material on a transparent substrate, broadband response is achieved when illuminated from the bottom, while narrowband response is obtained when light is shined through the top perovskite based on the energy difference of the two perovskites. This study is significant for color discrimination and selective wavelength photodetection in imaging applications.
JOURNAL OF MATERIALS CHEMISTRY C
(2023)
Article
Energy & Fuels
Anderzon F. Palechor-Ocampo, Jorge Caram, Pedro Hierrezuelo-Cardet, Federico Ventosinos, Daniel Perez-del-Rey, Henk J. Bolink, Javier A. Schmidt
Summary: This study characterized the film of CH3NH3PbI3 deposited by thermal sublimation on different substrates using time-dependent photoconductivity measurements. The experimental results showed that the substrate had a significant effect on the behavior of the perovskite, and the photoconductivity was sensitive enough to probe these effects. Furthermore, a theoretical explanation based on the Shockley-Read-Hall statistics model was proposed, which explained the different photoconductivity responses by changing the relative values of the capture coefficients and the position of the Fermi level. It was suggested that the substrate changed the stoichiometry of the evaporated material, affecting the transient photoconductivity response.
Article
Energy & Fuels
Kassio P. S. Zanoni, Lucia Martinez-Goyeneche, Chris Dreessen, Michele Sessolo, Henk J. Bolink
Summary: To ensure reproducibility in perovskite photovoltaics, the sublimation control of organic ammonium halides is crucial. This study presents a reproducible procedure for the coevaporation of PbI2 and MAI using an evaporator chamber setup with two quartz crystal microbalances. The MAPbI(3)-QCM is used to indirectly monitor the MAI evaporation, avoiding fluctuating sublimation rates caused by variations in MAI purity, resulting in consistently high-performing solar cells over a period of one and a half years.
Article
Chemistry, Multidisciplinary
Tatiana Soto-Montero, Suzana Kralj, Wiria Soltanpoor, Junia S. Solomon, Jennifer S. Gomez, Kassio P. S. Zanoni, Abhyuday Paliwal, Henk J. Bolink, Christoph Baeumer, Arno P. M. Kentgens, Monica Morales-Masis
Summary: Vapor deposition shows great potential for scalable and industrial processing of perovskite solar cells, offering advantages such as toxicity-free processing, thickness control, and uniform coating. However, the different volatilities of the organic and inorganic components of perovskites currently require multiple thermal sources or two-step deposition. In this study, single-source, single-step pulsed laser deposition is demonstrated for the deposition of tunable MA(1-x)FA(x)PbI(3) thin films. The room temperature formation of cubic alpha-phase MA(1-x)FA(x)PbI(3) films is achieved by controlling laser ablation of a solid target with adjustable ratios of MAI:FAI:PbI2. The target-to-film transfer of the ablated species is confirmed, and proof-of-concept solar cells with 14% efficiency are demonstrated. This research paves the way for future developments in industry-compatible vapor deposition methods for perovskite solar cells.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Bas A. H. Huisman, Henk J. Bolink
Summary: An easy process to fabricate highly luminescent and color-pure polymer-encapsulated halide perovskite color converters is reported. By adjusting the weight percentage of the perovskite in the polymer, the disk can be opaque or transmissive. The disks are stable in air for over 2 months and white light can be obtained by illuminating it with a blue light source by inserting a secondary emitter.
ADVANCED OPTICAL MATERIALS
(2023)
Article
Nanoscience & Nanotechnology
Kassio P. S. Zanoni, Daniel Perez-del-Rey, Chris Dreessen, Nathan Rodkey, Michele Sessolo, Wiria Soltanpoor, Monica Morales-Masis, Henk J. Bolink
Summary: This study investigates the application of SnO2-based electron transport layers (ETL) in perovskite solar cells (PSCs). It is found that by controlling the deposition parameters of pulsed laser deposition (PLD) technique, SnO2 films with low roughness can be obtained. The concentration of oxygen in the background gas is also shown to affect the number of oxygen vacancies in the film. Solar cells with methyl-ammonium lead iodide perovskite absorber layer and SnO2 ETL deposited by PLD under optimized conditions achieve power conversion efficiencies exceeding 18%, comparable to those with atomic layer deposited SnO2 ETL.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Chemistry, Multidisciplinary
Enrique Hernandez-Balaguera, Juan Bisquert
Summary: Metal halide perovskites are promising materials for optoelectronic applications. This study analyzes the relevant physics of optoelectronic devices, focusing on the kinetic delay introduced by ionic mechanisms. A dynamical model is developed to describe the complex multiscale dynamics in halide perovskite semiconductors, explaining the structure of current transient responses. The proposed methodology provides a suitable connection between impedance and chronoamperometric experiments, identifying characteristic parameters of transient dynamics in metal halide perovskites.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Bas A. H. Huisman, Camilla Bordoni, Andrea Ciavatti, Michele Sessolo, Beatrice Fraboni, Henk J. Bolink
Summary: This paper describes a simple and solvent-free method to fabricate polymer-encapsulated halide perovskite photoconductors. The CsPbBr3 is prepared using a dry mechanochemical synthesis in the presence of poly(butyl methacrylate) (PBMA). The resulting composite powder is then heated and pressed into a free-standing disk, which can be laminated on a glass substrate with interdigitated electrodes to form a planar photoconductor device. The best photoconductive performance is achieved with disks containing 75 wt.% CsPbBr3 in PBMA, reaching a detectivity of & AP;2 x 1011 Jones. Narrowband detectors can be obtained by adjusting the disk thickness. The disks also show potential as absorber materials for X-ray detectors, with low detection limit, fast and linear response.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Chemistry, Physical
Juan Bisquert, Cedric Gonzales, Antonio Guerrero
Summary: Solution-processed photodetectors based on halide perovskite semiconductors have attractive properties for applications in lightweight, transparent, flexible, and spectrally selective optical sensors. In this study, the characteristic response of a halide perovskite photodetector was measured and a new model was established to analyze the dominant transient shapes. The model incorporates the basic principles of charge generation, collection, and polarization, as well as a delayed photocurrent mode caused by ionic-electronic interaction phenomena.
JOURNAL OF PHYSICAL CHEMISTRY C
(2023)
Article
Chemistry, Physical
Juan Bisquert
Summary: Brain-inspired neuromorphic computing, which focuses on the development of artificial neurons and synapses, is an important area of research for effective artificial intelligence systems. This study proposes a minimal configuration for an iontronic spiking neuron based on a conical nanofluidic pore ionic diode, providing an effective approach for creating efficient neuromorphic networks.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2023)
Article
Chemistry, Physical
Joost W. C. Reinders, Cristina Roldan-Carmona, Henk J. Bolink, Francisco Palazon
Summary: This study reports on the fabrication of Mg(3)Bi(2) thin films under Mg-rich and Mg-poor conditions and demonstrates that Mg-deficient films show p-type conduction behavior with high power factor and thermoelectric figure of merit, while increasing the amount of Mg enables the formation of Mg-rich Mg3Bi2 films with n-type conduction and higher power factor and thermoelectric figure of merit at lower temperatures.
ACS APPLIED ENERGY MATERIALS
(2023)
Article
Engineering, Electrical & Electronic
Enrique Hernandez-Balaguera, Laura Munoz-Diaz, Agustin Bou, Beatriz Romero, Baurzhan Ilyassov, Antonio Guerrero, Juan Bisquert
Summary: In this study, we propose a detailed interpretation of the temporal dynamics of potentiation in perovskite memristors, which can be validated by impedance spectroscopy. We demonstrate that the accumulation of mobile ions and their penetration into the charge-transport layers constitute a bioelectrical memory feature that is essential for long-term synaptic enhancement. Our work opens up new possibilities for material mimicking of neural communications across synapses.
NEUROMORPHIC COMPUTING AND ENGINEERING
(2023)
Article
Chemistry, Physical
Juan Bisquert
Summary: Hysteresis effects in ionic-electronic devices can be used to develop switching memory devices for information storage and brain-like computation. Halide perovskite devices exhibit frequent hysteresis in current-voltage curves, which can be utilized to build effective memristors. These phenomena can be described by nonlinear differential equations involving current, voltage, and internal state variables similar to the Hodgkin-Huxley model for action potentials in neurons. Furthermore, introducing a capacitive coupling in the slow relaxation variable extends the neuron-style models to explain observations in impedance spectroscopy of MAPbBr solar cells and memristors.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2023)
Letter
Materials Science, Multidisciplinary
Oleksandr Stroyuk, Oleksandra Raievska, Paz Sebastia-Luna, Bas A. H. Huisman, Christian Kupfer, Anastasia Barabash, Jens Hauch, Henk J. Bolink, Christoph J. Brabec
Summary: The thermal deposition of lead-free double perovskites for transparent thin films is challenging due to the need to balance the evaporation dynamics of multiple metal halide sources or synthesize a single-phase precursor. This study demonstrates the feasibility of single-source vacuum deposition to produce transparent nanocrystalline films of microcrystalline Cs2AgxNa1-xBiyIn1-yCl6 double perovskites while maintaining their bulk spectral and structural properties. The perovskite films derived from the most emissive powders exhibited a photoluminescence quantum yield of 85%, indicating the promising use of thermal evaporation for perovskite-based optical materials.
ACS MATERIALS LETTERS
(2023)
Review
Chemistry, Physical
Juan Bisquert
Summary: This paper discusses the properties of neurons in different material substrates and proposes a method for building brain-inspired artificial systems. By studying the material and device characteristics, it is possible to generate dynamic properties similar to biological neurons, thereby achieving enhanced information processing and learning capabilities.
CHEMICAL PHYSICS REVIEWS
(2023)
Article
Materials Science, Multidisciplinary
Honggyun Kim, Jamal Aziz, Vijay D. Chavan, Deok-kee Kim
Summary: Silicon nitride films were prepared using plasma enhanced chemical vapor deposition with different trap densities induced by adjusting the RF power ratio. It was found that the film's trap density was lowest under compressive stress and increased under tensile stress. This study has significant implications for the formation of durable nitride films in various electronic and optoelectronic applications.
CURRENT APPLIED PHYSICS
(2024)
Article
Materials Science, Multidisciplinary
Qiang Yu, Huwei Zhao, Yue Zhao
Summary: Zinc oxide thin films and Al-doped zinc oxide films were prepared and characterized in this study. The addition of Al ions was found to change the growth orientation, increase the grain size, and enhance the absorption intensity in the visible light region. Furthermore, the addition of Al ions also increased the forward current in the heterojunction.
CURRENT APPLIED PHYSICS
(2024)
Article
Materials Science, Multidisciplinary
Sang Woo Lee, Min Sun Park, Sangwon Wi, So Yeon Lim, Yeseul Lee, Jin-Seok Chung, Sang Mo Yang
Summary: In this study, we investigated the dynamics of domain switching in pristine and fatigued BiFeO3 capacitors through experimental observations and measurements. The results showed that the switching in the pristine capacitors was dominantly driven by domain growth, while the fatigued capacitors exhibited two different switching dynamics, in which nucleation played a critical role.
CURRENT APPLIED PHYSICS
(2024)
Article
Materials Science, Multidisciplinary
Boshi Wang, Tianyi Wang, Yufang Liu, Kun Yu
Summary: In this paper, a tunable and anisotropic perfect absorber composed of anisotropic black phosphorus (BP) and isotropic graphene is proposed. The structure exhibits high absorption and strong anisotropic plasma response. The resonance characteristics can be effectively controlled by adjusting geometric parameters and doping levels, offering potential applications.
CURRENT APPLIED PHYSICS
(2024)
Article
Materials Science, Multidisciplinary
Xiaolan Liu, Chunyang Li, Tonghui Yang, Naiqiang Yin, Gangling Zhao
Summary: Water drop triboelectric nanogenerators (WD-TENGs) can harvest energy from raindrops and improve the output performance of TENGs.
CURRENT APPLIED PHYSICS
(2024)
