Article
Nanoscience & Nanotechnology
Jino C. John, Kanagaraj Shanmugasundaram, Gopinadhanpillai Gopakumar, Youngson Choe
Summary: In this study, novel molecules TBT and PBT were designed and synthesized for nondoped light-emitting electrochemical cells (LECs), resulting in red-emitting LECs with excellent thermal stability and photophysical properties for the first time. The fabricated devices displayed hyper red color emission with specific CIE coordinates and electroluminescent peaks, along with brightness, current efficiency, and power efficiency values for PBT and TBT.
Article
Chemistry, Applied
Zhiyong Liu, Ning Wang
Summary: The study found that using NC(70)BA as the third component material in inverted small molecule organic photovoltaic devices can achieve higher power conversion efficiency, attributed to the increased photocurrent density, open-circuit voltage, and fill factor. The hollow spherical structure of NC(70)BA helps improve the continuity of electron transport channels, and the optimization of molecular arrangement and crystallinity in the ternary photoactive layer also supports enhanced performance.
Article
Chemistry, Multidisciplinary
Jing Ma, Yusheng Zhou, Haiyang Gao, Fangming Zhu, Guodong Liang
Summary: Photoluminescent materials are widely used in various fields, with a recent study reporting rare full-type photoluminescence from a single organic molecule, showing properties like aggregation-induced phosphorescence and thermoresponsive persistent phosphorescence. The materials can provide multiple visual signals upon temperature variation, and their luminescence thermoresponse is amplified when incorporated into polymers. A facile method based on phosphorescence lifetime and image analysis is used for quick, visual, and quantitative temperature sensing, showing promise for applications in quantitative temperature sensing.
MATERIALS CHEMISTRY FRONTIERS
(2021)
Article
Chemistry, Multidisciplinary
Bo Pang, Chentong Liao, Xiaopeng Xu, Shaoqian Peng, Jianlong Xia, Yuanyuan Guo, Yuan Xie, Yuting Chen, Chunhui Duan, Hongbin Wu, Ruipeng Li, Qiang Peng
Summary: Suppressing photon energy loss, especially non-radiative loss, is crucial for improving the device performance of organic solar cells (OSCs). By introducing a BNIDT block into the PM6 polymer backbone, a series of triplet polymer donors were developed, leading to a reduced singlet-triplet energy gap and optimized morphology. This effectively suppresses non-radiative recombination and enhances charge transfer and transport, resulting in a champion power conversion efficiency (PCE) of 19.02%.
ADVANCED MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Archana Puthanveedu, Shanmugasundaram Kanagaraj, Amutha Anjali Bai, Sunesh Chozhidakath Damodharan, Youngson Choe
Summary: Solid-state LEC is advantageous due to its simple structure, easy fabrication process, and compatibility with air-stable electrodes. In this design strategy, an electron-rich triphe-nylamine was combined with thenil imidazole and phenanthroimidazole to construct an active material for non-doped LECs. The findings showed the potential of LECs as low-cost light sources with bright blue emissions.
ORGANIC ELECTRONICS
(2023)
Article
Materials Science, Multidisciplinary
Suresh Madduri, Venkata Seshaiah Katta, Sai Santosh Kumar Raavi, Shiv Govind Singh
Summary: Vacuum-deposited small-molecule organic solar cells based on DTDCTB and C70 molecules were studied for their solar cell parameters and the influence of thermal annealing on the morphology of the active layer. The research provides a detailed analysis of the impact of thermal annealing on the nano-morphology of the active layer and the improvement of device performance through controlling trap-assisted charge recombination affecting the short-circuit current.
Article
Energy & Fuels
Zhiyong Liu, Ning Wang
Summary: The ternary strategy with BTR as donor, Y11 as host acceptor, and MeIC as guest acceptor achieved a high PCE of 13.85% in optimized SMPVs. An approximately 10% improvement in efficiency was realized compared to binary SMPVs, mainly due to the significantly increased J(SC).
Article
Engineering, Electrical & Electronic
C. Prabakar, S. Muthukumaran, V. Raja
Summary: Co (3%)-doped ZnO and Co, Cu (Co = 3% and Cu = 2 to 4%) dual-doped ZnO nanostructures were prepared using chemical co-precipitation route. The addition of Co/Cu did not alter the structure of hexagonal ZnO, while Cu doping decreased crystallite size and Co2+/Cu2+ doping increased defect sites. Optical properties and photoluminescence indicated that Cu doping reduced optical absorption and increased band gap, with higher Cu concentration leading to more defect states.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2021)
Review
Materials Science, Multidisciplinary
Bin Kan, Yuanyuan Kan, Lijian Zuo, Xueliang Shi, Ke Gao
Summary: Recent breakthroughs have been made in solution-processed organic solar cells combining small-molecule donor and nonfullerene acceptor, with certified efficiency over 15%. By modifying materials and optimizing morphology, researchers have achieved impressive progress in this area. Small-molecule materials with easily tuned properties will be a key focus for future developments.
Article
Chemistry, Physical
Huanran Feng, Yvjie Dai, Lihao Guo, Di Wang, Hao Dong, Zhihui Liu, Lu Zhang, Yvjin Zhu, Chen Su, Yongsheng Chen, Weiwei Wu
Summary: The ternary strategy is an effective method to improve the power conversion efficiency of organic photovoltaic cells, by introducing a third component to reduce energy loss. The introduction of the simple molecule BR1 has been shown to enhance the performance of PM6:Y6-based OPVs and increase the PCE of the photovoltaic cells.
Article
Materials Science, Multidisciplinary
Xiaohei Wu, Shijie Cai, Kexin Shen, Mingxia Chen, Tao Wang, Xinbi Zhao, Shanshan Wang, Xinrong Yang, Meimei Zhang, Rui Sun, Jie Min
Summary: In this work, a new design strategy was proposed to synthesize a polymerized small molecule acceptor PT-BTP with a double-cable structure, which significantly improved the performance of all-polymer solar cells (all-PSCs). The optimized PM6:PT-BTP all-PSCs achieved a high PCE of 12.13% with low energy loss and non-radiative recombination loss. This study provides a new direction in molecular design for constructing narrow bandgap P(A)s for high-performance all-PSCs.
JOURNAL OF MATERIALS CHEMISTRY C
(2023)
Article
Engineering, Electrical & Electronic
Prateek Gupta, Bhubesh C. Joshi
Summary: The structural, optical and morphological properties of Ni-doped ZnO (NZO) thin films were studied using various techniques including X-ray diffraction, UV-Vis spectroscopy, PL spectroscopy, AFM, FESEM, and FTIR. The results showed that NZO thin films exhibited crystalline structure, high transmittance in the UV-Visible region, and a smaller bandgap compared to pure ZnO films. The AFM and FESEM results confirmed the uniform deposition of NZO and ZnO films, and FTIR analysis indicated a shifting of the Zn-O-Zn band with different Ni concentrations. These findings suggest that NZO thin films grown by PLD technique hold potential for optoelectronic applications.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2023)
Review
Chemistry, Multidisciplinary
Lili Zhang, Dan Deng, Kun Lu, Zhixiang Wei
Summary: This review summarizes the strategies for effective morphology control in all-small-molecule organic solar cells, providing practical insights and guidance for material design and device optimization, and promoting further development in this field.
ADVANCED MATERIALS
(2023)
Article
Multidisciplinary Sciences
Heysol C. Bermudez-Cabrera, Sannie Culbertson, Sammy Barkal, Benjamin Holmes, Max W. Shen, Sophia Zhang, David K. Gifford, Richard Sherwood
Summary: The mutational outcomes of CRISPR-Cas9 editing are predictable and targeted, and the ATM inhibitor KU-60019 has been shown to increase 1-bp insertions at the targeted locus. This small molecule has the potential to improve the efficiency of correction for pathogenic 1-bp deletion variants, adding another dimension to precise genome editing with Cas9 nucleases.
NATURE COMMUNICATIONS
(2021)
Article
Optics
Smita Dey, Asit Kumar Kar
Summary: The optical properties of luminescent PMMA-ZnO nanocomposites are affected by the variation of ZnO concentration, which decreases emission intensity but increases energy transfer efficiency as ZnO concentration increases. The photoluminescence quantum efficiency of the composite with highest emission is 74%.
OPTICS AND LASER TECHNOLOGY
(2021)
Article
Chemistry, Multidisciplinary
Saurav Limbu, Kyung-Bae Park, Jiaying Wu, Hyojung Cha, Sungyoung Yun, Seon-Jeong Lim, Hao Yan, Joel Luke, Gihan Ryu, Chul-Joon Heo, Sunghan Kim, Yong Wan Jin, James R. Durrant, Ji-Seon Kim
Summary: The study identified the critical role of donor molecular structure in organic photodetectors, showing that subtle structural changes in blends can significantly impact optoelectronic performance. These insights provide valuable information for the development of high-performance OPDs and highlight key differences in the design of BHJ blends for OPD and OPV devices.
Article
Green & Sustainable Science & Technology
Sang Hoon Lee, Sangyoon Lee
Summary: This study presents the design of a comb-structured air-gap acceleration sensor and the materials and processes for highly productive roll-to-roll printed electronic fabrication of the sensor. The sensor is designed with multiple layers in two parts, processed separately on different flexible PET substrates, and then transferred and bonded to form an air-gap structure. Electrical characteristics of the sensor are provided by testing capacitance change as a function of acceleration.
INTERNATIONAL JOURNAL OF PRECISION ENGINEERING AND MANUFACTURING-GREEN TECHNOLOGY
(2022)
Article
Nanoscience & Nanotechnology
Hyeong-Ju Kim, In-Sun Jung, Seyoung Jung, Dongmin Kim, Daiki Minami, Sunjung Byun, Taejin Choi, Jisoo Shin, Sungyoung Yun, Chul-Joon Heo, Kyung-Bae Park, Soo Young Park, Seon-Jeong Lim, Hyo Sug Lee, Byoungki Choi
Summary: A novel series of donor-π-acceptor molecules designed with intramolecular chalcogen bonding exhibit excellent optical, thermal, and optoelectronic properties, with advantages in smaller absorption spectral widths, higher absorption coefficients, thermal stabilities, and charge carrier transport properties.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Review
Materials Science, Multidisciplinary
Ning Li, Paramasivam Mahalingavelar, Jarrett H. Vella, Dong-Seok Leem, Jason D. Azoulay, Tse Nga Ng
Summary: This paper introduces infrared photon detectors based on solution-processable semiconductors, highlighting their sensitivity and advantages compared to vacuum-processed counterparts. It also discusses the challenges and recent research directions in the development of solution-processable infrared detectors.
MATERIALS SCIENCE & ENGINEERING R-REPORTS
(2021)
Article
Nanoscience & Nanotechnology
Naotoshi Suganuma, Chul-Joon Heo, Daiki Minami, Sungyoung Yun, Sungjun Park, Younhee Lim, Feifei Fang, Byoungki Choi, Kyung-Bae Park
Summary: Improved photo-response characteristics in organic photodiodes (OPDs) can be achieved by introducing cascade hole transport layers (HTL) to reduce the decay time of remaining charges. When the energy level gaps are close to equal among the layers, cascade HTL can minimize the remaining photocurrent effectively in OPDs.
ADVANCED ELECTRONIC MATERIALS
(2022)
Article
Multidisciplinary Sciences
Gae Hwang Lee, Hyunbum Kang, Jong Won Chung, Yeongjun Lee, Hyunjun Yoo, Sujin Jeong, Hyeon Cho, Joo-Young Kim, Sung-Gyu Kang, Ji Young Jung, Suk Gyu Hahm, Jeahyuck Lee, In-Jo Jeong, Minho Park, Gunkuk Park, In Ho Yun, Justin Younghyun Kim, Yongtaek Hong, Youngjun Yun, Sung-Han Kim, Byoung Ki Choi
Summary: In this study, a polarization-selective structure of a skin-conformable photoplethysmographic (PPG) sensor was developed to reduce motion artifacts. The developed sensor, with two orthogonal polarizers, effectively monitored PPG signals during wrist angle movements corresponding to high levels of physical activity, enabling continuous monitoring of daily activities.
Article
Multidisciplinary Sciences
Chiara Labanti, Jiaying Wu, Jisoo Shin, Saurav Limbu, Sungyoung Yun, Feifei Fang, Song Yi Park, Chul-Joon Heo, Younhee Lim, Taejin Choi, Hyeong-Ju Kim, Hyerim Hong, Byoungki Choi, Kyung-Bae Park, James R. Durrant, Ji-Seon Kim
Summary: This study investigates the light-intensity-dependent photoresponse time of organic photodetectors (OPDs) with two small-molecule donors co-evaporated with C-60 acceptors. The MPTA:C-60 blend shows the fastest response time at high-light intensities, but the slowest response at low-light intensities, potentially due to the presence of deep trap states. The disrupted molecular packing and HOMO level shift caused by C-60 contribute to the energetic inhomogeneity and limit the low-light photoresponse time.
NATURE COMMUNICATIONS
(2022)
Article
Materials Science, Multidisciplinary
Insun Park, Changki Kim, Raesung Kim, Ning Li, Jaejun Lee, Oh Kyu Kwon, Byoungki Choi, Tse Nga Ng, Dong-Seok Leem
Summary: In this study, a newly synthesized copolymer was presented as a high-efficiency organic SWIR photodetector by utilizing organic molecules as sensing materials. The optimization of the molecular structure allowed for high external quantum efficiency and detectivity under low bias voltage, which is significant for potential applications in biometrics, surveillance, and machine vision.
ADVANCED OPTICAL MATERIALS
(2022)
Article
Optics
Sungjun Park, Younhee Lim, Chul-Joon Heo, Sungyoung Yun, Dong-Seok Leem, Sunghan Kim, Byoungki Choi, Kyung-Bae Park
Summary: The demand for high-definition CMOS image sensors has increased in recent years, and this study proposes transparent green-sensitive organic photodetectors (TG-OPDs) for organic-silicon hybrid CMOS image sensors, with high detectivity and responsivity.
Article
Nanoscience & Nanotechnology
Sangyeon Pak, Jiwon Son, Taehun Kim, Jungmoon Lim, John Hong, Younhee Lim, Chul-Joon Heo, Kyung-Bae Park, Yong Wang Jin, Kyung-Ho Park, Yuljae Cho, SeungNam Cha
Summary: A novel iodine gas doping method has been proposed to simultaneously modulate the electrical properties of both 2D MoS2 channel and 2D CuS electrode in a facile and cost-effective manner, allowing for the improvement of the control performance of electronic devices.
Article
Chemistry, Multidisciplinary
Seonghyeon Cho, Chul-Joon Heo, Younhee Lim, Seoyeon Oh, Daiki Minami, Minseok Yu, Hyunchae Chun, Sungyoung Yun, Hwijoung Seo, Feifei Fang, Jeong-Il Park, Cheol Ham, Jisoo Shin, Taejin Choi, Juhyung Lim, Hyeong-Ju Kim, Hye Rim Hong, Hiromasa Shibuya, Jeoungin Yi, Byoungki Choi, Kyung-Bae Park
Summary: This work describes the development of an organic photodiode receiver for high-speed optical wireless communication, achieving a data rate of up to 150 Mbps, which is 40 times faster than the previous fastest record. The OPD receiver also demonstrates significantly higher spectral efficiency compared to previously reported organic photovoltaic receivers.
Article
Chemistry, Multidisciplinary
Hyunbum Kang, Yeongjun Lee, Gae Hwang Lee, Jong Won Chung, Young-Nam Kwon, Joo-Young Kim, Yasutaka Kuzumoto, Sangah Gam, Sung-Gyu Kang, Ji Young Jung, Ajeong Choi, Youngjun Yun
Summary: A stretchable and skin-conformable photodiode (PD) is essential for the development of next-generation wearable electronics. This study demonstrates intrinsically stretchable polymer-based PDs (is-PPDs) with high detectivity and high mechanical stretchability. By using elastomeric photoactive layers and conducting polymer-based stretchable transparent electrodes, is-PPDs exhibit excellent detectivity and stable performance even under large deformation.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Taejin Choi, Juhyung Lim, Daiki Minami, Chul-Joon Heo, Jisoo Shin, Sungyoung Yun, Young Mo Sung, Feifei Fang, Hyerim Hong, Hyeong-Ju Kim, Younhee Lim, Jeoungin Yi, Jeong-Il Park, Cheol Ham, Hiromasa Shibuya, Hwijoung Seo, Soohwan Sul, Byoungki Choi, Kyung-Bae Park
Summary: The development of light-absorbing organic molecules with calculated oscillator strength (f) is important for improving the performance of organic photoelectric devices. However, most devices are composed of organic thin films rather than single molecules. In this study, three novel organic molecules with similar oscillator strengths but different molecular volumes were designed and synthesized. The molecule with the smallest volume and highest packing density showed the highest absorption coefficient and the best performance in organic thin films.
ADVANCED OPTICAL MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Feifei Fang, Daiki Minami, Sungyoung Yun, Chul-Joon Heo, Hiromasa Shibuya, Hyerim Hong, Byoungki Choi, Kyung-Bae Park
Summary: In this study, the influence of axial fluorination of SubPc on the photoresponsivity of OPD devices with bulk heterojunction (BHJ) configurations was explored. The novel surface photovoltage (SPV) analysis combined with air photoemission spectroscopy was used to elucidate the specific roles of rapid decay and intrinsic trap state in accelerating the photoresponsivity of fluorinated SubPc. Furthermore, advanced computational techniques, such as molecular dynamics (MD) and density functional theory (DFT) calculations, provided deeper insights into the underlying mechanisms based on electron hopping rates and energy disordering.
JOURNAL OF MATERIALS CHEMISTRY C
(2022)
