Article
Multidisciplinary Sciences
Chiara Labanti, Jiaying Wu, Jisoo Shin, Saurav Limbu, Sungyoung Yun, Feifei Fang, Song Yi Park, Chul-Joon Heo, Younhee Lim, Taejin Choi, Hyeong-Ju Kim, Hyerim Hong, Byoungki Choi, Kyung-Bae Park, James R. Durrant, Ji-Seon Kim
Summary: This study investigates the light-intensity-dependent photoresponse time of organic photodetectors (OPDs) with two small-molecule donors co-evaporated with C-60 acceptors. The MPTA:C-60 blend shows the fastest response time at high-light intensities, but the slowest response at low-light intensities, potentially due to the presence of deep trap states. The disrupted molecular packing and HOMO level shift caused by C-60 contribute to the energetic inhomogeneity and limit the low-light photoresponse time.
NATURE COMMUNICATIONS
(2022)
Article
Engineering, Electrical & Electronic
J. Olea, G. Gonzalez-Diaz, D. Pastor, E. Garcia-Hemme, D. Caudevilla, S. Algaidy, F. Perez-Zenteno, S. Duarte-Cano, R. Garcia-Hernansanz, A. del Prado, E. San Andres, I Martil, Yao-Jen Lee, Tzu-Chieh Hong, Tien-Sheng Chao
Summary: Microwave annealing (MWA) processes were used for the first time to obtain Ti supersaturated Si. High Ti doses were ion implanted on Si substrates and subsequently MWA processed to recrystallize the amorphous layer. The resulting layers were monocrystalline with a high density of defects. Ti depth profiles indicate that diffusion is avoided once recrystallization is produced. Finally, the electronic transport properties measurements point to a decoupling effect between the Si:Ti layer and the substrate. The implanted layer present also a shallow donor and very high Hall mobility.
SEMICONDUCTOR SCIENCE AND TECHNOLOGY
(2023)
Article
Chemistry, Multidisciplinary
Yu Gao, Wenzhan Xu, Si-Wei Zhang, Tianjie Fan, Meng Zhang, Aihua Ran, Xuan Zhang, Feiyu Kang, Guodan Wei
Summary: This study successfully achieved efficient absorption of near-infrared light by using a high-efficiency perovskite/organic hybrid heterojunction solar cell, significantly improving the photocurrent density and conversion efficiency. Additionally, the stability of the perovskite was enhanced by the use of a ternary organic film.
Article
Engineering, Electrical & Electronic
Jiawei Fu, Jingkun Cong, Li Cheng, Deren Yang, Xuegong Yu
Summary: Developing a low-cost, room-temperature operated and CMOS compatible near infrared silicon photodetector is crucial for the advancement of all-silicon optoelectronic integrated circuits. In this study, a zinc-hyperdoped silicon-based photodetector with enhanced sub-bandgap photoresponse is presented, showing a wide range of infrared absorption. The Si:Zn photodetector demonstrates high responsivity, making it suitable for various applications due to its low cost, CMOS compatibility, and room-temperature operability.
SEMICONDUCTOR SCIENCE AND TECHNOLOGY
(2022)
Article
Computer Science, Information Systems
Yutaka Arima
Summary: This paper introduces a method to increase the sensitivity of a silicon near-infrared sensor by forming multiple trench-type photodiodes in a silicon chip. The device structure allows the depletion layer to spread over the entire sensor chip even at a bias voltage of 10 V or less, achieving a high conversion efficiency without cooling in silicon semiconductors. This method is expected to provide a low-cost and compact solution for various near-infrared receiver devices.
Article
Multidisciplinary Sciences
Wladislaw Michailow, Peter Spencer, Nikita W. Almond, Stephen J. Kindness, Robert Wallis, Thomas A. Mitchell, Riccardo Degl'Innocenti, Sergey A. Mikhailov, Harvey E. Beere, David A. Ritchie
Summary: The authors report a new phenomenon called the in-plane photoelectric effect, which exhibits a giant photoresponse at terahertz frequencies. This provides an opportunity for efficient direct detection across the entire terahertz range.
Article
Chemistry, Multidisciplinary
Mao Wang, Ye Yu, Slawomir Prucnal, Yonder Berencen, Mohd Saif Shaikh, Lars Rebohle, Muhammad Bilal Khan, Vitaly Zviagin, Rene Hubner, Alexej Pashkin, Artur Erbe, Yordan M. Georgiev, Marius Grundmann, Manfred Helm, Robert Kirchner, Shengqiang Zhou
Summary: The occurrence of mid-infrared localized surface plasmon resonances (LSPR) in thin Si films hyperdoped with tellurium (Te) is demonstrated in this study. By fabricating two-dimensional arrays of micrometer-sized antennas in a Te-hyperdoped Si chip, the mid-infrared LSPR can be further enhanced and extended to the far-infrared range. This finding opens up the possibility of integrating plasmonic sensors with the on-chip CMOS platform, greatly advancing the mass manufacturing potential of high-performance plasmonic sensing systems.
Article
Engineering, Electrical & Electronic
J. Olea, G. Gonzalez-Diaz, D. Pastor, E. Garcia-Hemme, D. Caudevilla, S. Algaidy, F. Perez-Zenteno, S. Duarte-Cano, R. Garcia-Hernansanz, A. del Prado, E. San Andres, I Martil
Summary: In this study, Si samples were implanted with high doses of Ti and processed using rapid thermal annealing (RTA) to recover crystal quality, with some samples processed by pulsed-laser melting for comparison. The electronic transport properties were measured at variable temperatures and analyzed. The results showed that the surface layers of RTA samples had negligible conductivity due to defects, while the implantation tail region had measurable conductivity due to high electron mobility. This region exhibited the activation of a very shallow donor and a deep donor level, with the suggestion that it originated from Ti-Si complexes. A decoupling effect between the implanted layer and the substrate was also observed, and a bilayer model was used to fit the measured properties.
SEMICONDUCTOR SCIENCE AND TECHNOLOGY
(2023)
Article
Multidisciplinary Sciences
Yibo Zhang, Sara Almenabawy, Nazir P. Kherani
Summary: By simulating the Haynes-Shockley experiment, we used a Schottky junction to adjust the electric field strength near the surface of the silicon material and observed the changes in photocarrier extraction. By modulating the work function of the indium tin oxide (ITO) material, we collected photocarriers at 0 V bias, thus avoiding the photocurrent gain effect. All experimental results showed an internal quantum efficiency of over 98% for broadband.
Article
Crystallography
Lingyan Du, Shiping Liu, Jie Yin, Shangzhen Pang, Hao Yi
Summary: Se-doped silicon films were fabricated using femtosecond and picosecond laser irradiation. Compared to femtosecond laser, picosecond laser processing produces higher quality and higher doping concentration materials, resulting in higher photocurrent response.
Article
Chemistry, Multidisciplinary
Liuchong Fu, Yuming He, Jiajia Zheng, Yuxuan Hu, Jiayou Xue, Sen Li, Ciyu Ge, Xuke Yang, Meng Peng, Kanghua Li, Xiangbin Zeng, Jinchao Wei, Ding-jiang Xue, Haisheng Song, Chao Chen, Jiang Tang
Summary: A low-cost, high-performance, and high-stability TexSe1-x short-wave infrared photodiode detector is reported, demonstrating the potential of direct integration on CMOS readout circuits. The device shows broad-spectrum response, high detectivity, wide bandwidth, and linear dynamic range, while achieving high electric and thermal stability. Material identification and masking imaging applications are demonstrated based on the optimized TexSe1-x photodiode detector.
ADVANCED MATERIALS
(2023)
Article
Chemistry, Analytical
Malgorzata Kopytko, Jan Sobieski, Waldemar Gawron, Piotr Martyniuk
Summary: Recently, there has been a trend in infrared technology towards achieving high operating temperature conditions for thermoelectric coolers. This is because there is a need to reduce the size, weight, and power dissipation of IR detectors. The paper discusses the potential application of specific materials and cooling techniques for the design of avalanche photodiodes operating in the infrared range, and compares the performance of different materials for this purpose.
Article
Optics
Junghyun Sung, Dongjin Shin, HyunHee Cho, Seong Won Lee, Seungmin Park, Young Duck Kim, Jong Sung Moon, Je-Hyung Kim, Su-Hyun Gong
Summary: In this study, indirect-bandgap transition lasing under continuous-wave excitation at room temperature is demonstrated in an ultra-thin WS2 disk. It is shown that a 50-nm-thick WS2 disk provides sufficient optical gain and whispering gallery modes for lasing action. These results offer a new direction for van-der-Waals-material-based nanophotonics and introduce the possibility for optical devices based on indirect-bandgap materials.
Article
Materials Science, Multidisciplinary
Jiaye Dai, Zichao Wang, Zhenzhen Wu, Ziyi Fang, Siyuan Heliu, Wei Tao Yang, Yang Bai, Xuan Zhang
Summary: Recently, researchers have been studying polymer materials with light-responsive shape memory and self-healing ability. This study introduces a new approach using poly(vinyl alcohol) (PVA) modified with pyrene groups as the polymer network and carbon nanotubes (CNTs) as the nanophotothermal agent to prepare a light-responsive shape memory material with fast photothermal responsiveness. The orderly dispersion of CNTs in the polymer matrix, facilitated by the stacking interaction between pyrene and CNTs, enhances the material's response capability and rate. The stacking and hydrogen bond interactions also contribute to the material's shape memory and self-healing ability.
ACS APPLIED POLYMER MATERIALS
(2023)
Article
Optics
Dekang Chen, Keye Sun, Yang Shen, Andrew H. Jones, Adam A. Dadey, Bingtian Guo, J. Andrew McArthur, Seth R. Bank, Joe C. Campbell
Summary: The frequency response of Al0.3InAsSb/Al0.7InAsSb nBn photodetectors is reported. It is found that the bandwidth of the photodetectors is limited by the diffusion capacitance, while the photocurrent has little effect on the bandwidth.
Article
Chemistry, Physical
Yan Jing, Eric M. Fell, Min Wu, Shijian Jin, Yunlong Ji, Daniel A. Pollack, Zhijiang Tang, Dian Ding, Meisam Bahari, Marc-Antoni Goulet, Tatsuhiro Tsukamoto, Roy G. Gordon, Michael J. Aziz
Summary: Researchers have found that the redox potentials of anthraquinone are influenced by three main factors: (1) electron-withdrawing end groups affecting AQs with two unsaturated hydrocarbons on the chains through pi-conjugation; (2) WSGs increasing the redox potentials of AQs with chains consisting of two (un)saturated straight hydrocarbons in the order PO32- < CO2- < SO3-; (3) AQs with (un)saturated chains at high pH possessing low redox potentials, high solubilities, and high stability.
ACS ENERGY LETTERS
(2022)
Article
Multidisciplinary Sciences
Shijian Jin, Min Wu, Yan Jing, Roy G. Gordon, Michael J. Aziz
Summary: This work presents a safe and scalable electrochemical method for CO2 separation with low energy cost. By utilizing proton-coupled electron transfer of DSPZ molecules, CO2 absorption and release can be achieved effectively. The results show promising potential for practical application in the future.
NATURE COMMUNICATIONS
(2022)
Article
Chemistry, Multidisciplinary
Yan Jing, Evan Wenbo Zhao, Marc-Antoni Goulet, Meisam Bahari, Eric M. Fell, Shijian Jin, Ali Davoodi, Erlendur Jonsson, Min Wu, Clare P. Grey, Roy G. Gordon, Michael J. Aziz
Summary: Aqueous organic redox flow batteries can achieve low-cost, long-lifetime energy storage by regenerating the original molecule, 2,6-dihydroxy-anthraquinone, without the need for further structural modifications.
Article
Electrochemistry
Kiana Amini, Eric M. Fell, Michael J. Aziz
Summary: We present a simple and inexpensive manual DC-offset method to extend the accepted voltage range of a battery cycler to negative voltages without interfering with the operation of the electrochemical cell under test or exceeding the voltage specifications of the instrument. The proposed setup is validated through short-term and long-term redox flow battery cycling, allowing the reversal of polarity required for various electrochemical cell operations.
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
(2022)
Article
Chemistry, Physical
Jinxu Gao, Kiana Amini, Thomas Y. George, Yan Jing, Tatsuhiro Tsukamoto, Dawei Xi, Roy G. Gordon, Michael J. Aziz
Summary: An iron complex with high redox potential and low capacity fade rate has been reported, demonstrating excellent cycling performance. The investigation provides unprecedented insights into the degradation mechanisms of the iron complex and guides further improvements for energy storage and conversion applications.
ADVANCED ENERGY MATERIALS
(2022)
Review
Chemistry, Physical
Michael J. Aziz, Dennice F. Gayme, Kathryn Johnson, Janelle Knox-Hayes, Perry Li, Eric Loth, Lucy Y. Pao, Donald R. Sadoway, Jessica Smith, Sonya Smith
Summary: The global growth of wind energy markets offers opportunities to reduce greenhouse gas emissions, but wind variability and community concerns need to be carefully addressed. A co-design approach that considers social, technical, economic, and political factors can help tackle the challenges associated with wind energy.
Article
Chemistry, Multidisciplinary
Kiana Amini, Emily F. Kerr, Thomas Y. George, Abdulrahman M. Alfaraidi, Yan Jing, Tatsuhiro Tsukamoto, Roy G. Gordon, Michael J. Aziz
Summary: In this study, a stable and energy-dense anthraquinone compound with 2-2-propionate ether anthraquinone structure was synthesized and evaluated for use in an aqueous redox flow battery. The compound showed high stability and minimal degradation when subjected to different conditions and rejuvenation strategies. Degradation mechanisms, including side chain loss and anthrone formation, were identified. This study introduces a promising negolyte candidate for grid-scale aqueous organic redox flow batteries.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Chemistry, Physical
Emily F. Kerr, Zhijiang Tang, Thomas Y. George, Shijian Jin, Eric M. Fell, Kiana Amini, Yan Jing, Min Wu, Roy G. Gordon, Michael J. Aziz
Summary: A new compound, 2,6-D2PEAQ, was synthesized and evaluated for its use in aqueous redox flow batteries. It demonstrated remarkable solubility and stability, with a high theoretical volumetric capacity for the negative electrolyte. Furthermore, it exhibited a lower fade rate compared to other water-soluble organic molecules and a greater volumetric capacity.
ACS ENERGY LETTERS
(2022)
Article
Electrochemistry
Brian H. Robb, Thomas Y. George, Casey M. Davis, Zhijiang Tang, Cy H. Fujimoto, Michael J. Aziz, Michael P. Marshak
Summary: Redox flow batteries (RFBs) with highly selective and conductive membranes can achieve long lifetimes and high performance. The use of a sulfonated Diels-Alder poly(phenylene) membrane in RFBs shows low and stable potassium area specific resistance, high efficiency cycling, and undetectable ferricyanide crossover. This membrane also exhibits favorable conductivity for different monovalent cations, which can improve the performance of other RFBs.
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
(2023)
Article
Electrochemistry
Thomas Y. George, Emily F. Kerr, Naphtal O. Haya, Abdulrahman M. Alfaraidi, Roy G. Gordon, Michael J. Aziz
Summary: Organic reactants have great potential for long-lifetime redox flow batteries, and synthetic chemistry provides a wide range of choices for new molecules. It is important to minimize the crossover of these molecules through ion exchange membranes, but the relationship between crossover rate and the structure of the crossing species is not well understood. This study systematically evaluates the effects of size and charge on the permeability of small molecules through the Nafion NR212 cation exchange membrane, revealing that increasing the charge number results in significant permeability reduction, while size-based effects have a smaller impact on permeability.
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
(2023)
Article
Electrochemistry
Eric M. Fell, Diana De Porcellinis, Yan Jing, Valeria Gutierrez-Venegas, Thomas Y. George, Roy G. Gordon, Sergio Granados-Focil, Michael J. Aziz
Summary: We evaluated the suitability of potassium ferri-/ferrocyanide as an electroactive species for aqueous organic redox flow batteries. Our findings indicate that there is no structural decomposition of ferri-/ferrocyanide at pH values as high as 14 in the dark or in indoor light, contrasting with previous reports. Instead, a chemical reduction of ferricyanide to ferrocyanide via chemical oxygen evolution reaction leads to an apparent capacity fade. This parasitic process can be exacerbated by carbon electrodes, and the apparent capacity fade rates can be engineered through the initial system setup.
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
(2023)
Article
Chemistry, Physical
Kiana Amini, Amit N. N. Shocron, Matthew E. E. Suss, Michael J. J. Aziz
Summary: Redox flow batteries have the potential to provide inexpensive and widely deployable energy storage for intermittent renewable electricity. However, their commercialization is limited by high capital costs. This study summarizes the reported areal power densities for lab-scale RFBs, evaluates power optimization pathways, and identifies opportunities for developing higher power density systems.
ACS ENERGY LETTERS
(2023)
Article
Chemistry, Multidisciplinary
Abdulrahman M. Alfaraidi, Bryan Kudisch, Nina Ni, Jayden Thomas, Thomas Y. George, Khashayar Rajabimoghadam, Haihui Joy Jiang, Daniel G. Nocera, Michael J. Aziz, Richard Y. Liu
Summary: Separating and capturing CO2 from sources or the atmosphere is crucial for climate change mitigation. However, the current strategies have high energy costs. This study demonstrates a photochemically driven system that can capture and release CO2 using sunlight. The findings provide thermodynamic and kinetic principles for the development of solar-powered negative emission technologies.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2023)
Article
Chemistry, Multidisciplinary
Jinxu Gao, Kyumin Lee, Kiana Amini, Roy G. Gordon, Theodore A. Betley, Michael J. Aziz
Summary: In this study, a novel iron-based posolyte redox species, FeTPEN, with high redox potential and remarkable aqueous solubility, paired with a specific compound, demonstrated excellent performance in the redox flow battery. The post analysis of the electrolyte provides insights for future stabilization strategies.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Electrochemistry
Min Wu, Meisam Bahari, Yan Jing, Kiana Amini, Eric M. Fell, Thomas Y. George, Roy G. Gordon, Michael J. Aziz
Summary: This study reports a highly stable and potentially inexpensive negolyte species, 2,6-N-TSAQ, for aqueous organic redox flow batteries. The authors demonstrate that pairing 2,6-N-TSAQ with potassium ferrocyanide can achieve the highest open-circuit voltage and low capacity fade rate. However, when cycled at neutral pH, 2,6-N-TSAQ exhibits a significantly higher capacity fade rate. This work highlights the importance of understanding decomposition mechanisms for the development of viable flow battery electrolytes.
BATTERIES & SUPERCAPS
(2022)
