Article
Nanoscience & Nanotechnology
Benoit H. Lessard
Summary: Silicon phthalocyanines are emerging n-type semiconductors with low synthetic complexity and versatile axial groups, making them suitable for use in organic photovoltaics and organic thin-film transistors. Their properties can be fine-tuned without affecting their orbital levels or absorption properties, allowing for integration through solution processing or vapor deposition. These exciting materials show promising future in the field of OTFTs and OPVs.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Engineering, Electrical & Electronic
Rosemary R. Cranston, Mario C. Vebber, Nicole A. Rice, Claire Tonnele, Frederic Castet, Luca Muccioli, Jaclyn L. Brusso, Benoit H. Lessard
Summary: Tin(IV) phthalocyanines show promise as low-cost materials for organic electronic devices, but are relatively understudied compared to their silicon analogues. This study synthesized seven novel SnPcs and investigated their performance in OPVs and OTFTs. While these materials decreased efficiency as ternary additives in OPVs, four of them exhibited higher electron field-effect mobilities in OTFTs compared to SiPc analogues.
ACS APPLIED ELECTRONIC MATERIALS
(2021)
Article
Nanoscience & Nanotechnology
Laura E. Dickson, Rosemary R. Cranston, Hao Xu, Sufal Swaraj, Dwight S. Seferos, Benoit H. Lessard
Summary: In this study, we investigated the deposition characteristics of oligothiophenes with different repeat units in thin films. We found that higher molecular weight polymers form a fast-forming crystalline polymorph, while lower molecular weight polymers form a slow-forming polymorph. As the molecular weight increases, the polymorph transitions occur. Additionally, processing conditions can affect the formation of the polymorphs. The presence of the fast-forming polymorph is correlated with improved performance in organic thin film transistors.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Chemistry, Analytical
Abhishek Kumar, Rita Meunier-Prest, Eric Lesniewska, Marcel Bouvet
Summary: Modulating charge transport in an organic heterojunction sensor enhances its gas sensing properties. In this study, a heterostructure consisting of perfluorinated copper phthalocyanine and lutetium bis-phthalocyanine is investigated for ammonia sensor development. The heterostructure exhibits different charge transport behavior depending on electrode geometry and applied bias. Notably, using small gap electrodes significantly improves charge transport and enhances the ammonia sensing properties of the sensor. The sensor demonstrates high sensitivity and stability at different relative humidity levels, making it suitable for real-world ammonia detection applications.
SENSORS AND ACTUATORS B-CHEMICAL
(2022)
Article
Electrochemistry
Jose Garcia-Calvo, Rosemary R. Cranston, Ismael Lopez-Duarte, Tomas Torres, Benoit H. Lessard
Summary: This article discusses the synthesis and implementation of two novel ruthenium phthalocyanine derivatives in organic thin-film transistors (OTFTs). One derivative showed promising performance, while the other did not. This study provides a promising starting point for the future development of ruthenium phthalocyanine electronic devices.
Article
Chemistry, Multidisciplinary
Zachary J. Comeau, Rosemary R. Cranston, Halynne R. Lamontagne, Adam J. Shuhendler, Benoit H. Lessard
Summary: This study demonstrates that the use of a static, strong magnetic field can improve the microstructure of phthalocyanine (Pc) thin-films, leading to a twofold increase in the mobility of organic thin-film transistors (OTFTs). The magnetic field increases the concentration of oxygen-induced radical species within the Pc thin-film, resulting in magnetic field induced changes to its microstructure and improved charge transport characteristics.
Article
Polymer Science
Zhengran He, Ziyang Zhang, Kyeiwaa Asare-Yeboah, Sheng Bi, Jihua Chen, Dawen Li
Summary: This study demonstrated the use of a metal-containing semicrystalline polymer as an additive to mediate the thin film morphology of solution-grown, small-molecule organic semiconductors, resulting in improved performance of organic thin film transistors.
Article
Nanoscience & Nanotechnology
Zhengran Yi, Yongkun Yan, Hanlin Wang, Wenhao Li, Kaiqing Liu, Yan Zhao, Guangxin Gu, Yunqi Liu
Summary: This study introduces a synthesis strategy called chain-extending polymerization to design polymer semiconductors and demonstrates its superiority over the conventional synthesis strategy of one-pot polymerization. By utilizing this novel strategy, PDPPTT-vinylene polymers with enhanced charge mobilities and significant crystallization are obtained, achieving the required performance for organic circuits.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Materials Science, Multidisciplinary
Seung-Hwan Lee, Hyun-Jun Jeong, Ki-Lim Han, GeonHo Baek, Jin-Seong Park
Summary: Indium oxide and indicone hybrid thin films were successfully grown using molecular layer deposition (MLD) and supercycles, demonstrating adjustable optical, structural, and electrical properties. The hybrid film with a 99:1 cycle ratio of indium oxide : indicone showed promising TFT parameters and excellent mechanical properties, suggesting potential applications in next-generation premium electronic devices.
JOURNAL OF MATERIALS CHEMISTRY C
(2021)
Article
Chemistry, Physical
Maria Elena Sanchez Vergara, Luisa Fernanda Villanueva Heredia, Leon Hamui
Summary: Tetravalent titanyl phthalocyanine (TiOPc) and titanium phthalocyanine dichloride (TiCl2Pc) films were characterized for their optoelectronic behavior. The films exhibited alpha- and beta-phase signals and absorption bands in the near-UV and visible regions. They also displayed photoluminescence emission bands. Heterojunction devices constructed using these films showed changes in J-V curves, indicating potential for optoelectronic applications.
Article
Chemistry, Physical
Junhwan Choi, Min Ju Kim, Joo-Young Kim, Eun Kyung Lee, Changhyeon Lee, Youngkeun Park, Juyeon Kang, Jeong-Il Park, Byung Jin Cho, Sung Gap Im
Summary: The electrical characteristics of organic thin-film transistors (OTFTs) are analyzed based on the alkyl chain length of organic semiconductors and surface polarity of polymer dielectrics in this study. It is found that the OTFT performance can be improved by increasing the alkyl chain length in organic semiconductors, while the non-polar dielectric layer can enhance the charge transport characteristics.
Article
Materials Science, Multidisciplinary
Masahiro Sugiyama, Sophie Jancke, Takafumi Uemura, Masaya Kondo, Yumi Inoue, Naoko Namba, Teppei Araki, Takanori Fukushima, Tsuyoshi Sekitani
Summary: Interface modification with a specific triptycene molecule can enhance the field-effect mobility of various thienoacene-based OSCs in flexible organic thin-film transistors (OTFTs) and increase the crystal grain size of the OSC films.
ORGANIC ELECTRONICS
(2021)
Article
Nanoscience & Nanotechnology
R. A. Rehman, H. J. Zhang, A. Razaq, S. M. Ramay, M. Hasan, M. A. Javed, S. Atiq
Summary: Co-phthalocyanine molecules exhibit diverse adsorption behaviors on Au(111) surface, as investigated by UPS, AR-UPS, and STM techniques. The results reveal that the adsorption of CoPc molecules varies with coverage and temperature, indicating a strong interaction at the CoPc-Au(111) interface.
PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES
(2021)
Article
Materials Science, Multidisciplinary
Yan Yuan, Hui Dai, Haoqiang Chi, Wa Gao, Qi Liu, Cheng Ding, Yan Shen, Zheng Tang, Chen Zhuang, Yong Yang, Yongcai Zhang, Zhigang Zou, Yong Zhou
Summary: Atomically thin Zn2GeO4 (ZGO) nanoribbons were prepared and exhibited efficient and selective CO photoreduction performance, making them an ideal catalytic platform.
ACS MATERIALS LETTERS
(2022)
Article
Materials Science, Multidisciplinary
Yan Yuan, Hui Dai, Haoqiang Chi, Wa Gao, Qi Liu, Cheng Ding, Yan Shen, Zheng Tang, Chen Zhuang, Yong Yang, Yongcai Zhang, Zhigang Zou, Yong Zhou
Summary: Ultra-thin Zn2GeO4 (ZGO) nanoribbons with a thickness of about 1 nm and exposed {100} facet were successfully prepared via photo-oxidation exfoliation at room temperature. These ZGO(100) nanoribbons exhibited efficient and selective CO2 photoreduction, producing a higher yield of CO compared to previous studies on thicker ZGO nanobelts. The atomically thin structure of ZGO(100) shortens the migration distance of charge carriers, facilitating the activation and reduction of CO2.
ACS MATERIALS LETTERS
(2022)
Article
Multidisciplinary Sciences
Georg Gramse, Alexander Kolker, Tingbin Lim, Taylor J. Z. Stock, Hari Solanki, Steven R. Schofield, Enrico Brinciotti, Gabriel Aeppli, Ferry Kienberger, Neil J. Curson
Article
Physics, Applied
T. Stock, J. Nogami
APPLIED PHYSICS LETTERS
(2014)
Article
Physics, Condensed Matter
Taylor J. Z. Stock, Tolu Ogundimu, Jean-Marc Baribeau, Zheng-Hong Lu, Jun Nogami
PHYSICA STATUS SOLIDI B-BASIC SOLID STATE PHYSICS
(2015)
Article
Chemistry, Multidisciplinary
Taylor J. Z. Stock, Oliver Warschkow, Procopios C. Constantinou, Juerong Li, Sarah Fearn, Eleanor Crane, Emily V. S. Hofmann, Alexander Koelker, David R. McKenzie, Steven R. Schofield, Neil J. Curson
Article
Engineering, Electrical & Electronic
Georg Gramse, Alexander Koelker, Tomas Skeren, Taylor J. Z. Stock, Gabriel Aeppli, Ferry Kienberger, Andreas Fuhrer, Neil J. Curson
NATURE ELECTRONICS
(2020)
Article
Chemistry, Physical
Emily V. S. Hofmann, Emilio Scalise, Francesco Montalenti, Taylor J. Z. Stock, Steven R. Schofield, Giovanni Capellini, Leo Miglio, Neil J. Curson, Wolfgang M. Klesse
Summary: The study found that a sub-2% Ge content GeSn wetting layer can be formed at room temperature by depositing Sn on Ge(1 0 0) surface, and small quantities of Sn incorporate into the Ge surface forming two atomic configurations. The ratio of the ad-dimer structures changes with increasing Sn coverage, ultimately resulting in the formation of a two-dimensional wetting layer.
APPLIED SURFACE SCIENCE
(2021)
Article
Nanoscience & Nanotechnology
Gemma Chapman, Haris Votsi, Taylor J. Z. Stock, Steven K. Clowes, Neil J. Curson, Peter H. Aaen, Ben N. Murdin
Summary: In this study, the characteristics of transmission lines made from phosphorus-doped silicon were investigated, revealing that Si:P monolayers possess similar properties to graphene in microwave transmission, with the added advantage of being compatible with CMOS fabrication.
ADVANCED ELECTRONIC MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Emily V. S. Hofmann, Taylor J. Z. Stock, Oliver Warschkow, Rebecca Conybeare, Neil J. J. Curson, Steven R. R. Schofield
Summary: Researchers have found that arsine can chemically react with the surface of germanium at room temperature and successfully incorporate into the lattice, paving the way for the next generation of highly precise doping devices.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Nanoscience & Nanotechnology
Nicolo D'Anna, Dario Ferreira Sanchez, Guy Matmon, Jamie Bragg, Procopios C. Constantinou, Taylor J. Z. Stock, Sarah Fearn, Steven R. Schofield, Neil J. Curson, Marek Bartkowiak, Y. Soh, Daniel Grolimund, Simon Gerber, Gabriel Aeppli
Summary: The progress of miniaturization in integrated electronics has led to atomic and nanometer-sized dopant devices in silicon. However, the ability to obtain atomic-species-specific images of the final structure remains a challenge, which is necessary for building more complex nano-scale devices. This study demonstrates the use of X-ray fluorescence to create an element-specific image of As dopants in Si without affecting the device's low temperature electronic properties.
ADVANCED ELECTRONIC MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Alexander Koelker, Georg Gramse, Taylor J. Z. Stock, Gabriel Aeppli, Neil J. Curson
Summary: This article presents the capability of using an advanced atomic force microscope to inspect the charge transport and performance of an atomically thin phosphorus wire device. By investigating the contact potential, carrier density, and transport properties, it is possible to distinguish different material components and device imperfections, and assess their contributions to the overall electric characteristics of the device. This methodology provides rapid feedback for the fabrication of nanoscale dopant device components in silicon.
Article
Chemistry, Physical
Erhao Gao, Wenjing Feng, Qi Jin, Li Han, Yi He
Summary: The influence of K-doping on the reactive oxygen species and elementary reactions of HCHO catalytic oxidation was investigated using density functional theory (DFT). The introduction of K-doping changed the electronic structures of Ce and O, facilitating the adsorption and activation of HCHO and O2 molecules, enhancing lattice oxygen mobility, and reducing the energy barrier for HCHO oxidation. K-doping also promoted the formation of hydroxyl groups, facilitating HCHO adsorption and oxidation.
Article
Chemistry, Physical
Hao Fu, Zhangliang Xu
Summary: In this study, the adsorption mechanisms and detection performance of formaldehyde, ammonia, and sulfur dioxide on undoped and metal-doped ZnO surfaces were investigated using density functional theory. The results showed that formaldehyde and ammonia were physically adsorbed on the undoped ZnO surface, while sulfur dioxide was weakly chemisorbed. The adsorption energy was enhanced when ZnO was doped with metals. These findings provide theoretical guidance for the application of ZnO substrate materials in gas sensitivity research.
Article
Chemistry, Physical
Atsushi Nomura, Tohru Kurosawa, Migaku Oda, Satoshi Demura, Shogo Kuwahara, Sora Kobayashi, Hideaki Sakata
Summary: The study investigates the tunneling spectra of 1T-TiSe2 in the CDW state and the dip structure below the Fermi level, aiming to determine whether this dip is a CDW gap. The answer to this question is crucial for understanding the driving mechanism of CDW.
Article
Chemistry, Physical
A. S. Petrov, D. I. Rogilo, A. I. Vergules, V. G. Mansurov, D. V. Sheglov, A. V. Latyshev
Summary: This study investigates Si mass transport and morphological transformations on the Si(111) surface during (root 3 x root 3)-Sn reconstruction formation and Si homoepitaxy. The research shows that the formation of different Sn phases at different temperatures affects the Si island nucleation and monatomic step shift, which in turn impact the morphology of the Sn/Si(111) interface. Electromigration-induced drift of disordered Sn domains leads to enhanced noncompensated Si mass transport and surface roughening.
Article
Chemistry, Physical
D. V. Gruznev, L. V. Bondarenko, A. Y. Tupchaya, A. A. Yakovlev, A. N. Mihalyuk, A. V. Zotov, A. A. Saranin
Summary: Deposition of thallium (Tl) onto the Au/Si(111)5 x 2 reconstruction followed by annealing results in the formation of a surface structure with 4 x 2 periodicity. The immiscibility of Au and Tl leads to the migration of Tl atoms over the Si chains. Thallium donates electrons to the surface, converting the metallic surface into an insulating state and altering the inter-chain distance within the array of Au atomic wires.
Article
Chemistry, Physical
Simone Giusepponi, Francesco Buonocore, Barbara Ferrucci, Massimo Celino
Summary: Using ab-initio calculations, the interaction between lead adatom and both clean and doped iron (100) surfaces was investigated. It was found that the lead adatom prefers to adsorb in the hollow site, which is more stable compared to the top and bridge sites, and in this position, it is energetically favorable over the iron adatom. Moreover, lead adsorbed in the hollow site of the iron (100) surface doped with chromium was found to create a more stable system compared to nickel-doped surfaces with an iron adatom in the same position. The study also explored inter-layer distances, bonding mechanisms, magnetic behaviors, and charge density differences. The results provide insights into the role of doping in the interaction between lead adatom and iron surface, and have implications for the analysis of corrosion processes caused by liquid lead.
Article
Chemistry, Physical
Shuo Zhang, Jin-Ho Choi
Summary: The recent synthesis of two-dimensional layered WSi2N4 has attracted attention due to its potential applications. This study investigates the catalytic performance of WSi2N4 monolayers with nitrogen vacancies in the hydrogen evolution reaction using first-principles calculations. The results show that the defective WSi2N4 monolayers exhibit remarkably high catalytic activity comparable to platinum catalysts. Electronic structure calculations also reveal the emergence of spin-polarized states due to the introduction of nitrogen vacancies.
Article
Chemistry, Physical
Xiaoyan Yu, Xin Cao, Wei Kang, Shanhua Chen, Ao Jiang, Yuhao Luo, Wenwei Deng
Summary: First-principles calculations were used to investigate the electronic properties of a TiO2 heterostructure modified with Bi2Te3 co-catalyst. The study revealed that the Bi2Te3/TiO2 interface introduced optimal band offsets, effectively suppressing electron-hole recombination and enhancing the utilization efficiency of photo-generated carriers. Additionally, the Bi2Te3 co-catalyst introduced extra catalytic active sites, further boosting the photo-catalytic hydrogen evolution efficiency.
Article
Chemistry, Physical
Filippo Longo, Emanuel Billeter, Selim Kazaz, Alessia Cesarini, Marin Nikolic, Aarati Chacko, Patrik Schmutz, Zbynek Novotny, Andreas Borgschulte
Summary: Alkaline water electrolysis is a simple and efficient method for renewable hydrogen production, utilizing cheap and abundant transition metals. The catalytic properties of Ni materials are enhanced by the formation of oxidized compounds on the surface. The high electrocatalytic activity of Ni (oxy)-hydroxides is directly related to water intercalation in the passivation layer, supporting the hypothesis of a water mediated OH- diffusion mechanism. The self-organization of the surface structure during passivation layer formation enables high electrode performance.
Article
Chemistry, Physical
Mohan Kumar Kuntumalla, Miriam Fischer, Alon Hoffman
Summary: By investigating the bonding, retention, and thermal stability of nitrogen in H-Diamond (100), it was found that nitrogen can partially recover its bonding with carbon atoms after high-temperature annealing, indicating a high thermal stability of nitrogen in diamond.
Article
Chemistry, Physical
Dong Yue, Liangying Wen, Rong Chen, Jianxin Wang, Zhongqing Yang
Summary: The adsorption behavior of Cl2 molecules on the TiC surface and the formation and transfer of reaction products were studied using first-principles ab initio calculations. The results show that the Cl atoms bonded to the surface Ti atoms are more stable, and the TiCl3 intermediate is easier to form than the TiCl2 intermediate.
Article
Chemistry, Physical
Yatao Wang, Peng Zhang, Hongjuan Li, Qiuju Xu, Shujun Liu, Xiaopeng Liu, Xuehua Guo, Yitao Li, Jinzhang Liu, Sen Dong, Zhi Wei Seh, Qianfan Zhang
Summary: In this study, the adsorption performance of two types of metal-organic frameworks (MOFs) for thiophene and benzene was experimentally investigated. The results showed that IZE-1 exhibited high selectivity and superior adsorption capacity for thiophene, especially at low concentrations. First-principles calculations and molecular dynamics simulations provided insights into the mechanism of thiophene adsorption and the high selectivity observed. This research demonstrates the potential of MOFs for thiophene adsorption, particularly at high concentrations.
