Article
Chemistry, Multidisciplinary
Zhuhua Xu, Chuying Sun, Siyi Min, Zilong Ye, Cong Zhao, Jingzhou Li, Zhenghao Liu, Youdi Liu, Wen-Di Li, Man-Chung Tang, Qinghua Song, H. Y. Fu, Feiyu Kang, Jiangyu Li, Yang Shen, Cunjiang Yu, Guodan Wei
Summary: This work demonstrates a NIR nanograting Si/organic heterojunction photodetector which achieves narrowband photodetection without integrating optical filters. It obtains a FWHM of only 26 nm and fast response of 74 μs at 895 nm, with the ability to tailor the response peak from 895 to 977 nm. The sharp and narrow response NIR peak is attributed to the coherent overlapping between the NIR transmission spectrum of the organic layer and diffraction enhanced absorption peak of patterned nanograting Si substrates.
Article
Nanoscience & Nanotechnology
Zhaojue Lan, Linfeng Cai, Dan Luo, Furong Zhu
Summary: The distinct visible-blind narrowband near-infrared (NIR) photo-detection behaviors in the perovskite/polymer hybrid photodetectors (PDs) have been investigated. The semiconducting perovskite layer acts as an internal NIR bandpass due to its high absorption to the visible light and high transparency to the NIR light. The hybrid PDs demonstrated have a -3 dB cutoff frequency of 300 kHz, providing an exciting option for a plethora of applications in bioimaging, environmental detection, and security monitoring.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Nanoscience & Nanotechnology
Yanglin Zhao, Nan Chen, Baozhong Deng, Lifang Wu, Shenghao Wang, Bruno Grandidier, Julien Proust, Jerome Plain, Tao Xu
Summary: High-performance near-infrared (NIR) narrowband organic photodetectors (OPDs) can be achieved by employing a suitable optical design and light manipulation strategy. This has significant implications for applications such as wireless optical communication and light detection.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Engineering, Electrical & Electronic
Sen Liu, Wen Xu, Lu Zi, Nan Ding, Junhua Hu, Jinyang Zhu, Donglei Zhou, Xue Bai, Xu Chen, Hongwei Song
Summary: Self-powered narrowband near-infrared photodetectors based on perovskite films doped with organic dyes (Rhodamine 800) are presented. The doping of Rhodamine 800 allows for adjusting the carrier recombination in perovskites and manipulating the wavelength response range of the photoactive layer through charge collection narrowing technology. The prepared MAPbI3/Rhodamine 800 photodetectors exhibit a narrow spectral response window of 700-800 nm with a full width at half-maxima of less than 60 nm. These characteristics are also observed in other inorganic perovskite films. This design scheme provides an idea to develop wavelength-selective and narrowband photodetectors with excellent business value and multiple application prospects.
ACS APPLIED ELECTRONIC MATERIALS
(2023)
Article
Engineering, Biomedical
Jingwei Pan, Jianjun Du, Qiao Hu, Yuan Liu, Xiaoxue Zhang, Xin Li, Danhong Zhou, Qichao Yao, Saran Long, Jiangli Fan, Xiaojun Peng
Summary: Photothermal therapy (PTT) is a promising approach to cancer treatment. The photothermal conversion ability of Cy7 is efficiently enhanced based on photo-induced electron transfer (PET)-triggered structural deformation. Three Cy7 derivatives, CZ-Cy7, PXZ-Cy7, and PTZ-Cy7, are presented as examples to demonstrate the regulation of the energy release of the excited states.
ADVANCED HEALTHCARE MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Hanbyeol Jang, Yongwook Seok, YiTaek Choi, Sang-Hoo Cho, Kenji Watanabe, Takashi Taniguchi, Kayoung Lee
Summary: The study demonstrates that surface doping with AuCl3 can enhance the performance of InSe photodetectors, surpassing previously reported 2D material-based infrared photodetectors. Investigation of InSe photodetectors with different structures provides insights into the photodetection mechanism and performance optimization. Additionally, encapsulation with hexagonal boron nitride dielectric enables long-term stability of the devices for up to 3 months.
ADVANCED FUNCTIONAL MATERIALS
(2021)
Article
Crystallography
Marwa S. Salem, Ahmed Shaker, Amal H. Al-Bagawia, Ghada Mohamed Aleid, Mohamed S. Othman, Mohammad T. Alshammari, Mostafa Fedawy
Summary: This study presents a filter-less narrowband photodetector based on the architecture of perovskite/organic heterojunction, which achieves satisfactory performance in the near-infrared wavelength range.
Article
Nanoscience & Nanotechnology
Louis Conrad Winkler, Jonas Kublitski, Johannes Benduhn, Karl Leo
Summary: Continuous monitoring of food quality, blood oxygen, or industrial processes requires high-throughput near-infrared photodetectors. Organic photodetectors (OPDs) have a huge market potential for such applications due to their low-cost fabrication, flexibility, and narrowband response. This study utilizes an organic donor-acceptor blend with a low-energy and broad charge transfer (CT) feature to overcome the difficulty of obtaining organic materials with significant absorption beyond 1000 nm. By applying two photocurrent multiplication mechanisms, the recombination of low-energy gap materials is reduced, resulting in a high spectral response and enabling the use of low-cost readout circuitry for signal detection.
ADVANCED ELECTRONIC MATERIALS
(2023)
Article
Nanoscience & Nanotechnology
Tingjun Chen, Zhixin Liu, Lin Zhang, Haotian Wu, Gang Wu, Hongzheng Chen
Summary: This study constructs a visible-blind narrowband photodetector with selective sensitivity to near-infrared light, which integrates different film materials to achieve high responsivity and short response time. The detector has important applications in cardiovascular health assessment.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Chemistry, Physical
Max D. J. Waters, Wenpeng Du, Andres Moreno Carrascosa, Brian Stankus, Martina Cacciarini, Peter M. Weber, Theis Solling
Summary: Excited-state chemistry lacks generalized symmetry rules, making it difficult to build up chemical intuition for excited states. Molecular symmetry plays a crucial role in preserving vibrational coherence during electronic state transitions, with even transient symmetrical structures capable of achieving this coherence. This finding adds a new dimension to how symmetry influences electronic transitions and selection rules for excited-state processes.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2021)
Article
Chemistry, Multidisciplinary
David M. Soro, Jose B. Roque, Jonas W. Rackl, Bohyun Park, Stefan Payer, Yuan Shi, J. Craig Ruble, Alexey L. Kaledin, Mu-Hyun Baik, Djamaladdin G. Musaev, Richmond Sarpong
Summary: This article discusses studies on the core modification of cyclicaliphatic amines through the riboflavin/photo-irradiation approach or the mediation of Cu-(I) and Ag-(I). The structural remodeling of cyclic amines is achieved through oxidative C-N and C-Cbond cleavage using peroxydisulfate (persulfate) as an oxidant. Functional group transformations such as ring-opening reactions and heterocycle interconversion are demonstrated by utilizing flavin-derived photocatalysis, Cu salts, and Ag-(I). Computational studies are conducted to support the proposed mechanistic pathways.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2023)
Article
Chemistry, Multidisciplinary
Guoqiang Zhang, Yangsen Xu, Muhammad Rauf, Jinyu Zhu, Yongliang Li, Chuanxin He, Xiangzhong Ren, Peixin Zhang, Hongwei Mi
Summary: In this study, an n-type doping strategy using alkaline earth metal ions in polymeric carbon nitride (KCN) was proposed to enhance the visible and near-infrared photoactivity. The n-type doping increased electron densities and activated electron transitions, resulting in NIR light absorption. Furthermore, the strategy improved carrier mobility and conductivity, facilitating charge transfer and separation.
Article
Materials Science, Multidisciplinary
Qinghai Zhu, Yexin Chen, Xiaodong Zhu, Yijun Sun, Zhiyuan Cheng, Jing Xu, Mingsheng Xu
Summary: We report the excellent photoresponse performance of a vertical PtSe2/ultrathin Al2O3/Ge photodetector under near-infrared illumination. The PtSe2 layer is formed by directly selenizing a Pt film deposited on Al2O3/Ge. The ultrathin Al2O3 passivation layer effectively weakens carrier recombination and enhances the device's responsivity and response speed.
SCIENCE CHINA-MATERIALS
(2023)
Article
Optics
Li Wan, Rui Zhang, Eunkyung Cho, Hongxiang Li, Veaceslav Coropceanu, Jean-Luc Bredas, Feng Gao
Summary: We propose a widely applicable strategy to fill the spectral gap of circularly polarized light (CPL) detection in the near-infrared (NIR) region by directly inducing chiroptical activity in planar non-fullerene acceptors. This strategy is found to be effective in a wide series of state-of-the-art non-fullerene acceptor families, including ITIC5, o-IDTBR6, and Y6 analogues.
Article
Chemistry, Multidisciplinary
Yuan Li, Shuilin Wu, Yufeng Zheng, Zhaoyang Li, Zhenduo Cui, Hui Jiang, Shengli Zhu, Xiangmei Liu
Summary: Interlayer interactions in 2D materials play a crucial role in promoting catalytic performance. This study demonstrates that asymmetric doping of metal nanoparticle clusters in g-C3N4 enhances catalytic efficiency by inducing microwave excitation of interlayer electron delocalization, leading to improved interlayer migration and enhanced microwave disinfection and pneumonia therapy. Hence, structurally modulated asymmetric doping of 2D materials can provide effective solutions for microwave-based disinfection and pneumonia therapy.
Article
Chemistry, Multidisciplinary
Jochen Vanderspikken, Quan Liu, Zhen Liu, Tom Vandermeeren, Tom Cardeynaels, Sam Gielen, Bruno Van Mele, Niko Van den Brande, Benoit Champagne, Koen Vandewal, Wouter Maes
Summary: This research explores the enhancement of charge transfer absorption by altering the side chains of organic semiconductor donor polymers, thereby increasing the interfacial area between the polymer and fullerene. This improvement extends the detection range and performance of organic narrow-band photodetectors.
ADVANCED FUNCTIONAL MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Sigurd Mertens, Bernhard Siegmund, Koen Vandewal
Summary: This study combines spectroscopic measurements with photothermal techniques to accurately determine the photoluminescence quantum yield (PLQY) of six fluorescent molecules in low concentration solutions. The measurement method demonstrates high reliability and can detect phonon-assisted optical upconversion when the photon energy is below the photothermal threshold. It is found that perylene red solution has the highest PLQY, while the presence of low energy sub-gap impurities in perylene orange solution prevents upconversion.
MATERIALS HORIZONS
(2023)
Article
Chemistry, Multidisciplinary
Marti Gibert-Roca, Miquel Casademont-Vinas, Quan Liu, Koen Vandewal, Alejandro R. Goni, Mariano Campoy-Quiles
Summary: This work proposes a novel spectral splitting device concept called RAINBOW, which lays various semiconducting junctions with cascading bandgaps side by side to improve the efficiency of organic solar cells. Simulations and experiments show that this geometry can reduce thermalization losses and improve light harvesting, resulting in a 46.6% relative improvement in efficiency compared to the best sub-cell. A working proof-of-concept monolithic device consisting of two sub-cells deposited from solution on the same substrate is successfully fabricated, demonstrating the feasibility and potential of the RAINBOW solar cell concept.
ADVANCED MATERIALS
(2023)
Review
Chemistry, Multidisciplinary
Quan Liu, Koen Vandewal
Summary: Organic solar cells benefit from non-fullerene acceptors (NFA) due to their high absorption coefficients, tunable frontier energy levels, and optical gaps, as well as their relatively high luminescence quantum efficiencies as compared to fullerenes. This review summarizes the understanding and quantification of non-radiative decay, as well as strategies for suppressing these losses, in order to guide researchers in finding future solar harvesting donor-acceptor blends with high efficiency.
ADVANCED MATERIALS
(2023)
Article
Optics
Oskar J. Sandberg, Christina Kaiser, Stefan Zeiske, Nasim Zarrabi, Sam Gielen, Wouter Maes, Koen Vandewal, Paul Meredith, Ardalan Armin
Summary: Researchers demonstrate that the dark saturation current in organic photodiodes is fundamentally limited by mid-gap trap states, which leads to an upper limit for specific detectivity. Photodiodes are widely used in industry and consumer electronics. The use of organic semiconductors has gained considerable interest due to their versatile optoelectronic properties and potential for low-cost manufacturing.
Article
Materials Science, Coatings & Films
Pieter Verding, Paulius Pobedinskas, Rani Mary Joy, Essraa Ahmed, Zdenek Remes, Rachith Shanivarasanthe Nithyananda Kumar, Sarah Baron, Markus Hoefer, Volker Sittinger, Milos Nesladek, Ken Haenen, Wim Deferme
Summary: This study investigates four different methods for seeding nanodiamond particles onto glass to produce nanocrystalline diamond coatings. These methods include standard spin coating, dip coating, ink-jet printing, and ultrasonic spray coating. The impact of these techniques on the properties of the diamond coatings, including morphology, optics, and mechanical performance, is studied. The droplet-based techniques show higher roughness but similar mechanical performance compared to spin coating.
SURFACE & COATINGS TECHNOLOGY
(2023)
Article
Chemistry, Physical
Rachith Shanivarasanthe Nithyananda Kumar, Robbe Breugelmans, Xueshi Jiang, Shabnam Ahadzadeh, Guy Brammertz, Pieter Verding, Michael Daenen, Melissa Van Landeghem, Sofie Cambre, Koen Vandewal, Wim Deferme
Summary: The use of polyethylenimine ethoxylated (PEIE), Zinc oxide (ZnO) nanoparticles, and a PEIE-ZnO nanocomposite as functional layers for OLEDs fabricated by solution processing improves electron injection and hole blocking properties, resulting in increased external quantum efficiency. This novel deposition technique offers comparable OLED performance to spin coated and vacuum deposited electron injection layers, enabling the large area fabrication of optoelectronic devices with high efficiencies, high output, low cost, and long lifetime.
APPLIED SURFACE SCIENCE
(2023)
Article
Chemistry, Physical
Sander Smeets, Quan Liu, Jochen Vanderspikken, Tyler James Quill, Sam Gielen, Laurence Lutsen, Koen Vandewal, Wouter Maes
Summary: Traditional synthesis methods and catalysts have limitations for the commercial application of organic solar cells. By using flow chemistry and defect-free synthesis, we have successfully synthesized high-efficiency organic photovoltaic materials with tailorable molar mass.
CHEMISTRY OF MATERIALS
(2023)
Review
Nanoscience & Nanotechnology
Dorothea Scheunemann, Clemens Goehler, Constantin Tormann, Koen Vandewal, Martijn Kemerink
Summary: With power conversion efficiencies approaching 20%, organic solar cells have gained recognition in the field of photovoltaics. However, there is still a need for further improvement in energy and current management. The interpretation schemes for associated losses of energy and charge vary, hindering the design of next-generation organic solar cells. This article reviews important concepts, addresses open questions, and highlights implications for device performance and improvement.
ADVANCED ELECTRONIC MATERIALS
(2023)
Editorial Material
Nanoscience & Nanotechnology
L. Schmidt-Mende, S. Kraner, M. White, K. Vandewal
Article
Green & Sustainable Science & Technology
Willem Vercruysse, Michaela Pappa, Gianfabio Mangione, Derese Desta, An Hardy, Hans-Gerd Boyen, Marlies K. Van Bael, Wouter Marchal, Dries Vandamme
Summary: This study demonstrates that co-pyrolysis of microalgae and reducing sugars increases the retention of nitrogen in biochar, thus reducing the emissions of nitrogen-containing compounds during pyrolysis.
ADVANCED SUSTAINABLE SYSTEMS
(2023)
Article
Chemistry, Multidisciplinary
Rachith Shanivarasanthe Nithyananda Kumar, Maarten Eerdekens, Yovan de Coene, Veda Sandeep Nagaraja, Shabnam Ahadzadeh, Melissa Van Landeghem, Thierry Verbiest, Wim Deferme
Summary: The spatial and surface coverage dependence of plasmonic gold nanoparticles is controlled by a roll-to-roll compatible ultrasonic spray coating technique, resulting in enhanced fluorescence and charge transport in organic light emitting diodes. Two-photon fluorescence microscopy shows a 2-fold enhancement in multi-photon fluorescence for gold nanoparticles stabilized by polystyrene sulfonate (PSS) located 10 nm away from the super yellow fluorophore. Fluorescence enhancement, combined with approximately 2% surface coverage of PNPs, leads to a 33%, 20%, and approximately 40% increase in electroluminescence, luminous efficacy, and external quantum efficiency, respectively.
NANOSCALE ADVANCES
(2023)
Article
Chemistry, Physical
S. Paredis, T. Cardeynaels, S. Brebels, J. Deckers, S. Kuila, A. Lathouwers, M. Van Landeghem, K. Vandewal, A. Danos, A. P. Monkman, B. Champagne, W. Maes
Summary: Three novel TADF emitters based on Qx-Ph-DMAC fluorophore are designed and synthesized, showing improved TADF performance through stepwise modifications including the addition of an extra phenyl ring, incorporation of an electron-deficient coumarin unit, and 'locking' the molecular structure.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2023)
Article
Materials Science, Multidisciplinary
Sam Gielen, Virginia Cuesta Gomez, Sonny Brebels, Tyler James Quill, Jochen Vanderspikken, Laurence Lutsen, Pilar de la Cruz, Koen Vandewal, Fernando Langa, Wouter Maes
Summary: This study presents the design and synthesis of novel push-pull type meso-ethynyl-extended porphyrin compounds and their evaluation in near-infrared organic photodetectors. The compounds show excellent light absorption performance and photoconversion efficiency, making them promising candidates for small molecule-based near-infrared photodetectors.
JOURNAL OF MATERIALS CHEMISTRY C
(2022)