Article
Chemistry, Physical
Weijun Wu, Andrew E. E. Sifain, Courtney A. A. Delpo, Gregory D. D. Scholes
Summary: This study theoretically investigates the quantum dynamics of a donor-acceptor cavity system and finds that polaritons have the potential to enhance free charge carrier generation on an ultrafast timescale, but are suppressed by internal conversion and cavity loss on a longer timescale.
JOURNAL OF CHEMICAL PHYSICS
(2022)
Article
Chemistry, Physical
Jumi Park, Jooyoung Sung, Dongho Kim
Summary: In this study, the charge transfer (CT) processes in donor-pyreneacceptor (DPA) molecules were deciphered using various time-resolved spectroscopic measurements. The ultrafast CT rate of approximately 200 fs in DPA molecules was observed, indicating isoenergetic potential surfaces for LE and CT states. Strong electronic coupling between the LE and CT states was found upon the introduction of the acceptor to the pyrene moiety in DPA systems.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2021)
Article
Polymer Science
Chan Im, Sang-Woong Kang, Jeong-Yoon Choi, Jongdeok An
Summary: The research investigates the application of non-fullerene type acceptors in the field of photovoltaics, revealing their potential as electron donors. Through spectrally resolved photovoltaic characters and transient absorption spectroscopy analysis, the pathways of NFA-originated excitons and origin-dependent decay behaviors were disclosed, deepening the understanding of the application of new material classes in renewable energy strategies.
Article
Chemistry, Physical
Sonia Kotowicz, Mateusz Korzec, Agnieszka Katarzyna Pajak, Sylwia Golba, Jan Grzegorz Malecki, Mariola Siwy, Justyna Grzelak, Sebastian Mackowski, Ewa Schab-Balcerzak
Summary: In this study, six novel symmetrical bis-(imino-1,8-naphthalimides) compounds with different core and N-substituent structures were synthesized and characterized for their thermal, optical, and electrochemical properties. The compounds showed stability at high temperatures and demonstrated electrochemical activity for reductions and oxidations. They had deep LUMO levels and emitted light from blue to yellow, with potential for light emission under voltage in devices incorporating neat compounds or blends with PVK:PBD.
Review
Chemistry, Multidisciplinary
Shubhankar Barman, Aritri Pal, Anurag Mukherjee, Swadesh Paul, Anuja Datta, Suhrit Ghosh
Summary: This review provides an overview of the research status and future development of organic ferroelectric materials. Among them, donor-acceptor charge transfer complexes are considered promising for ferroelectricity. The review lists different organic systems and molecular assembly forms, and discusses their performances in terms of ferroelectricity and piezoelectricity.
CHEMISTRY-A EUROPEAN JOURNAL
(2023)
Article
Nanoscience & Nanotechnology
Fan-Fang Kong, Xiao-Jun Tian, Yang Zhang, Yao Zhang, Gong Chen, Yun-Jie Yu, Shi-Hao Jing, Hong-Ying Gao, Yi Luo, Jin-Long Yang, Zhen-Chao Dong, J. G. Hou
Summary: This study demonstrates a transition from incoherent to coherent electronic energy transfer in donor-acceptor model systems by precisely controlling the separations. Through scanning tunnelling microscopy induced luminescence, two new emission peaks were observed with decreasing intermolecular distance. The spatially resolved spectroscopic images of the redshifted emission reveal a delocalized nature of the excitonic state over the whole heterodimer, suggesting a coherent wave-like transfer of the excitons.
NATURE NANOTECHNOLOGY
(2022)
Review
Chemistry, Multidisciplinary
Xi Chen, Xue Zhang, Xiao Xiao, Zhijia Wang, Jianzhang Zhao
Summary: Charge transfer is crucial in molecular electron donor-acceptor systems for artificial photosynthesis, photocatalysis, photovoltaics, and fundamental photochemistry. We summarized recent developments in the study of charge transfer and discussed its application in thermally activated delayed fluorescence (TADF) emitters.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Chemistry, Multidisciplinary
Alexander Aster, Christopher Rumble, Anna-Bea Bornhof, Hsin-Hua Huang, Naomi Sakai, Tomas Solomek, Stefan Matile, Eric Vauthey
Summary: The study focuses on the charge-transfer dynamics of electron donor-acceptor dyads based on NDI chromophores, demonstrating long-lived charge separation in the triplet state can be achieved by controlling the mutual orientation of the donor-acceptor sub-units.
Article
Chemistry, Applied
Mariana F. G. Velho, Ana Paracana, Joao Sarra, Luis Alcacer, Joao Avo, Manuel Almeida, Dulce Belo, Helena Alves, Ana Charas
Summary: Extended derivatives of α-DT-TTF were synthesized for the first time, achieving redshifted absorption spectra and accessible reduction potentials through A-D-A molecular design. One of the new compounds exhibited photoconductivity in the UV-visible range in crystals.
Article
Chemistry, Analytical
Andreas Russegger, Lisa Eiber, Andreas Steinegger, Sergey M. Borisov
Summary: Four new zinc(II) Schiff base complexes with carbazole electron donor units and either a 2,3-pyrazinedicarbonitrile or a phthalonitrile acceptor unit were synthesized. These complexes exhibit thermally activated delayed fluorescence (TADF) and have high emission quantum yields up to 47%. The photophysical properties are influenced by the acceptor unit and the phenyl linker between the donor and acceptor unit. The TADF decay times are temperature-dependent, making these complexes potentially suitable as molecular thermometers.
Article
Optics
Pengfei Yang, Ming Li, Xing Han, Hai He, Gang Li, Chang-Ling Zou, Pengfei Zhang, Yuhua Qian, Tiancai Zhang
Summary: Breaking the time-reversal symmetry of light is crucial for fundamental physics and has gained increasing attention in the study of non-reciprocal photonic devices. In this study, a chiral cavity quantum electrodynamics system with multiple atoms coupled to a Fabry-Perot cavity is experimentally demonstrated. By polarizing the internal quantum state of the atoms, the time-reversal symmetry of the atom-cavity interaction is broken. The strongly coupled atom-cavity system can be described by non-reciprocal quasiparticles called cavity polaritons.
LASER & PHOTONICS REVIEWS
(2023)
Article
Chemistry, Physical
Chengxi Li, Xue Jin, Jianlei Han, Tonghan Zhao, Pengfei Duan
Summary: This article discusses the circularly polarized luminescence (CPL) activity of chiroptical materials, emphasizing the importance of increasing the dissymmetry factor glum value. Recent studies have shown that amplification of glum value can be achieved in hybrid donor-acceptor systems, providing new insights for the development of highly efficient CPL materials.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2021)
Review
Chemistry, Multidisciplinary
Arkajit Mandal, Michael A. D. Taylor, Braden M. M. Weight, Eric R. R. Koessler, Xinyang Li, Pengfei Huo
Summary: This article summarizes some of the theoretical advances in polariton chemistry, covering fundamental frameworks, computational techniques, and applications in fields such as photochemistry and vibrational strong coupling. It highlights the importance of the theory of quantum light-matter interactions and discusses recent progress in resolving challenges in quantum electrodynamics.
Article
Chemistry, Applied
Hongke Zhou, Qian Huang, Xingliang Liu, Defang Xu, Weidong Zhang, Shengjie Fu, Xiucun Feng, Zhan Zhang
Summary: Two donor-acceptor luminophores PTZ-DPS and BPTZ-DPS, designed with phenothiazine and diphenylsulfone units, exhibit twisted molecular conformation, unique intramolecular charge transfer behavior, and intense fluorescence. They show switchable mechanofluorochromism, high solid-state luminescence efficiencies, and large spectral red shifts. The mechanofluorochromic behavior is due to phase transition between crystalline to amorphous states.
Article
Multidisciplinary Sciences
Xinyang Li, Arkajit Mandal, Pengfei Huo
Summary: Recent experiments show that coupling molecules inside an optical microcavity can control chemical reactivities, specifically through the mechanism of vibrational strong coupling. The modification of chemical reactivities in VSC polariton chemistry, dependent on photon frequency, can be explained by non-Markovian dynamics and the dynamic caging effect of the reaction coordinate. This study sheds light on the suppression of reaction rates for a specific cavity frequency, reminiscent of a solvent caging effect.
NATURE COMMUNICATIONS
(2021)
Article
Nanoscience & Nanotechnology
Hannah L. Smith, Jordan T. Dull, Swagat K. Mohapatra, Khaled Al Kurdi, Stephen Barlow, Seth R. Marder, Barry P. Rand, Antoine Kahn
Summary: Doping with specific oxidants can enhance the performance of organic semiconductors and find applications in organic optoelectronic devices. This study discovers a new p-type dopant, CN6-CP, with high electron affinity for improved conductivity in thin films. By introducing CN6-CP and n-type dopants into different organic materials, and combining fabrication techniques, a rectifying p-i-n homojunction diode with unique properties and excellent performance has been successfully fabricated.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Chemistry, Physical
Tianran Liu, Xiaoming Zhao, Ping Wang, Quinn C. Burlingame, Junnan Hu, Kwangdong Roh, Zhaojian Xu, Barry P. Rand, Minjie Chen, Yueh-Lin Loo
Summary: This study demonstrates a transparent photovoltaic technology that absorbs ultraviolet light while maintaining high transparency and color neutrality. By precisely tuning the halide ratio during thermal co-evaporation, large-area perovskite films with ideal absorption cutoff can be achieved. The resulting transparent photovoltaics exhibit high visible transmittance, color rendering index, and output power density under solar illumination.
ADVANCED ENERGY MATERIALS
(2023)
Article
Chemistry, Physical
Zhaojian Xu, Ross A. Kerner, Steven P. Harvey, Kai Zhu, Joseph J. Berry, Barry P. Rand
Summary: Voltage-induced halide segregation in mixed-halide perovskite devices is limited by iodide oxidation at the anode, leading to iodide and bromide accumulation at the cathode and anode, respectively. Switching the anode material to Ag prevents segregation by inhibiting the oxidation of lattice iodide. This suggests that redox-active additives can be used to suppress halide segregation. Overall, this work provides new insights into the impact of voltage bias on halide perovskite devices.
ACS ENERGY LETTERS
(2023)
Article
Chemistry, Physical
Saeed-Uz-Zaman Khan, Jules Bertrandie, Manting Gui, Anirudh Sharma, Wejdan Alsufyani, Julien F. Gorenflot, Frederic Laquai, Derya Baran, Barry P. Rand
Summary: Understanding the factors affecting energy loss in organic photovoltaics (OPVs) is crucial for improving their efficiency and developing new materials. This study provides experimental evidence supporting the correlation between charge-transfer state disorder and energy loss. It also proposes a universal metric for quantifying energy loss in OPVs by measuring the peak of the charge-transfer state distribution using temperature-dependent external quantum efficiency measurements.
Article
Chemistry, Multidisciplinary
Jesse A. Wisch, Xiao Liu, Patrick J. Sarver, Cesar N. Prieto Kullmer, Agustin Millet, David W. C. MacMillan, Barry P. Rand
Summary: An organic diode is demonstrated to transfer energy near-field to molecules in solution through surface plasmon polaritons, which is different from the conventional far-field excitation via absorption of traveling photons. Electrically created excitons couple to surface plasmon modes in the cathode, leading to the subsequent excitation of chromophore molecules. The diode and the near-field energy transfer process are characterized using external quantum efficiency and time resolved photoluminescence measurements. Additionally, the potential of this device for photochemical applications is shown by the ability of excited chromophores to charge-transfer to quencher molecules.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Review
Chemistry, Multidisciplinary
William B. Gunnarsson, Kwangdong Roh, Lianfeng Zhao, John P. Murphy, Alex J. Grede, Noel C. Giebink, Barry P. Rand
Summary: Thin-film organic, colloidal quantum dot, and metal halide perovskite semiconductors are all being researched for a wavelength-tunable diode laser technology that does not require epitaxial growth. Efforts have been made to overcome fundamental and practical barriers to achieve reliable injection lasing. Challenges in resonator design, electrical injection, and heat dissipation are outlined, and the unique optical gain physics of each system are discussed. Systematic progress will require new materials or indirect pumping schemes for organic and colloidal quantum dot laser diodes, while improvements in device architecture and film processing are crucial for perovskite lasers. The current status of nonepitaxial laser diodes is discussed in the context of their epitaxial counterparts, showing reasons to be optimistic for the future.
Article
Economics
Amelie C. Lemay, Sigurd Wagner, Barry P. Rand
Summary: We analyze a dataset of rooftop solar installations in the US, finding low adoption rates (0.93% on average) and the potential for fifteen states to meet their residential electricity demand through solar power. Factors positively correlated with solar adoption include insolation, retail electricity price, Democratic voting fraction, net metering, and fraction of science or engineering degree holders, while fraction of business or education degree holders is negatively correlated. Cost savings are a strong motivator for PV adoption, especially in Republican-majority areas, highlighting the importance of compensatory programs like net metering. However, barriers of knowledge and installation cost remain, suggesting the need for knowledge campaigns and stable financial incentives.
Article
Chemistry, Physical
Tianran Liu, Quinn C. Burlingame, Marko R. Ivancevic, Xiao Liu, Junnan Hu, Barry P. Rand, Yueh-Lin Loo
Summary: In this study, the photostability of films and solar cells comprising Y-series non-fullerene acceptors were investigated. UV and near-UV photons were found to be responsible for the degradation of acceptors, leading to early performance losses in solar cells. The weak point in the Y-series acceptors susceptible to UV-induced cleavage was identified as the vinylene linkage between the core and electron-accepting moieties. The efficiency losses in organic photovoltaic cells were attributed to the formation of traps, reducing charge extraction efficiency and facilitating non-radiative recombination as the Y-series acceptors degrade.
ADVANCED ENERGY MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Junnan Hu, Zhaojian Xu, Tucker L. Murrey, Istvan Pelczer, Antoine Kahn, Jeffrey Schwartz, Barry P. Rand
Summary: The thermal stress on lead perovskites leads to the formation of I2 and triiodide, which can attack and decompose the lead halide perovskites. However, the surface treatment with thiol reducing agents can prevent the decomposition and improve the stability and performance of the perovskite solar cells.
ADVANCED MATERIALS
(2023)
Article
Chemistry, Physical
Marko R. Ivancevic, Melissa L. Ball, Vinayak Bhat, Jesse A. Wisch, Sean R. Parkin, Chad Risko, Barry P. Rand, Yueh-Lin Loo
Summary: Contorted polycyclic aromatic molecules have been studied as host molecules for fullerenes, but their association is generally weak. In this study, researchers designed and synthesized π-extended buckybowls with larger surface areas. These buckybowls can form stronger complexes with fullerenes, especially those with butoxy side chains, due to their larger dipole moments and preferred 1:2 stoichiometry.
CHEMISTRY OF MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Zhifei Yan, Kristopher G. Reynolds, Rui Sun, Yongjin Shin, Agnes E. Thorarinsdottir, Miguel I. Gonzalez, Bryan Kudisch, Giulia Galli, Daniel G. Nocera
Summary: This study reports the oxidation chemistry of carbonates, providing concrete pathways for the design of catalysts for carbonate management in energy storage applications.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2023)
Article
Engineering, Electrical & Electronic
Jisu Hong, Jingwan Kim, Zhijun Li, Chenhao Cong, Barry P. Rand, Sang Yong Nam, Se Hyun Kim, Yun-Hi Kim
Summary: In this study, a diketopyrrolopyrrole (DPP)-based polymer with long and branched alkyl side chains was designed to improve solubility. The introduction of the branched side chains allowed for π-π interactions and crystalline structures, while preventing steric hindrance. Using the EHD jet printing technique, the feasibility of using P29DPP-TT as a semiconductor in integrated electronic systems was examined, with promising field-effect mobility of 0.55 cm(2) V-1 s(-1).
ACS APPLIED ELECTRONIC MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Quinn C. Burlingame, Xiao Liu, Melissa L. Ball, Barry P. Rand, Yueh-Lin Loo
Summary: Intermolecular charge-transfer excitons play a crucial role in determining the performance of organic solar cells. By investigating the voltage-dependent photoluminescence, photocurrent, and ultrafast pump-probe transient absorption spectra, the properties of charge transfer excitons can be revealed. The correlation between voltage-dependent photocurrent and charge-transfer exciton photoluminescence affects the photovoltaic fill factor, as efficient charge-transfer exciton dissociation requires voltage.
ENERGY & ENVIRONMENTAL SCIENCE
(2023)
Article
Chemistry, Multidisciplinary
Abdulrahman M. Alfaraidi, Bryan Kudisch, Nina Ni, Jayden Thomas, Thomas Y. George, Khashayar Rajabimoghadam, Haihui Joy Jiang, Daniel G. Nocera, Michael J. Aziz, Richard Y. Liu
Summary: Separating and capturing CO2 from sources or the atmosphere is crucial for climate change mitigation. However, the current strategies have high energy costs. This study demonstrates a photochemically driven system that can capture and release CO2 using sunlight. The findings provide thermodynamic and kinetic principles for the development of solar-powered negative emission technologies.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2023)
Article
Chemistry, Multidisciplinary
Jordan T. Dull, Xiangyu Chen, Holly M. Johnson, Maria Clara Otani, Frank Schreiber, Paulette Clancy, Barry P. Rand
Summary: The study found that organic molecules with low molecular aspect ratios tend to remain smooth as thickness increases, while molecules with high aspect ratios quickly roughen. Molecular dynamics simulations showed that the Ehrlich-Schwobel barrier alone cannot fully explain this trend.
MATERIALS HORIZONS
(2022)
