Article
Chemistry, Multidisciplinary
Kanishka Kobbekaduwa, Exian Liu, Qian Zhao, Jasjit Singh Bains, Jianbing Zhang, Ying Shi, Haimei Zheng, Dawen Li, Tong Cai, Ou Chen, Apparao M. Rao, Matthew C. Beard, Joseph M. Luther, Jianbo Gao
Summary: We investigated the carrier drift dynamics in CsPbI3 nanocrystal thin films with a time resolution of sub 25 ps. The carriers exhibit band-like transport characteristics similar to traditional semiconductor solar absorbers (Si and GaAs) due to optical phonon and carrier scattering at high temperatures, prior to trapping. In contrast to popular polaron scattering mechanism, CsPbI3 nanocrystal thin film demonstrates the strongest optical phonon scattering mechanism among other inorganic-organic hybrid perovskites, Si, and GaAs. This ultrafast dynamics study provides a foundation for understanding the fundamental carrier drift properties in perovskite nanocrystal optoelectronics.
Article
Chemistry, Multidisciplinary
Masahiro Funahashi
Summary: The study shows that a bulk photovoltaic effect can be achieved in a chiral smectic crystal phase doped with specific additives. The polarity of the photovoltaic effect can be adjusted by changing the polarization bias. Aggregation of fullerene derivatives into microcrystals promotes hole-electron dissociation, leading to high efficiency of photocurrent generation.
MATERIALS CHEMISTRY FRONTIERS
(2021)
Article
Materials Science, Multidisciplinary
Ayushi Tripathi, Yoonjoo Lee, Changhwa Jung, Soohyun Kim, Soonyong Lee, Woojin Choi, Chaeyeon Park, Young Wan Kwon, Hyunjung Lee, Han Young Woo
Summary: A new donor-donor (D-D')-type polymer (PIDTSCDTS) with extended pi-conjugation and pronounced chain planarity is synthesized by substituting sp(2)-hybridized alkenyl side chains with electron-rich indacenodithiophene (IDT) and cyclopentadithiophene (CDT) moieties. The thermoelectric (TE) properties of the polymer are studied with different doping methods, revealing that hybrid doping (HyD) achieves a higher conductivity (sigma) of up to 500 S cm(-1) due to enhanced (bi)polaron generation. Analysis of the Seebeck coefficient (S) and conductivity (sigma) relationship shows metal-like carrier transport in polymers obtained via sequential doping (SqD) and HyD, resulting in a larger maximum power factor (PFmax) of about 40 mu W m(-1) K-2 compared to SqD films. Careful consideration of degenerate doping and band-like carrier transport is needed for further optimizing the TE properties.
JOURNAL OF MATERIALS CHEMISTRY C
(2023)
Article
Chemistry, Physical
Najmeh Zahabi, Glib Baryshnikov, Mathieu Linares, Igor Zozoulenko
Summary: This study develops a computational technique based on ab initio Car-Parrinello molecular dynamics to trace the temporal motion of charge carriers in the conducting polymer PEDOT. The researchers find that at low temperature, the distortion of the charge carrier gradually disappears and reappears near the position of the counterion. At room temperature, the distortion induced by the charge carrier and atomic vibrations are of similar magnitude, making it challenging to track the charge carrier distortion.
JOURNAL OF CHEMICAL PHYSICS
(2023)
Article
Chemistry, Physical
Snigdha Lal, Marcello Righetto, Aleksander M. Ulatowski, Silvia G. Motti, Zhuotong Sun, Judith L. MacManus-Driscoll, Robert L. Z. Hoye, Laura M. Herz
Summary: This study investigates the terahertz photoconductivity dynamics of thin films of BiOI and reveals a lack of self-trapping in charge carriers, leading to good charge-carrier mobility. The results show that BiOI has a higher potential as a light-harvesting semiconductor compared to traditional lead halide materials.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2023)
Article
Materials Science, Multidisciplinary
Fuming Wu, Yixuan Liu, Jun Zhang, Xiangxiang Li, Hui Yang, Wenping Hu
Summary: In this study, high-mobility stretchable semiconducting blend films were prepared by blending a polymer semiconductor with an elastomer. The resulting blend films have low crystallinity and high aggregation degree, resulting in high stretchability and high mobility. The fully stretchable organic transistors exhibit high hole maximum mobilities at various strains and show high mechanical robustness during repeated stretching-releasing cycles.
SCIENCE CHINA-MATERIALS
(2023)
Article
Chemistry, Physical
Anas Abutaha, Vijila Chellappan, Pawan Kumar, Kedar Hippalgaonkar
Summary: Carrier doping and structural morphology are important in controlling thermoelectric transport in conducting polymers. By using absorption spectroscopy, we can quantitatively determine the carrier concentration and correlate it with electrical conductivity and Seebeck coefficient. The rate of change of electrical conductivity with carrier concentration differs with doping and processing conditions, while the Seebeck coefficient decreases monotonically with carrier concentration. This correlation confirms that charge mobility is the key parameter to improve the thermoelectric performance.
ACS APPLIED ENERGY MATERIALS
(2023)
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, Multidisciplinary
Jiwoo Min, Jaemin Im, Seung Hyun Kim, Hyun Ho Choi, Kilwon Cho
Summary: Molecular doping affects the charge transport pathways and mechanisms in conjugated polymer thin films, and this is highly attributed to the initial molecular ordering of the films. The study reveals the differences in coherent and incoherent charge transport and the impact of chemical structure on the charge transport performance.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Ahmed T. Alanazi, James H. Rice
Summary: Combining plasmonic and semiconductors offers significant potential in creating sensing and photocatalytic devices. This work demonstrates the use of conducting polymer materials with plasmonic nanomaterials to boost plasmon-enhanced Raman scattering spectroscopy signal strength and support oxidation of target molecules.
MATERIALS RESEARCH EXPRESS
(2022)
Article
Chemistry, Multidisciplinary
Garion E. J. Hicks, Sheng Li, Nimrat K. Obhi, Charles N. Jarrett-Wilkins, Dwight S. Seferos
Summary: π-Conjugated polymers have unique properties that depend on their ordering, with programming techniques such as covalent and solution programming playing a key role in controlling their assembly. Progress in programming at different stages of material development highlights order-dependent features and unique assembly techniques for pi-conjugated polymers.
ADVANCED MATERIALS
(2021)
Article
Nanoscience & Nanotechnology
Xinyue Zhang, Genwang Wei, Ye Sheng, Wenjun Bai, Jiong Yang, Wenqing Zhang, Caichao Ye
Summary: High-performance organic semiconductors (OSCs) can be designed by identifying functional units and their role in material properties. A Python-based polymer-unit recognition script (PURS) is proposed to generate polymer-unit fingerprints (PUFp) and classify OSCs based on structure-mobility relationships. The scheme combines machine learning approaches and PUFp information to actively guide the design of high-mobility OSC materials.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Chemistry, Physical
Shunya Yan, Alba Cazorla, Adara Babuji, Eduardo Solano, Christian Ruzie, Yves H. Geerts, Carmen Ocal, Esther Barrena
Summary: The identification of polymorphs in organic semiconductors is significant for establishing structure-property relationships and understanding microscopic charge transport physics. By using GIWAXS and AFM, the morphology and structure of C8O-BTBT-OC8 films were found to be affected by temperature, and the molecular arrangement at the interface has a direct impact on the performance of OFETs.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2022)
Article
Chemistry, Physical
Esmail Amaki, Zabiollah Mahdavifar, Gilles Frapper
Summary: The study focuses on the discovery and properties of two-dimensional materials with pentagonal structures. Using evolutionary algorithms and first-principles calculations, the stability and characteristics of penta-MX2 structures (M = Zn, Cd; X = P, S, Se) were predicted. The results show promising optoelectronic applications of these materials.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2023)
Article
Chemistry, Physical
Oskar Sachnik, Xiao Tan, Dehai Dou, Constantin Haese, Naomi Kinaret, Kun-Han Lin, Denis Andrienko, Martin Baumgarten, Robert Graf, Gert-Jan A. H. Wetzelaer, Jasper J. Michels, Paul W. M. Blom
Summary: A common obstacle in organic semiconductors is the unipolar charge transport caused by trapping of either electrons or holes by extrinsic impurities. In this study, a molecular strategy is proposed to spatially separate the highest occupied and lowest unoccupied molecular orbitals, effectively preventing charge trapping and significantly enhancing charge transport. This strategy opens up possibilities for large band gap organic semiconductors with balanced and trap-free transport.
