Article
Chemistry, Physical
Fang Yao, Ruiming Li, Zhenglin Jia, Songxue Bai, Yujie Yang, Yanyan Li, Yalun Xu, Guojia Fang, Qianqian Lin
Summary: Chalcogenide-based semiconductors are highly promising for optoelectronic devices due to their low toxicity, cost-effectiveness, stability, and tunable properties. However, limited understanding of charge recombination mechanisms and trap states hinders their development. A comprehensive study on bismuth-based chalcogenide thin films was conducted to investigate the influence of post-treatments. The key findings were that post-treatment with Bi enhanced crystallinity and mobility but also increased carrier density, while post-treatment with sulfur increased carrier lifetime and mobility by passivating trap states.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2023)
Article
Chemistry, Applied
Yu P. Piryatinski, A. B. Verbitsky, A. Dmytruk, M. B. Malynovskyi, P. M. Lutsyk, A. G. Rozhin, O. D. Kachkovsky, Ya O. Prostota, V. V. Kurdyukov
Summary: This study investigated the nature and pathways of electronic excitation relaxation in a cationic pentamethine pyrylocyanine dye at low temperature. Through quantum-chemical calculations and time-resolved spectral measurements, the symmetric and non-symmetric structures in the ground and excited states were characterized, along with proposed energy diagram model for relaxation pathways. The study found that the transition between polymethine and polyene structures significantly impacts the electronic properties of the dye.
Article
Polymer Science
Victor Bonal, Jose A. Quintana, Jose M. Villalvilla, Rafael Munoz-Marmol, Jose C. Mira-Martinez, Pedro G. Boj, Maria E. Cruz, Yolanda Castro, Maria A. Diaz-Garcia
Summary: A new spectrophotometric method for determining the refractive index and thickness of optical polymer films was proposed, with a wide applicability demonstrated through successful use in various applications. The method was validated through the analysis of commercial optical polymers and confirmed with variable-angle spectroscopic ellipsometry.
Article
Engineering, Electrical & Electronic
Seref Kalem
Summary: Black silicon (b-Si) with its promising optical, electronic and structural properties has attracted great attention for a wide range of applications. In this study, a technique involving thermal oxidation, photoresist coating, and chlorine plasma etching was used to produce b-Si and investigate its radiative recombination dynamics. The results showed the presence of a no-phonon radiative recombination component competing with non-radiative recombination at surface defects. The emission exhibited two decay processes with a peak energy at around 480 nm, a fast component of about 15 ps, and a lifetime component of around 50 ps, as well as a slow process in the red spectral region with a time constant of 1500 ps.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2023)
Article
Physics, Applied
Tomoya Saito, Yohei K. Sato, Masami Terauchi
Summary: Investigating the behavior of excitons in anatase crystalline materials and their influence on photocatalytic performance is crucial in understanding their properties. Angle-resolved electron energy-loss spectroscopy was used to evaluate the spatial spread of excitons in anatase TiO2. Three types of excitons (I-III), identified through polarized light absorption experiments, were also experimentally detected in the electron energy-loss spectroscopy spectra. The size of each exciton was evaluated based on the absorption intensity derived from the Kramers-Kronig analysis of the spectra. Excitons I, II, and III were found to have sizes of 8, 5, and 6 nm, respectively. Exciton I, being larger than III, exhibits a similar trend as the theoretical results. Exciton II, initially believed to be delocalized, was found to have a finite size in this experiment. The maximum size of exciton I, around 8 nm, is comparable to the exciton diffusion lengths of the material, indicating its significant influence on the photocatalytic activity of anatase.
JOURNAL OF APPLIED PHYSICS
(2023)
Article
Materials Science, Multidisciplinary
Hiroshi Tanimura, Katsumi Tanimura, Jun'ichi Kanasaki
Summary: Using time-and angle-resolved photoemission spectroscopy, the characteristics of surface exciton on InP(110)-(1 x 1) surface at 90 K under ultrahigh vacuum conditions were studied. The surface exciton exhibited a characteristic photoemission peak with a long lifetime of 9.5 ns at 90 K. The exciton binding energy was 28 meV, significantly larger than bulk excitons. The radial probability density of the exciton was spheroidal, confined within X6 angstrom from the surface along the surface-normal direction with a radial spread of X44 angstrom in the plane parallel to the surface, indicating a quasi-two-dimensional excitonic state. These findings were consistently described by the exciton theory based on the Wannier equation. The reduced screening effects and two-dimensional confinement at the surface region played important roles in characterizing the surface exciton on InP(110)-(1 x 1) surfaces.
Review
Engineering, Biomedical
Julian Heck, Josef Goding, Roberto Portillo Lara, Rylie Green
Summary: This review examines the inherent properties of conducting polymers (CPs) that have hindered their use in additive manufacturing for 3D bioelectronics. It presents a fundamental approach considering the chemical structure and its contribution to electrical, thermal, and mechanical properties. The review discusses how the manipulation of these properties has been addressed in the literature and identifies areas for improvement. Furthermore, it details the current use of CPs in additive manufacturing and the potential future applications of CPs and their composites in the development of 3D bioelectronics.
ACTA BIOMATERIALIA
(2022)
Article
Physics, Applied
T. Kasuya, K. Shima, S. F. Chichibu
Summary: Controlled thinning of wide bandgap semiconductors using CMP and/or RIE is a versatile method for optoelectronic applications. The influences of CMP, wet chemical etching, and RIE on the photoluminescence lifetime of ZnO single crystals were examined. CMP caused the generation of midgap recombination centers, while etching with HCl solution helped regain the lifetime to some extent. RIE had less significant impact on the lifetime, with higher plasma power allowing for longer lifetime due to the presence of attenuating oxide films containing Si.
JOURNAL OF APPLIED PHYSICS
(2023)
Article
Chemistry, Physical
Lin Wang, Yuting Yang, Qianling Cui, Xiaofeng Liu
Summary: The photophysics of oligomerized variants obtained by condensation of a model compound benzoguanamine were examined, revealing higher photoluminescence quantum yield and a slightly blue-shifted emission peak at 500 nm compared with g-CN. The results suggest that oligomers with suppressed trap formation could be strong alternatives for diverse photonics applications.
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
(2022)
Article
Chemistry, Multidisciplinary
A. Khatun, A. Yadav, S. Zhang, S. Saha
Summary: By in-situ oxidative polymerization of preloaded redox-active monomers, the intrinsically insulating MOF has been transformed into electrically conducting MOF superset of conducting-polymer composites, which could be potentially applied in various porous MOFs to achieve engineered conductivity properties.
MATERIALS TODAY CHEMISTRY
(2022)
Article
Chemistry, Physical
Sergei A. Aseyev, Evgeny A. Ryabov, Boris N. Mironov, Igor Kochikov, Anatoly A. Ischenko
Summary: Experimental investigations revealed that graphene on a copper grid undergoes irreversible structural modification under strong laser radiation, while reversible optical excitation processes in antimony and bismuth thin film crystal lattice have been studied.
CHEMICAL PHYSICS LETTERS
(2022)
Article
Chemistry, Multidisciplinary
Nizar Ben Moussa, Mohamed Lajnef, Nessrine Jebari, Cedric Villebasse, Fabien Bayle, Julien Chaste, Ali Madouri, Radouane Chtourou, Etienne Herth
Summary: In this study, low-cost sol-gel spin-coating technique was used to synthesize eco-friendly ZnO multilayer films with excellent optical properties and specific orientation suitable for piezoelectric applications. The ZnO sol-gel thin-films using precursor solutions of molarity 0.75 M exhibited an average optical transparency above 98% and an optical band gap energy of 3.42 eV, showing potential for eco-friendly and cost-effective applications in complementary metal-oxide-semiconductor (CMOS) and integrated circuits (IC).
Article
Chemistry, Physical
Byungmoon Cho, Alicia Swain, Ritika Gautam, Elisa Tomat, Vanessa M. Huxter
Summary: The optical properties and time-resolved dynamics of stable open- and closed-shell Pd(ii) and Cu(ii) complexes were investigated using steady-state and ultrafast transient absorption measurements. The results showed that the overall spin state of the complexes can be tuned through their stable open-shell configurations and reversible redox activity.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2022)
Article
Chemistry, Physical
Fang- Lai, Jui-Fu Yang, Wei-Chun Chen, Dan-Hua Hsieh, Woei-Tyng Lin, Yu-Chao Hsu, Shou-Yi Kuo
Summary: This study investigates the optical properties and carrier dynamics of n-type wurtzite InN with different surface dimensions using photoluminescence and time-resolved photoluminescence analysis. The morphology of InN can be controlled by growth temperature, leading to variations in carrier concentration and emission peak energies. The increase in carrier concentration in InN samples with 2D features is attributed to the presence of donor-like nitrogen vacancies, while the higher emission peak energies are explained by the recombination of Mahan excitons and localized holes in different dimensional structures.
Article
Chemistry, Physical
Ewelina Baran, Artur Birczynski, Przemyslaw Dorozynski, Piotr Kulinowski
Summary: Through the use of 3D 1H UltraShort Echo Time magnetic resonance imaging, the study investigated the spatiotemporal evolution of a hydrophilic polymer matrix tablet hydrated in heavy water. Sodium alginate matrix tablets were used in the experiments, and the images of the matrix during hydration were captured and analyzed using 1H 3D UTE MRI. The findings demonstrated that T2* mapping can effectively serve as a marker for polymer mobilization.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2023)
Article
Chemistry, Inorganic & Nuclear
Hang Liu, Hassan Hafeez, David B. Cordes, Alexandra M. Z. Slawin, Gavin Peters, Stephen L. Lee, Ifor D. W. Samuel, Finlay D. Morrison
Summary: In this work, a novel inorganic halide Cs10MnSb6Cl30 with a distinctive 10H perovskite polytype structure is reported. The Cs10MnSb6Cl30 has 30% B-site vacancies ordered at both corner-and face-sharing sites, resulting in a reduction of octahedral connectivity to 1D and enhanced photoluminescence. This study demonstrates the existence of the 10H perovskite structure in halides and the potential of vacancy rearrangements to tune the optical properties of perovskite polytypes.
INORGANIC CHEMISTRY
(2023)
Article
Chemistry, Physical
P. E. Brown, A. Ruseckas, L. K. Jagadamma, O. Blaszczyk, J. R. Harwell, N. Mica, E. Zysman-Colman, I. D. W. Samuel
Summary: Charge diffusion and extraction are important processes in solar cells. In this study, time-resolved photoluminescence was used to investigate electron diffusion and transfer in hybrid perovskite films. It was found that introducing a fullerene monolayer between the MAPbI3 and SnO2 layers significantly increased the electron transfer velocity, suggesting that electron diffusion limits the rate of charge extraction. These findings suggest that enhancing the electron diffusion coefficient in MAPbI3 could improve the efficiency of solar cells.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2023)
Article
Oncology
Iago P. F. Nunes, Pedro J. L. Crugeira, Fernando J. P. Sampaio, Susana C. P. S. de Oliveira, Juliana M. Azevedo, Caio L. O. Santos, Luiz G. P. Soares, Ifor D. W. Samuel, Saydulla Persheyev, Paulo F. de Ameida, Antonio L. B. Pinheiro
Summary: This study aimed to evaluate the efficacy of photodynamic therapy (PDT) using dimethyl methylene blue zinc chloride double salt (DMMB) and red LED light on Candida albicans. The results showed that applying double PDT in a single session was the most effective approach for inhibiting the proliferation of Candida albicans.
PHOTODIAGNOSIS AND PHOTODYNAMIC THERAPY
(2023)
Article
Biology
Sofie E. Voerman, Beauregard C. Marsh, Ricardo G. Bahia, Guilherme H. Pereira-Filho, Ana Clara F. Becker, Gilberto M. Amado-Filho, Arvydas Ruseckas, Graham A. Turnbull, Ifor D. W. Samuel, Heidi L. Burdett
Summary: Investigated the photo- and chromatic acclimation and morphological change of red coralline algae in mesophotic depths. Results showed that these algae can maintain photosynthetic function under decreasing light intensity and spectral availability, but this leads to smaller and less complex thalli. The photo-acclimatory response is conserved at least at the Order level, while chromatic acclimation is not depth-dependent. Use of photoprotection is necessary at 65 m depth, while optimal light levels are met at 86 m.
PROCEEDINGS OF THE ROYAL SOCIETY B-BIOLOGICAL SCIENCES
(2023)
Article
Multidisciplinary Sciences
Marta Piksa, Wojciech Fortuna, Cheng Lian, Malgorzata Gacka, Ifor D. W. Samuel, Katarzyna Matczyszyn, Krzysztof J. Pawlik
Summary: We evaluated the efficacy of antimicrobial Photodynamic Therapy (APDT) using organic light-emitting diodes (OLED) for antibiotic-resistant clinical strains from diabetic foot ulcers. The isolated strains from diabetic foot ulcers were identified and tested for antibiotic susceptibility. APDT using OLED as a light source and methylene blue as a photosensitizer effectively reduced pathogens and opportunistic bacteria regardless of drug resistance.
SCIENTIFIC REPORTS
(2023)
Article
Chemistry, Multidisciplinary
M. Prabodhi A. Nanayakkara, Qiao He, Arvydas Ruseckas, Anushanth Karalasingam, Lidija Matjacic, Mateus G. Masteghin, Laura Basirico, Ilaria Fratelli, Andrea Ciavatti, Rachel C. Kilbride, Sandra Jenatsch, Andrew J. Parnell, Beatrice Fraboni, Andrew Nisbet, Martin Heeney, K. D. G. Imalka Jayawardena, S. Ravi P. Silva
Summary: This article introduces a new strategy to achieve high-sensitivity performance for X-ray detectors by using high-Z heteroatoms modified organic semiconductors. X-ray detectors fabricated with selenium heteroatoms displayed superior performance in terms of sensitivity and showed efficient charge transfer and transport characteristics.
Article
Nanoscience & Nanotechnology
Jonathon Harwell, Ifor D. W. Samuel
Summary: This study demonstrates the use of nanoimprint lithography to fabricate honeycomb-shaped, quasi-interdigitated electrode structures for back-contact perovskite solar cells. The efficiency of the resulting devices remains almost unchanged as the electrode width is varied from 230 to 2000 nm, suggesting that improving the quality of charge transport layers and reducing recombination are more important for maximizing the performance of these solar cells than reducing the minimum feature size.
ACS APPLIED NANO MATERIALS
(2023)
Article
Chemistry, Physical
Shaoyang Wang, Paul R. Edwards, Maged Abdelsamie, Peter Brown, David Webster, Arvydas Ruseckas, Gopika Rajan, Ana I. S. Neves, Robert W. Martin, Carolin M. Sutter-Fella, Graham A. Turnbull, Ifor D. W. Samuel, Lethy Krishnan Jagadamma
Summary: This study demonstrates the retention of chlorine in the wide bandgap triple anion perovskite and its beneficial role in enhancing indoor light harvesting. By incorporating chlorine, improved crystalline quality, reduced trap states density, and longer carrier lifetime were achieved. The optimized perovskite indoor photovoltaic devices achieved high power conversion efficiency under indoor illumination and successfully powered a textile fiber-based temperature sensor wirelessly. These findings provide a novel route to maximize power output from halide perovskite indoor photovoltaic devices and their promising potential for the Internet of Things (IoT) industry.
JOURNAL OF MATERIALS CHEMISTRY A
(2023)
Article
Chemistry, Physical
M. Chen, P. L. Burn, P. E. Shaw
Summary: Luminescence-based sensing enables sensitive and rapid detection of chemicals, and can be incorporated into portable detectors. While commercially available for explosive detection, there are fewer examples of luminescence-based detection of illicit drugs, requiring further research, particularly in thin film detection.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2023)
Review
Materials Science, Multidisciplinary
Abdulaziz S. R. Bati, Yu Lin Zhong, Paul L. Burn, Mohammad Khaja Nazeeruddin, Paul E. Shaw, Munkhbayar Batmunkh
Summary: Organic/inorganic metal halide perovskites have attracted significant attention as key materials for next-generation photovoltaic technologies due to their low cost, high performance, and solution processability. This review outlines notable achievements in photovoltaic-integrated technologies, including tandem solar cells, building-integrated photovoltaics, space applications, energy storage system integration with batteries and supercapacitors, and photovoltaic-driven catalysis. It also discusses the outstanding challenges and future perspectives for the development of these fields and potential next-generation applications.
COMMUNICATIONS MATERIALS
(2023)
Article
Nanoscience & Nanotechnology
Ming Chen, Ronan Chu, Jos C. M. Kistemaker, Paul L. Burn, Ian R. Gentle, Paul E. Shaw
Summary: Luminescence-based sensing is an effective method for rapid detection of chemical vapors. Photoinduced electron transfer is used for detecting explosive analytes, while photoinduced hole transfer is used for detecting low electron affinity analytes such as illicit drugs. Semicrystalline sensing films can achieve high sensitivity in detecting these analytes.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Materials Science, Multidisciplinary
Neil Mallo, Shaun McAnally, Ronan Chu, Mohammad Babazadeh, Hui Jin, Paul L. Burn, Ian R. Gentle, Paul E. Shaw
Summary: Bulk heterojunction organic solar cells have made significant progress in power conversion efficiency and stability. Fluorination of non-polymeric donor-acceptor-acceptor-donor organic semiconductors can improve thin film density and electron transport while decreasing the optical frequency dielectric constant.
JOURNAL OF MATERIALS CHEMISTRY C
(2023)
Article
Chemistry, Physical
Abdulaziz S. R. Bati, Purevlkham Myagmarsereejid, Marco Fronzi, Kaicai Fan, Porun Liu, Yu Lin Zhong, Paul L. Burn, Ian R. Gentle, Paul E. Shaw, Munkhbayar Batmunkh
Summary: This article reports a simple solution-based method for the preparation of single-atom nickel-doped BP nanosheets and their application in perovskite solar cells, which leads to improved performance. Perovskite films prepared with the Ni-BP passivation layer have reduced defect densities and improved charge-transfer properties.
