Review
Polymer Science
Ting Wang, Bo-Yang Zhang, Hao-Li Zhang
Summary: Singlet fission, a process that enables overcoming the limits of photoenergy conversion, has been extensively studied in the past decade. This review discusses the recent developments, mechanisms, and applications of singlet fission materials in photovoltaics.
MACROMOLECULAR RAPID COMMUNICATIONS
(2022)
Review
Chemistry, Multidisciplinary
Tejasvini Sharma, Prerna Mahajan, Mohammad Adil Afroz, Anupriya Singh, Yukta, Naveen Kumar Tailor, Smruti Purohit, Sonali Verma, Bhavya Padha, Vinay Gupta, Sandeep Arya, Soumitra Satapathi
Summary: Organic photovoltaics have attracted research interest due to their low cost, flexibility, scalability, and robustness. Recent advancements in photon harvesting technology, novel donor-acceptor materials, and device design strategy have improved their power conversion efficiency and stability. This article provides an up-to-date overview of the recent progress in advanced organic photovoltaics, focusing on emerging techniques and materials, and explores their design and deployment strategies, challenges, and achievements. Furthermore, a strategy for future research directions is proposed to drive this field towards commercialization.
Article
Chemistry, Physical
Jiayi Song, Yunxia Guan, Cheng Wang, Xi Bao, Wanjiao Li, Lijia Chen, Lianbin Niu
Summary: In this study, the effect of TmPyPb thickness on the performance of OLEDs was investigated. It was found that increasing the thickness of TmPyPb promotes the triplet-charge annihilation process, resulting in a decrease in the maximum luminance of the devices. The concentration and lifetime of singlet polaron pairs and triplet excitons were found to be regulated by the bias voltage and temperature. Additionally, the MEL responses of the TmPyPb-ETL device showed a W-linear pattern attributed to the combined effect of hyperfine interaction and Zeeman splitting. These findings provide insights into the exciton recombination and annihilation processes in OLEDs.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2023)
Article
Chemistry, Physical
Jiayi Song, Yunxia Guan, Cheng Wang, Xi Bao, Wanjiao Li, Lijia Chen, Lianbin Niu
Summary: The effect of varying thicknesses of TmPyPb on the electroluminescence performance of OLEDs was investigated by fabricating devices and measuring their magneto-electroluminescence. The study found that as the thickness of TmPyPb increases, the maximum luminance of the devices decreases due to an increase in the triplet-charge annihilation process. Additionally, the thickness of TmPyPb affects the luminance efficiency of the devices, with a decrease at first and then an enhancement.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2023)
Article
Chemistry, Multidisciplinary
Sarah R. E. Orsborne, Jeffrey Gorman, Leah R. Weiss, Akshay Sridhar, Naitik A. Panjwani, Giorgio Divitini, Peter Budden, David Palecek, Sean T. J. Ryan, Akshay Rao, Rosana Collepardo-Guevara, Afaf H. El-Sagheer, Tom Brown, Jan Behrends, Richard H. Friend, Florian Auras
Summary: In this study, DNA-encoded assembly of pentacenes capable of singlet fission (SF) was used to achieve precise structural control and explore the SF process. The results showed that SF evolved through a quintet state and demonstrated efficient and controlled semiconductor operation.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2023)
Article
Chemistry, Physical
Jeswin Sunny, Ebin Sebastian, Suvarna Sujilkumar, Frank Wuerthner, Bernd Engels, Mahesh Hariharan
Summary: Efficient population of triplet excited states has been a long-standing challenge in heavy metal-free organic chromophores. This study demonstrates the unprecedented population of triplet excited states in nitrogen-annulated perylene bisimide chromophores through the design strategy of nitrogen annulation. The enhancement in triplet population by bromine substitution is also observed.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2023)
Article
Chemistry, Physical
Jeswin Sunny, Ebin Sebastian, Suvarna Sujilkumar, Frank Wuerthner, Bernd Engels, Mahesh Hariharan
Summary: This study reports the unprecedented population of triplet excited states in a series of nitrogen-annulated perylene bisimide chromophores. Ultrafast intersystem crossing is found in Br-NPBI, leading to enhanced triplet population. The quantum chemical calculations reveal the important role of nitrogen annulation in tuning the excited state energy levels to favor intersystem crossing.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2023)
Article
Engineering, Electrical & Electronic
Zuozong Yin, Shiqiao Gao, Lei Jin, Shengkai Guo, Qinghe Wu, Zezhang Li
Summary: This study introduces a shoe-mounted piezoelectric energy harvester for harvesting energy from human walking. Experimental results demonstrate that the proposed PEH can generate stable output power at different gait frequencies, suggesting its potential for driving wearable devices.
SENSORS AND ACTUATORS A-PHYSICAL
(2021)
Article
Chemistry, Physical
Adam R. Tetreault, Ajinkya Mandlik, Kacper Wojtkiewicz, Kyle Nova, Timothy P. Bender
Summary: Triplet harvesting is a useful property that can improve the performance of solar cells. There are already some examples of organic solar cells with triplet harvesting capability, but materials are still being developed. While the current density output has been improved, further research is needed to confirm the viability of working devices.
ACS APPLIED ENERGY MATERIALS
(2023)
Article
Chemistry, Physical
Zhiwei Wang, Yu Wang, Wenlong Wang, Dexiu Wu, Qianyuan Wu, Hongying Hu
Summary: In this study, it was found that electron localization and high spin state of metal active sites favored peroxymonosulfate (PMS) co-adsorption and dissociation, promoting selective production of singlet oxygen (1O2). By fabricating single cobalt atoms anchored on uneven graphite carbon nitride nanosheet (Co-SA/CMN), the highest 1O2 production selectivity so far was achieved with 87.8% of the consumed PMS converted to 1O2. The Co-SA/CMN/PMS system exhibited remarkable degradation efficiency to multiple organic pollutants, resistance to environmental interference, and robust stability at the device level. This finding deepens the understanding of the mechanistic origins of high 1O2 production selectivity and provides a rational strategy for precisely controlling 1O2 generation in PMS activation.
APPLIED CATALYSIS B-ENVIRONMENTAL
(2023)
Article
Multidisciplinary Sciences
Brandon K. Rugg, Kori E. Smyser, Brian Fluegel, Christopher H. Chang, Karl J. Thorley, Sean Parkin, John E. Anthony, Joel D. Eaves, Justin C. Johnson
Summary: The photo-driven process of singlet fission can generate coupled triplet pairs with intriguing properties. Among the sublevels, the quintet is particularly interesting for quantum information. Previous theoretical work has shown that this sublevel can be selectively populated under certain conditions.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2022)
Article
Physics, Applied
Linyao Tu, Xiantong Tang, Ying Wang, Xi Zhao, Caihong Ma, Shengnan Ye, Zuhong Xiong
Summary: This study investigates the dynamic behaviors of exciplexes at the rubrene/C-60 interface using magnetoconductance and magnetoelectroluminescence techniques, revealing a previously unreported reverse intersystem crossing from triplet to singlet exciplexes. It also uncovers additional processes that affect this transition, providing insights into the physical origin of sub-band-gap electroluminescence in rubrene/C-60-based OLEDs.
PHYSICAL REVIEW APPLIED
(2021)
Article
Chemistry, Multidisciplinary
Tian-Jiao Wen, Zhi-Xi Liu, Zeng Chen, Jiadong Zhou, Ziqiu Shen, Yiqun Xiao, Xinhui Lu, Zengqi Xie, Haiming Zhu, Chang-Zhi Li, Hongzheng Chen
Summary: Despite recent progress, organic photovoltaics (OPVs) still need to work on balancing efficiency, stability, and cost. This study developed two non-fused electron acceptors which, when blended with a specific polymer, achieved the highest reported efficiency for fully unfused electron acceptors.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2021)
Article
Chemistry, Multidisciplinary
Yifan Bo, Yuxuan Hou, Dominik Thiel, Renee Weiss, Timothy Clark, Michael J. Ferguson, Rik R. Tykwinski, Dirk M. Guldi
Summary: This study designs two tetracene dimers with different linking modes, and characterizes the interplay between intramolecular singlet fission (intra-SF) and intramolecular triplet-triplet annihilation up-conversion (intra-TTA-UC) through steady-state and time-resolved absorption and fluorescence spectroscopy. By using Pd-phthalocyanine as a sensitizer, intra-TTA-UC is achieved in the two dimers via indirect photoexcitation in the near-infrared part of the solar spectrum. Temperature-dependent measurements reveal the impact of thermal effects on intra-SF and intra-TTA-UC in different dimers.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2023)
Article
Nanoscience & Nanotechnology
Tasnuva Hamid, Marcin Kielar, Soniya D. Yambem, Ajay K. Pandey
Summary: This research unveils the multifunctional operation of tetracene/polycyclopentadithiophene-benzothiadiazole (PCPDTBT) and tetracene sensitized PCPDTBT:fullerene bulk heterojunctions (BHJs) as organic photovoltaics (OPV), organic light emitting diodes (OLEDs), and organic photodetectors (OPDs). The strategic introduction of tetracene enhances electroluminescence at 800 nm and achieves an optimal balance of triple energy transfer.
ADVANCED ELECTRONIC MATERIALS
(2021)
Article
Nanoscience & Nanotechnology
Joshua N. Arthur, Mujeeb Ullah Chaudhry, Maria A. Woodruff, Ajay K. Pandey, Soniya D. Yambem
ADVANCED ELECTRONIC MATERIALS
(2020)
Article
Clinical Neurology
Yaqub Jonmohamadi, Suresh Muthukumaraswamy, Joseph Chen, Jonathan Roberts, Ross Crawford, Ajay Pandey
Article
Materials Science, Multidisciplinary
Basanagouda B. Patil, Yasunori Takeda, Thu Trang Do, Amandeep Singh, Tomohito Sekine, Soniya D. Yambem, Shizuo Tokito, Samarendra P. Singh, Ajay K. Pandey, Prashant Sonar
PHYSICA STATUS SOLIDI A-APPLICATIONS AND MATERIALS SCIENCE
(2020)
Article
Nanoscience & Nanotechnology
Marcin Kielar, Helen Gooch, Li Xu, Ajay K. Pandey, Pankaj Sah
Summary: Traditional optical methods for detecting electrical brain activity often involve a trade-off between tissue depth and resolution, but a new class of high-resolution light-sensing devices can detect ultra-low changes in fluorescent neuronal activity without the need for optical setup.
Article
Nanoscience & Nanotechnology
Tasnuva Hamid, Marcin Kielar, Soniya D. Yambem, Ajay K. Pandey
Summary: This research unveils the multifunctional operation of tetracene/polycyclopentadithiophene-benzothiadiazole (PCPDTBT) and tetracene sensitized PCPDTBT:fullerene bulk heterojunctions (BHJs) as organic photovoltaics (OPV), organic light emitting diodes (OLEDs), and organic photodetectors (OPDs). The strategic introduction of tetracene enhances electroluminescence at 800 nm and achieves an optimal balance of triple energy transfer.
ADVANCED ELECTRONIC MATERIALS
(2021)
Article
Nanoscience & Nanotechnology
Gurudutt Bhat, Qian Liu, Marcin Kielar, Yuya Hamada, Tsuyoshi Michinobu, Pankaj Sah, Aung Ko Ko Kyaw, Ajay K. Pandey, Prashant Sonar
Summary: Organic photodetectors (OPDs) are promising for next-generation digital imaging and wearable sensors due to their low cost and high performance, with NIR photon detection improved through donor-acceptor molecular engineering. The novel IDT-based polymers show great potential in enhancing light detection in OPDs.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Engineering, Electrical & Electronic
Andrew L. Fielding, Ajay K. Pandey, Yaqub Jonmohamadi, Riccardo Via, Damien C. Weber, Antony J. Lomax, Giovanni Fattori
Summary: The Intel RealSense (TM) D415 depth camera has been found suitable for measuring respiratory motion of the body surface, with a high degree of precision. The camera is capable of capturing motion accurately at various distances and is not affected by different motion patterns.
IEEE SENSORS JOURNAL
(2021)
Article
Materials Science, Multidisciplinary
Basanagouda B. Patil, Yasunori Takeda, Subhash Singh, Amandeep Singh, Thu Trang Do, Kostya (Ken) Ostrikov, Samarendra P. Singh, Shizuo Tokito, Ajay K. Pandey, Prashant Sonar
Summary: This study advances interface engineering in organic transistors by using specific structured polymer materials and Cytop as the dielectric material. Modulating the performance of dual-gate transistors using Cytop opens new research avenues towards enhancing the stability of such transistors for real-world applications.
MATERIALS RESEARCH EXPRESS
(2021)
Article
Nanoscience & Nanotechnology
Joshua N. Arthur, Ajay K. Pandey, Jean-Michel Nunzi, Soniya D. Yambem
Summary: Confocal microscopy provides insights into doping and de-doping processes in OTFT sensors, and sheds light on the mechanisms of hydrogen peroxide sensitivity in HIFET sensors. It is an effective research tool in this field.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Robotics
Andrew Razjigaev, Ajay K. Pandey, David Howard, Jonathan Roberts, Liao Wu
Summary: This article proposes an end-to-end design and production workflow for patient-specific surgical manipulators, assessing dexterity using orientability constrained by task space obstacles. The design achieved higher dexterity in challenging knee arthroscopy operations.
IEEE TRANSACTIONS ON ROBOTICS
(2022)
Article
Nanoscience & Nanotechnology
Marcin Kielar, Roger Marek, Matthew Kenna, Cameron M. Cole, Li Xu, Soniya D. Yambem, Pankaj Sah, Ajay K. Pandey
Summary: Mapping neurons in the brain with micron-resolution is crucial for understanding cognitive function and neurological diseases. This study demonstrates that a simple OLED system can be used to stimulate and locate neuronal activity accurately, laying the foundation for more advanced geometries in vivo.
Article
Biology
Thomas Suehn, Nazila Esmaeili, Moritz Spiller, Maximilian Costa, Axel Boese, Jessica Bertrand, Ajay Pandey, Christoph Lohmann, Michael Friebe, Alfredo Illanes
Summary: This study investigates a new sensing approach to derive palpation-related information from vibration signals in instrument-tissue-interactions. The results show that simple features derived from the vibro-acoustic signals can effectively differentiate between biological tissues, highlighting the potential of this approach in minimally invasive surgery.
COMPUTERS IN BIOLOGY AND MEDICINE
(2023)
Article
Automation & Control Systems
Andrew Razjigaev, Ajay Pandey, David Howard, Jonathan Roberts, Anjali Jaiprakash, Ross Crawford, Liao Wu
Summary: This study proposes a semiautonomous controller to assist teleoperation by steering a camera to keep a target in the center of the field of view, thus assisting in surveying different orientations about the target with image-based information. The proposed techniques are simulated and validated on the SnakeRaven robot, with successful operation achieved.
IEEE-ASME TRANSACTIONS ON MECHATRONICS
(2023)
Article
Nanoscience & Nanotechnology
Gurudutt Bhat, Marcin Kielar, Pankaj Sah, Ajay K. Pandey, Prashant Sonar
Summary: A new type of organic photodetector is proposed, which extends its absorption spectrum to the near-infrared region by adjusting the composition of the active layer, and significant progress has been made in terms of high energy efficiency and fast response.
ADVANCED ELECTRONIC MATERIALS
(2023)
Article
Engineering, Electrical & Electronic
Shahnewaz Ali, Yaqub Jonmohamadi, Yu Takeda, Jonathan Roberts, Ross Crawford, Ajay K. Pandey
Summary: Minimally invasive surgery offers advantages to patients but limits surgeons' abilities. Medical robotics faces visualization challenges specific to MIS. A proposed adaptive light control system addresses image visualization problems of MIS by automatically adjusting lighting conditions.
IEEE SENSORS JOURNAL
(2021)