Article
Chemistry, Physical
Ping Zhang, Linjie Chen, Shaoxiang Sheng, Wenqi Hu, Huiru Liu, Chen Ma, Zijia Liu, Baojie Feng, Peng Cheng, Yiqi Zhang, Lan Chen, Jin Zhao, Kehui Wu
Summary: This study investigated the adsorption and self-assembly structures of melamine molecules on an Ag(111) surface using low temperature scanning tunneling microscopy (STM) combined with tip-enhanced Raman spectroscopy (TERS). Two ordered self-assembly phases of melamine molecules on Ag(111) were observed, and it was found that the dehydrogenation of melamine can be controlled by annealing the sample or through a tip-enhanced photo-catalytic effect.
JOURNAL OF CHEMICAL PHYSICS
(2022)
Article
Chemistry, Physical
Yajie Bian, Junbo Cheng, Yuyi Zhang, Haitao Sun, Jun Zhang, Xiaolei Zhang, Qingyuan Jin
Summary: In this study, scanning tunneling microscopy was used to investigate the self-assembly of 2-(hydroxymethyl)benzimidazole (HMBI) molecules and the thermal stability of the assemblies on the herringbone structure of a reconstructed Au (111) surface. The results suggest that the arrangement of the molecules on the surface is collectively determined by hydrogen-bond interactions between HMBI molecules and the molecule-substrate interaction. After annealing, the molecules can dehydrogenate and form molecule-metal coordinated structures. Additionally, the herringbone structure of the substrate is found to be compressed in the metal coordinated structures compared to the native Au (111) surface, indicating a mutual influence between the adsorbate and substrate.
CHEMICAL PHYSICS LETTERS
(2022)
Article
Chemistry, Physical
Hungu Kang, Hyerim Jeong, Sicheon Seong, Seulki Han, Young Ji Son, Hiroyuki Tahara, Tomohiro Hayashi, Hyo Jae Yoon, Jaegeun Noh
Summary: The study investigates the formation and surface structures of cyclohexanethiolate (CYH-S) and cyclohexaneselenolate (CYH-Se) SAMs on gold electrodes, revealing significant differences in their formation and structures. Furthermore, it was found that both types of SAMs could be used for modifying the work function of the gold substrate through Kelvin probe force microscopy measurements.
APPLIED SURFACE SCIENCE
(2022)
Article
Physics, Multidisciplinary
Liliany Noviyanty Pamasi, Shota Nishida, Shohei Takemoto, Ken Hattori
Summary: This study investigated the epitaxial growth of Fe islands on clean and ammonia-saturated Si surfaces, revealing that ammonia-saturated surfaces resulted in slower growth rates and weaker 3D island features for Fe islands. The difference was attributed to a lower density of nucleation centers on ammonia-saturated surfaces due to inactivation of half of the reactive bare Si adatoms. Analysis of crystalline domain size and relative number of domains at the initial growth stage suggested Fe configuration models that initiate the nucleation centers.
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN
(2021)
Article
Chemistry, Physical
Shakil N. Afraj, Chingche Chen, Arulmozhi Velusamy, Jia-Hao Liu, Shuehlin Yau, Ming-Chou Chen
Summary: This study used in situ STM to investigate the adsorption orientation of DPDTTP molecules on a ordered Au(111) electrode in different electrolytes, revealing the role of electrode reconstruction and potential control in guiding the formation of ordered DPDTTP structures. The adsorption behavior of DPDTTP molecules was found to be influenced by the potential and the chemical identity of the supporting electrolyte, with differences observed in different acidic environments.
JOURNAL OF PHYSICAL CHEMISTRY C
Article
Chemistry, Multidisciplinary
Thorsten Schultz, Dominique Lungwitz, Elena Longhi, Stephen Barlow, Seth R. Marder, Norbert Koch
Summary: The interlayer method is demonstrated as a universal approach to adjust the energy level offset at inorganic/organic semiconductor interfaces, allowing for improved electronic functionality and paving the way for novel optoelectronic device functionalities.
ADVANCED FUNCTIONAL MATERIALS
(2021)
Article
Chemistry, Multidisciplinary
Yang Lu, Zi-Di Yu, Hio-Ieng Un, Ze-Fan Yao, Hao-Yang You, Wenlong Jin, Liang Li, Zi-Yuan Wang, Bo-Wei Dong, Stephen Barlow, Elena Longhi, Chong-an Di, Daoben Zhu, Jie-Yu Wang, Carlos Silva, Seth R. Marder, Jian Pei
Summary: A simple solution-based co-deposition method has been reported to achieve high conductivity n-doped polymers. These polymers exhibit surprising structural tolerance and excellent miscibility with commonly used n-dopants, allowing high concentrations and high mobility of charge carriers simultaneously, resulting in excellent electrical conductivity and thermoelectric performance.
ADVANCED MATERIALS
(2021)
Article
Chemistry, Physical
Samik Jhulki, Cameron H. Feriante, Roman Mysyk, Austin M. Evans, Alexandre Magasinski, Ashwin Sankara Raman, Kostiantyn Turcheniuk, Stephen Barlow, William R. Dichtel, Gleb Yushin, Seth R. Marder
Summary: A two-dimensional imine-linked COF, TAPB-NDI COF, containing NDI redox groups exhibited high theoretical capacity and Faradaic efficiency in lithium-ion batteries. Its large pores facilitated efficient Li+ ion transport, showcasing potential for use in neutral aqueous batteries.
ACS APPLIED ENERGY MATERIALS
(2021)
Article
Materials Science, Multidisciplinary
Dominique Lungwitz, Thorsten Schultz, Claudia E. Tait, Jan Behrends, Swagat K. Mohapatra, Stephen Barlow, Seth R. Marder, Andreas Opitz, Norbert Koch
Summary: Doping the electron-transport polymer with a reducing metallocene leads to increased bulk conductivity and decreased contact resistance. Accumulation of dopant molecules on the substrate reduces the work function, minimizing the electron injection barrier. Understanding the effects of electrode modification by the dopant and bulk doping is crucial for comprehensively understanding doped organic semiconductors.
ADVANCED OPTICAL MATERIALS
(2021)
Article
Chemistry, Multidisciplinary
Samik Jhulki, Hio-Ieng Un, Yi-Fan Ding, Chad Risko, Swagat K. Mohapatra, Jian Pei, Stephen Barlow, Seth R. Marder
Summary: The reactivity of N-DMBI-H with a variety of imide- and amide-containing semiconductor molecules was investigated, showing that the reaction rates do not correlate well with the reduction potentials of the molecules. Different molecules have different reaction pathways.
Article
Chemistry, Multidisciplinary
Ian E. Jacobs, Yue Lin, Yuxuan Huang, Xinglong Ren, Dimitrios Simatos, Chen Chen, Dion Tjhe, Martin Statz, Lianglun Lai, Peter A. Finn, William G. Neal, Gabriele D'Avino, Vincent Lemaur, Simone Fratini, David Beljonne, Joseph Strzalka, Christian B. Nielsen, Stephen Barlow, Seth R. Marder, Iain McCulloch, Henning Sirringhaus
Summary: Molecular doping using redox-active small molecules as dopants for organic semiconductors has attracted increased research interest for various emerging applications. A recent breakthrough in ion-exchange based doping separates the redox and charge compensation steps, leading to high conductivity and ion exchange efficiencies in excess of 99%. Factors enabling high performance include the choice of solvent and increased doping strength, illustrating a connection between electrochemical doping and ion exchange while highlighting limitations in stability at high redox potential.
ADVANCED MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Lianfeng Zhao, Kwangdong Roh, Sara Kacmoli, Khaled Al Kurdi, Xiao Liu, Stephen Barlow, Seth R. Marder, Claire Gmachl, Barry P. Rand
Summary: This study presents high-speed PeLEDs, driven by nanosecond electrical pulses, with improved device design and material considerations. The fast operation of PeLEDs allows access to transient charge carrier dynamics and reveals new electroluminescence quenching pathways. Additionally, integrated DFB gratings enhance directional light emission and forward radiation output.
ADVANCED MATERIALS
(2021)
Article
Multidisciplinary Sciences
Bluebell H. Drummond, Naoya Aizawa, Yadong Zhang, William K. Myers, Yao Xiong, Matthew W. Cooper, Stephen Barlow, Qinying Gu, Leah R. Weiss, Alexander J. Gillett, Dan Credgington, Yong-Jin Pu, Seth R. Marder, Emrys W. Evans
Summary: The spin interconversion mechanism plays a crucial role in the efficiency of delayed fluorescence emitters, with the energy gap between local excitation and charge-transfer triplet states affecting the spin exchange process. As this energy separation decreases, the spin interconversion shifts from a direct mechanism to an indirect one involving intermediate states.
NATURE COMMUNICATIONS
(2021)
Article
Chemistry, Multidisciplinary
Marie-Helene Tremblay, Kelly Schutt, Yadong Zhang, Stephen Barlow, Henry J. Snaith, Seth R. Marder
Summary: A newly developed norbornene homopolymer with hole-transporting side chains was compared to spiro-OMeTAD as a hole-transport material in perovskite solar cells. The study showed that PSCs fabricated with the polymer achieved a comparable efficiency to those with spiro-OMeTAD, while demonstrating improved light and heat stability.
NEW JOURNAL OF CHEMISTRY
(2021)
Article
Chemistry, Inorganic & Nuclear
Elena Longhi, Chad Risko, John Bacsa, Victor Khrustalev, Sergei Rigin, Karttikay Moudgil, Tatiana Timofeeva, Seth R. Marder, Stephen Barlow
Summary: The boron-containing ruthenium complexes with pentamethylcyclopentadienyl have been found to be moderately air stable and highly reducing, making them suitable n-dopants for organic semiconductors. The structure and reducing properties of these complexes can be tuned by using arenes substituted with different pi-electron donors, leading to different isomers with varying redox potentials and reactivities.
DALTON TRANSACTIONS
(2021)
Article
Materials Science, Multidisciplinary
David A. Valverde-Chavez, Esteban Rojas-Gatjens, Jacob Williamson, Sarthak Jariwala, Yangwei Shi, Declan P. McCarthy, Stephen Barlow, Seth R. Marder, David S. Ginger, Carlos Silva-Acuna
Summary: Through ECPL spectroscopy, the role of surface passivation in carrier trapping and nonlinear recombination dynamics in hybrid metal-halide perovskites was investigated. Passivation was found to have a direct impact on both shallow and deep traps, with passivation of deep traps increasing carrier lifetimes and passivation of shallow traps reducing the excitation density required for saturation. The study demonstrates the ability of ECPL to provide detailed information on the passivation of shallow traps beyond conventional time-resolved photoluminescence techniques.
JOURNAL OF MATERIALS CHEMISTRY C
(2021)
Article
Chemistry, Physical
Marie-Helene Tremblay, Kelly Schutt, Federico Pulvirenti, Thorsten Schultz, Berthold Wegner, Xiaojia Jia, Yadong Zhang, Elena Longhi, Raghunath R. Dasari, Canek Fuentes-Hernandez, Bernard Kippelen, Norbert Koch, Henry J. Snaith, Stephen Barlow, Seth R. Marder
Summary: A new polymer CL has been synthesized as a crosslinking additive, which can enhance the electrical conductivity and stability of perovskite solar cells. Devices with undoped PCBCB:CL extraction layers exhibited higher power conversion efficiencies and excellent thermal stability compared to PCBM and PCBCB counterparts.
JOURNAL OF MATERIALS CHEMISTRY A
(2021)
Article
Chemistry, Multidisciplinary
Pablo Simon Marques, Giacomo Londi, Brett Yurash, Thuc-Quyen Nguyen, Stephen Barlow, Seth R. Marder, David Beljonne
Summary: Computational studies on the potential interactions between three borane Lewis acids and semiconducting pi-conjugated polymers have revealed changes in electronic structure and optical properties, as well as evaluated the doping effects and reaction mechanisms. These studies provide insight into the complex interplay between partial hybridization, charge transfer, and changes in polymer conformation, offering potential applications in organic electronic devices.
Article
Materials Science, Multidisciplinary
Yu Yamashita, Samik Jhulki, Dinesh Bhardwaj, Elena Longhi, Shohei Kumagai, Shun Watanabe, Stephen Barlow, Seth R. Marder, Jun Takeya
Summary: Chemical doping with (RuCp*Mes)(2) was demonstrated to be an effective method for producing highly stable n-doped conjugated polymers, with moderate ambient stability and preventing dopant loss in air. The study showed that sequential n-doping with organometallic dopants can lead to improved electronic properties and air stability in polymer semiconductors.
JOURNAL OF MATERIALS CHEMISTRY C
(2021)
Article
Chemistry, Multidisciplinary
Khaled Al Kurdi, Declan P. McCarthy, David P. McMeekin, Sebastian O. Furer, Marie-Helene Tremblay, Stephen Barlow, Udo Bach, Seth R. Marder
Summary: A new polymer was synthesized and used as an electron-extraction layer in lead-halide perovskite solar cells, exhibiting good performance. Compared to SnO2 and small-molecule derivatives, the polymer achieved higher power conversion efficiencies in solar cells.
MATERIALS CHEMISTRY FRONTIERS
(2021)