Article
Physics, Applied
William M. Strickland, Mehdi Hatefipour, Dylan Langone, S. M. Farzaneh, Javad Shabani
Summary: The surface morphology of near-surface InAs quantum wells is closely connected to low-temperature transport, where electron mobility is highly sensitive to the growth temperature of the underlying graded buffer layer. By introducing an In0.81Al0.19As capping layer, the Fermi level in the InAs layer can be tuned.
APPLIED PHYSICS LETTERS
(2022)
Article
Materials Science, Multidisciplinary
Fenping Cui, Gaige Zheng
Summary: This study reports an approach to manipulating phononic surface waves by constructing a germanium grating on a bulk polar silicon carbide surface, enabling better understanding of grating coupling to SPhPs and potential applications in developing photonic-phononic hybrid structures with other polar dielectrics operating in the Reststrahlen band. The experimental results demonstrate that the grating coupling to SPhPs occurs within the SiC Reststrahlen band and is influenced by the depth and period of the gratings.
Article
Materials Science, Multidisciplinary
Jiawei Fu, Deren Yang, Xuegong Yu
Summary: This paper reviews the fundamentals and research progress of hyperdoped silicon and related infrared photodetectors. It discusses the hyperdoping mechanism and properties of superdoped silicon, as well as the fabrication methods and properties of hyperdoped silicon with different elements. Earlier research on chalcogen hyperdoping paved the way for the use of silicon in infrared photodetectors, while later research on transition metals hyperdoping provides new opportunities for improving device properties.
PHYSICA STATUS SOLIDI A-APPLICATIONS AND MATERIALS SCIENCE
(2022)
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
Chemistry, Physical
Zhe-Yi Ren, Ji -Hong Zhao, Chao Li, Zhan-Guo Chen, Qi-Dai Chen
Summary: Hyperdoping technique introduces transition metals into silicon to enable silicon to operate in infrared wavebands, improving its infrared detection performance.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Chemistry, Physical
F. Komarov, I. Parkhomenko, A. Alzhanova, T. Wang, K. Zhussupbekov, A. Zhussupbekova, I. Shvets, E. Wendler, S. Berman, O. Milchanin
Summary: In this study, silicon layers hyperdoped with selenium were formed through Se implantation followed by pulsed laser annealing. The distribution of Se atoms and the formation of intermediate sub-band within the Si band gap were investigated. The experimental and theoretical sub-band properties were compared, and a significant increase in light absorption across a wide spectral region was observed, demonstrating the potential of selenium hyperdoping for enhancing infrared absorption in silicon.
APPLIED SURFACE SCIENCE
(2023)
Article
Engineering, Electrical & Electronic
Yingnan Xu, Yang Zhao, Jidong Zhang, Xin Wang, Shijia Gao, Zhen Wang, Wenqiang Qiao, Zhi Yuan Wang
Summary: The study realizes the use of a suitably structured pyrrolopyrrole cyanine (PPCy) as a narrow-band photodetector for deep-red and near-infrared spectral regions. By adjusting the weight ratio of the donor and acceptor, the crystallinity and crystal size of PPCy in the active layer can be changed, regulating charge carriers' transportation in the device. Organic photodetectors with a narrow spectral response in the 600-800 nm range have been prepared, achieving the largest specific detectivity (D*) among reported NBA-OPDs in this spectral range.
ACS APPLIED ELECTRONIC MATERIALS
(2023)
Article
Chemistry, Physical
R. E. Asfin, S. M. Melikova, A. V. Domanskaya, K. S. Rutkowski, D. N. Shchepkin
Summary: The IR spectra of CDF3 in solid Ar and N-2 matrices were analyzed in the region of the Fermi polyads, and the effects of Fermi resonance were observed. The theoretical calculations of the potential energy surface and dipole moment function were performed, and the experimental findings were in good agreement with the theoretical analysis.
JOURNAL OF CHEMICAL PHYSICS
(2023)
Article
Engineering, Electrical & Electronic
Yasutomo Kajikawa
Summary: Experimental data on Al-doped p-type 4H-SiC samples were analyzed, showing an anomalous sign reversal of the Hall coefficient at low temperatures. Deduction of activation energy for drift mobility was made based on small-polaron theory, considering the temperature dependence of the preexponential factor, and existing models for the Hall coefficient sign were critically examined. The anomalous sign reversal was well explained by assuming a hopping Hall factor with a negative sign of J(3).
JOURNAL OF ELECTRONIC MATERIALS
(2021)
Article
Materials Science, Multidisciplinary
Jianing Wang, Zhihui Yue, Hao Lu, Jieshi Chen
Summary: This paper investigates the formation energy, band structures, and mechanical properties of carbon-doped single-crystal silicon through first-principle calculations. The study finds that carbon impurity atoms tend to aggregate in the silicon lattice and form a local tetrahedral structure. The concentration and distribution of carbon atoms affect the band gaps and covalent bonding strength, but have little influence on the mechanical properties of the doped structures.
Review
Physics, Multidisciplinary
Yunlong Xiao, He Zhu, Ke Deng, Peng Wang, Qing Li, Ting He, Tao Zhang, Jinshui Miao, Ning Li, Wei Lu, Ning Dai, Weida Hu
Summary: Infrared detection plays a crucial role in astrophysics due to the valuable information it provides. Blocked impurity band (BIB) infrared detectors are highly desirable for space-based astronomical observation due to their wide response range, low dark currents, high quantum efficiencies, and excellent radiation resistance. This review introduces typical BIB device structures and device physics development, discusses progress in Si-based BIB detectors with different doping types, and emphasizes their applications in space-based infrared detection. Furthermore, recent efforts on pixel performance optimization, response extension, and higher operating temperature devices are discussed. Challenges and perspectives of BIB detectors with improved detection performances are also proposed.
SCIENCE CHINA-PHYSICS MECHANICS & ASTRONOMY
(2022)
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
Nanoscience & Nanotechnology
Youzhun Fan, Zhengao Wang, Weizhou Ren, Guangyu Liu, Jun Xing, Taizhong Xiao, Wei Li, Yongjin Li, Peng Yu, Chengyun Ning, Zhiguo Song
Summary: A core-shell structured nanocomposite, consisting of polypyrrole (PPy) nanosheets synthesized in the restricted area of layered bismuth oxychloride (BiOCl) nanosheets, demonstrates excellent photothermal and photodynamic synergistic antibacterial activity under near-infrared (NIR) light irradiation. The atomic-level interface contact and bonding between PPy and BiOCl improve the light-to-heat conversion capabilities of PPy and enhance the transmission of photogenerated charge carriers. These nanocomposites exhibit deep tissue penetration, good biocompatibility, and accelerated wound healing through antimicrobial activity and skin repair function.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Multidisciplinary Sciences
Xin-Xian Wu, Cheng-Yu Lu, Tsung-Yu Huang
Summary: In this study, an oblique-flat-sheet metamaterial perfect absorber (MPA) was designed to enhance the sensitivity of a biosensor. By simulating and conducting experiments, it was confirmed that the MPA had higher sensitivity.
SCIENTIFIC REPORTS
(2022)
Article
Nanoscience & Nanotechnology
Vinh X. Ho, Yifei Wang, Leslie Howe, Michael P. Cooney, Nguyen Q. Vinh
Summary: The practical realization of optoelectronic devices operating in the mid-infrared region is hindered by barriers such as cryogenic operation and complicated growth processes, prompting the interest in extending the performance of graphene photodetectors into this region. By utilizing photoionization of shallow impurities and over band gap excitation in highly doped Si:B and Si:P substrates, researchers have achieved pure graphene photodetectors operating in a broadband range from deep ultraviolet to mid-infrared, with a photoresponsivity of about 5 A/W under mid-infrared illumination at room temperature. This paves the way for a concept of dual-photogating effect induced by both highly doped Si substrates and nanomaterials/nanostructures on top of graphene field-effect transistors.
ACS APPLIED NANO MATERIALS
(2022)
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)