Article
Nanoscience & Nanotechnology
J. Alejandro De Sousa, Raphael Pfattner, Diego Gutierrez, Kilian Jutglar, T. Bromley Stefan, Jaume Veciana, Concepcio Rovira, Marta Mas-Torrent, Bruno Fabre, Nuria Crivillers
Summary: The preparation of monolayers based on an organic radical and its diamagnetic counterpart has been investigated on hydrogen-terminated silicon surfaces. The monolayers exhibit a characteristic diode behavior in solid-state metal/monolayer/semiconductor junctions, which is influenced by the electronic characteristics of the organic molecule. The presence of the radical significantly enhances the rectification ratio and photosensitivity of the junction.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Chemistry, Multidisciplinary
M. Prabodhi A. Nanayakkara, Lidija Matjacic, Sebastian Wood, Filipe Richheimer, Fernando A. Castro, Sandra Jenatsch, Simon Zufle, Rachel Kilbride, Andrew J. Parnell, Mateus G. Masteghin, Hashini M. Thirimanne, Andrew Nisbet, K. D. G. Imalka Jayawardena, S. Ravi P. Silva
Summary: Organic-inorganic hybrid semiconductor X-ray detectors with ultra-low dark currents, high sensitivity, and broadband X-ray response are suitable for medical and industrial applications due to excellent dose linearity, dose rate linearity, and reproducibility.
ADVANCED FUNCTIONAL MATERIALS
(2021)
Article
Chemistry, Multidisciplinary
David Trieb, Paul W. M. Blom, Gert-Jan A. H. Wetzelaer
Summary: A general method is proposed to achieve an ohmic electron contact in organic semiconductor devices by inserting a thin organic interlayer between the metal electrode and the organic semiconductor. It is demonstrated that this interlayer can significantly enhance the injected electron current by over three orders of magnitude. The formation of an ohmic contact is attributed to the elimination of barrier formation through direct contact between the metal and organic semiconductor. Additionally, it is shown that solution processing of such interlayers on top of organic semiconductors is feasible.
ADVANCED MATERIALS INTERFACES
(2023)
Article
Chemistry, Physical
Saheed Adewinbi, Vusani Maphiri, R. Marnadu, Mohd. Shkir, Njod Mansour Hasan Alsdran, H. Algarni, G. Sujithkumar, Bidini Taleatu, Theophile Niyitanga, Haekyoung Kim
Summary: We developed a highly sensitive and pseudocapacitive transparent nickel oxide (NiO) thin film electrode material with the incorporation of Mo-dopant ions. The Mo-doping improved the surface structural and electrochemical properties, resulting in enhanced charge storage potentials. The fabricated NiO thin film showed a red shift in band structure, increased crystallinity, and enhanced Ni2+ electronic transition states with increasing Mo content. The Mo-doped NiO electrode exhibited increased supercapacitive specific capacitance, areal capacity, and excellent cycling stability. The impedance spectroscopic features indicated fast electrolytic ion transfer response with high rate charge storage capability. This study highlights the successful fabrication of a Mo-modified NiO nanostructured electrode film and the influence of Mo impurity on tailoring the properties of NiO as a suitable electrode material for high-performance photocatalytic and supercapacitor devices.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Engineering, Electrical & Electronic
S. A. Al-Ghamdi, Taymour A. Hamdalla, E. F. M. El-Zaidia, Ahmed Obaid M. Alzahrani, Nawal Alghamdi, Syed Khasim, I. S. Yahia, A. A. A. Darwish
Summary: Phthalocyanines are promising materials with unique properties, and the GaClPc/n-Si HJ has been studied for its structural and electronic characteristics, showing potential for applications in photodiode devices.
MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
(2022)
Article
Engineering, Electrical & Electronic
Evgeny Mikheev, Ilan T. Rosen, Johannes Kombe, Francois Damanet, Marc A. Kastner, David Goldhaber-Gordon
Summary: This study reports the challenges in exploring quantum effects in SrTiO3 nanostructures and proposes a highly mobile, gate-tunable, and nanoscale-wide device. The correlation properties of the two-dimensional electron gas channel suggest its significant potential in the field of superconductivity.
NATURE ELECTRONICS
(2023)
Article
Nanoscience & Nanotechnology
Zi Wang, Jing Hu, Jie Lu, Xiaofei Zhu, Xu Zhou, Lizhen Huang, Lifeng Chi
Summary: We report a method of widely tuning the gas sensitivity of organic semiconductor (OSC) gas sensors through charge transport manipulation, achieving an ultrahigh sensitivity to NO2 of nearly 2000%/ppm and a fast square-wave-like response feature. This approach is also effective for tuning the sensitivity to reductive gases, demonstrating its generality for promoting the performance of OSC gas sensors, as well as a promising strategy for other types of sensors or detectors.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Review
Chemistry, Physical
Siwen Zhang, Hong Zhang, Shuo Yang, Xin Zhang, Shilin Li, Liqing Huang, Ya-nan Jing, Linge Xiao, Yuan Zhang, Bing Han, Jia-jie Kang, Huiqiong Zhou
Summary: After decades of development, organic photovoltaic semiconductors have made significant progress and have promising application prospects. Compared with traditional semiconductors, the solution method for preparing photovoltaic semiconductors shows the advantages of low cost and convenient preparation. However, the poor solubility of polymers used in the preparation process requires toxic solvents, which have negative effects on the environment and operators. Organic nanoparticles, on the other hand, have been developed as a solution to these issues and have been applied in various fields.
Article
Materials Science, Multidisciplinary
Karen Fischer, Philipp Marlow, Felix Manger, Christian Sprau, Alexander Colsmann
Summary: In this study, a scalable high-throughput continuous-flow microfluidic system was used to synthesize surfactant-free organic semiconductor dispersions. The concentration and nanoparticle size of the dispersions can be controlled, and they exhibit high stability.
ADVANCED MATERIALS TECHNOLOGIES
(2022)
Article
Chemistry, Organic
Bruno Salgues, Rudraditya Sarkar, Muhammad Luthfi Fajri, Yatzil Alejandra Avalos-Quiroz, Anne-Doriane Manick, Michel Giorgi, Nicolas Vanthuyne, Yannick Carissan, Christine Videlot-Ackermann, Jorg Ackermann, Gabriel Canard, Jean-Luc Parrain, Boris Le Guennic, Denis Jacquemin, Muriel Amatore, Laurent Commeiras, Elena Zaborova, Frederic Fages
Summary: The novel di(benz[f]indenone)-fused tetraazaanthracene derivative synthesized in this study showed strong electron-accepting character, making it attractive for the generation of n-channel semiconducting materials. It exhibited electron transport in organic field effect transistors and demonstrated potential as an electron acceptor material in organic solar cells.
JOURNAL OF ORGANIC CHEMISTRY
(2022)
Article
Physics, Applied
Mehmet Yilmaz, Fatma Yildirim, Sakir Aydogan, Adem Kocyigit
Summary: In this study, ZnO flake interlayers were fabricated by the electrochemical deposition technique on p-Si to form Au/ZnO/p-Si heterostructures. The results showed that the heterostructures exhibited good capacitive performance and photoelectric characteristics.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2023)
Article
Chemistry, Physical
Haruki Sato, Syed A. Abd Rahman, Yota Yamada, Hiroyuki Ishii, Hiroyuki Yoshida
Summary: The authors employed angle-resolved low-energy inverse photoelectron spectroscopy to reveal the LUMO band structure of pentacene and proposed an improved polaron model to explain the phenomenon of bandwidth reduction. The results demonstrate that electron mobility in high-mobility organic semiconductors is limited by polaron formation.
Article
Chemistry, Multidisciplinary
Yihan Zeng, Danqin Li, Hongbo Wu, Zeng Chen, Shifeng Leng, Tianyu Hao, Shaobing Xiong, Qifan Xue, Zaifei Ma, Haiming Zhu, Qinye Bao
Summary: Ternary architecture is an efficient strategy to improve the power conversion efficiency of single-junction organic solar cells. In this study, a ternary device with a power conversion efficiency of 18.13% and a fill factor of 80.10% was reported. The advantages of the designed ternary heterojunction are the complementary light absorption and the matched interfacial electronic structures, as well as the optimized microstructure and enhanced charge transport.
ADVANCED FUNCTIONAL MATERIALS
(2022)
Article
Materials Science, Multidisciplinary
Ahmad Telfah, Qais M. Al-Bataineh, Ahmad A. Ahmad, Rund Abu-Zurayk, Carlos J. Tavares, Johannes Etzkorn, Farzad Foadian
Summary: Polyacrylic acid complexed with polyaniline (PAA/PANI) composite materials have the potential to form organic mixed ion-electron conductive (OMIEC) films, which can be used in optoelectronic and energy storage applications. The composite films are formed through an acid-base reaction, resulting in strong electrostatic interactions and intermolecular hydrogen bonds between PANI and PAA. The separation of PANI-rich domains from PAA-rich matrix in the composite films is observed. The electrical conductivity of the composite films is higher when the content of PANI is 33 wt%, due to the high ionic-electronic coupling at the interface between phase-separated regions.
ORGANIC ELECTRONICS
(2024)
Article
Chemistry, Physical
Daniel Vong, Tahereh Nematiaram, Makena A. Dettmann, Tucker L. Murrey, Lucas S. R. Cavalcante, Sadi M. Gurses, Dhanya Radhakrishnan, Luke L. Daemen, John E. Anthony, Kristie J. Koski, Coleman X. Kronawitter, Alessandro Troisi, Adam J. Moule
Summary: The study demonstrates that relying on calculations from only the Gamma-point instead of the full Brillouin zone may overestimate a in small molecule semiconductors by up to 28%. Additionally, mode analysis reveals that no single mode dominates the phonon spectrum, highlighting the need to develop design rules considering the full spectrum of phonon modes.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2022)
Article
Physics, Applied
M. Bergin, T. A. Myles, A. Radic, C. J. Hatchwell, S. M. Lambrick, D. J. Ward, S. D. Eder, A. Fahy, M. Barr, P. C. Dastoor
Summary: Low-cost optical components with complex internal geometries can be fabricated using resin stereolithography (SLA) 3D printing, achieving the required vacuum properties without in situ baking. A case study demonstrates that a redesigned pinhole plate optical element, manufactured using SLA 3D printing, minimizes key sources of background signal compared to the original machined component.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2022)
Article
Energy & Fuels
Alaa Al-Ahmad, Damian Clark, John Holdsworth, Benjamin Vaughan, Warwick Belcher, Paul Dastoor
Summary: This article presents the optical design, fabrication, and evaluation of a low-cost solar simulator for photovoltaic device testing. The simulator design uses ten different high-power LEDs arranged in a hexagonal geometry to achieve excellent spatial nonuniformity of irradiance while minimizing the number of LEDs required. The design demonstrates AAA performance and low total material cost, making it an economical choice for electrical performance testing of photovoltaic devices.
IEEE JOURNAL OF PHOTOVOLTAICS
(2022)
Article
Materials Science, Multidisciplinary
Alaa Y. Ali, Natalie P. Holmes, Mohsen Ameri, Krishna Feron, Mahir N. Thameel, Matthew G. Barr, Adam Fahy, John Holdsworth, Warwick Belcher, Paul Dastoor, Xiaojing Zhou
Summary: This study demonstrates the production of graphene thin films with good conductivity and transparency using chemical vapour deposition. The graphene films were successfully used as transparent electrodes in organic photovoltaics, resulting in improved performance of the solar cells.
Article
Chemistry, Multidisciplinary
Riku Chowdhury, Natalie P. Holmes, Nathan Cooling, Warwick J. Belcher, Paul C. Dastoor, Xiaojing Zhou
Summary: The fabrication of organic photovoltaics using non-hazardous nanoparticulate inks offers promise for ecofriendly large-scale printed solar modules. Surfactant engineering can optimize the morphology of the nanoparticles and improve the photovoltaic performance.
Article
Materials Science, Multidisciplinary
Alaa Al-Ahmad, Benjamin Vaughan, John Holdsworth, Warwick Belcher, Xiaojing Zhou, Paul Dastoor
Summary: The performance of the electron transport layer is crucial for the operational lifespan of organic photovoltaic devices. Comparing calcium (Ca) and zinc oxide (ZnO) as electron transport layers, it has been found that the ZnO layer provides better stability and higher power conversion efficiency for encapsulated bulk heterojunction OPV devices.
Article
Energy & Fuels
Alaa Al-Ahmad, John Holdsworth, Benjamin Vaughan, Warwick Belcher, Xiaojing Zhou, Paul Dastoor
Summary: The solar simulator is crucial for the development and testing of photovoltaic devices. LED-based solar simulation offers better electrical efficiency and irradiance uniformity while meeting spectral intensity requirements. This work presents a scalable, large-area LED-based solar simulator design that meets Class AAA performance standards for printed solar cell testing.
Article
Chemistry, Multidisciplinary
Justine Bull, Sophie Cottam, Isaac A. Gill, Paul C. Dastoor, Natalie P. Holmes
Summary: In this undergraduate teaching laboratory, students synthesize and characterize colloidal nanoparticles of organic semiconductors and evaluate their suitability for printed electronics applications. The laboratory exercise includes characterization techniques such as scanning electron microscopy, UV-visible spectroscopy, and photoluminescence spectroscopy, and teaches students how to match electron donating and accepting materials based on literature characteristics. The exercise was well-received by the students and can be adapted for various disciplines and levels of experience.
JOURNAL OF CHEMICAL EDUCATION
(2023)
Article
Multidisciplinary Sciences
Sabrina D. Eder, Adam Fahy, Matthew G. Barr, J. R. Manson, Bodil Holst, Paul C. Dastoor
Summary: Neutral helium microscopy is a completely nondestructive, surface-sensitive imaging technique that can be used to observe sub-resolution contrast of nanoscale thin films, providing information on the topography of the surface features and obtaining a macroscopic overview. This technique has wide applications.
NATURE COMMUNICATIONS
(2023)
Article
Chemistry, Multidisciplinary
Connor P. Sherwood, Rafael Crovador, Jessie A. Posar, Nathan Brichta, Matthew P. Simunovic, Fiona Louie, Paul C. Dastoor, Alan M. Brichta, Julie M. Cairney, Natalie P. Holmes, Rebecca Lim, Matthew J. Griffith
Summary: Organic semiconductors are promising materials for neural interfaces due to their biocompatibility, soft mechanical properties, and electron/ion conduction. This study explores the optoelectronic and neural interfacing properties of six organic semiconductor polymers and small molecules, which could be used for trichromatic artificial retinas. The biocompatibility of these materials is confirmed through cell viability and morphological analysis, although differences in morphological compatibility are observed compared to a glass control.
ADVANCED MATERIALS INTERFACES
(2023)
Article
Physics, Applied
M. Bergin, J. Martens, P. C. Dastoor
Summary: By imaging the distribution of electron population on the ioniser, it was found that the instability of the detector at high electron densities is caused by non-uniformities in the electron distribution. The formation of a virtual cathode and a plasma instability are proposed as the origins of this non-uniformity.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2023)
Article
Materials Science, Multidisciplinary
Alaa Y. Y. Ali, Natalie P. P. Holmes, Nathan Cooling, John Holdsworth, Warwick Belcher, Paul Dastoor, Xiaojing Zhou
Summary: The performance of P3HT:PCBM organic photovoltaic devices is influenced by environmental conditions, thermal annealing, and material blend composition. Optimized laboratory fabricated devices show that humidity during fabrication can cause electrode oxidation and photo-oxidation, while thermal annealing can enhance device performance by modifying the morphology of the active layer. Additionally, the choice of PEDOT:PSS material affects the performance of P3HT:PCBM devices.
Article
Chemistry, Physical
S. M. Lambrick, M. Bergin, D. J. Ward, M. Barr, A. Fahy, T. Myles, A. Radic, P. C. Dastoor, J. Ellis, A. P. Jardine
Summary: In this study, results obtained from a scanning helium microscope (SHeM) under typical operating conditions are presented, showing the observation of diffuse scattering with an approximately cosine-like distribution centered about the surface normal. This distribution is markedly different from those observed from well-prepared surfaces typically studied in helium atom scattering experiments. Knowledge of the typical scattering distribution in SHeM experiments serves as a basis for interpreting topographic contrast in images and comparing against more exotic contrast mechanisms.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2022)