Article
Nanoscience & Nanotechnology
Vikash Kumar, Renu Gupta, Ajay Bansal
Summary: The impact of hydrothermal growth time on the synthesis of zinc oxide nanorods was studied, and the optimal growth time was identified as 9 hours. The addition of a passivating layer of titanium dioxide significantly increased the efficiency of dye-sensitized solar cells.
ACS APPLIED NANO MATERIALS
(2021)
Article
Chemistry, Multidisciplinary
Kang-Hun Lee, Seung-Hee Han, Ana Chuquer, Hwa-Young Yang, Jaehi Kim, Xuan-Hung Pham, Won-Ju Yun, Bong-Hyun Jun, Won-Yeop Rho
Summary: This study investigates the change in power conversion efficiency (PCE) of DSSCs by introducing Au nanoparticles (Au NPs) and a scattering layer. It was found that Au NPs enhance electron generation and the scattering layer improves light harvesting, resulting in a significant increase in the PCE of DSSCs. synergistically, the combination of Au NPs and a scattering layer shows promising potential for enhancing electron generation and light harvesting abilities in DSSCs.
Article
Environmental Sciences
Muhammad Umair Shahid, Norani Muti Mohamed, Ali Samer Muhsan, Siti Nur Azella Zaine, Mehboob Khatani, Asfand Yar, Waqar Ahmad, Muhammad Babar Hussain, Asma A. Alothman, Mohammed Sheikh Saleh Mushab
Summary: Dye-sensitized solar cells (DSSCs) have attracted attention for their low-cost processing, ability to work in diffuse light, and potential for building integrated photovoltaics (BIPV). However, their efficiency is low due to multiple issues. This study introduces a graphene/TiO2 scattering layer that enhances electron transport and light scattering. Results show that with 0.01 wt% graphene, a 33% higher photoconversion efficiency (PCE) was achieved compared to without scattering layer. However, PCE decreases at >0.01 wt% graphene due to loss of diffuse reflectance and higher optical absorption.
Article
Chemistry, Multidisciplinary
S. Athithya, S. Harish, H. Ikeda, M. Navaneethan, J. Archana
Summary: In this study, a new scheme consisting of ZnO nanospindles decorated on TiO2 mesospheres as a stable photoanode was reported, and the kinetics of photon-induced charge carrier migration/transfer were explored. Different proportions of ZnO spindles decorated on mesosphere TiO2 were synthesized and used as photoanodes in DSSCs. The DSSC device with the TZC-0.05 photoanode showed excellent photovoltaic performance and long-term stability, with the best response exhibited at 35 degrees Celsius.
Article
Materials Science, Multidisciplinary
Muhammad Sufyan, Umer Mehmood, Yasir Qayyum Gill, Rabia Nazar, Anwar Ul Haq Khan
Summary: In this study, ZnO nanorods were synthesized via the hydrothermal method and characterized by SEM and XRD. The results show that hydrothermal temperature affects the morphology of nanorods, which in turn influences the photovoltaic performance of devices. The device fabricated with ZnO nanorods photoanode synthesized at 120 degrees C achieved an efficiency of 2.08%, surpassing conventional ZnO nanoparticles-based DSSC with an efficiency of 1.19%.
Article
Engineering, Electrical & Electronic
B. Vasanth, R. Govindaraj, P. Ramasamy
Summary: Mesoporous TiO2 microspheres with better crystallinity and larger surface area were successfully synthesized using a microwave-assisted hydrothermal technique. The TiO2 microspheres-based device exhibited higher power conversion efficiency due to its strong light-scattering ability and excellent dye loading capacity.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2022)
Article
Green & Sustainable Science & Technology
M. Shobana, P. Balraju, P. Senthil Kumar, N. Muthukumarasamy, R. Yuvakkumar, Dhayalan Velauthapillai
Summary: In this study, the photoanodes in dye-sensitized solar cells were improved by using two different morphologies, one-dimensional hydrothermally synthesized rutile nanorods and nanoparticles of TiO2, to increase the short circuit current density of the device. The combination of both structures resulted in high Jsc by providing a better pathway for electron transportation and efficient light absorption. The crystalline nature of the synthesized bilayer film was confirmed, and UV-Vis and photoluminescence spectroscopy were used to study the absorption and emission properties of the samples. The solar cells with the nanorods/nanoparticles bilayer showed the highest efficiency.
SUSTAINABLE ENERGY TECHNOLOGIES AND ASSESSMENTS
(2022)
Article
Chemistry, Physical
Mahmoud Hezam, Mohammed Qasi Alsubaie, Ahmad Algarni, Hamid Ghaithan, Joselito Labis, Mohammad Alduraibi
Summary: This study demonstrates the tuning of ZnO nanosheet-nanowire morphology by adjusting the NaOH concentration in a low-temperature chemical bath, resulting in a variety of nano/microstructures with different sizes and aspect ratios. Photoluminescence spectra were mainly influenced by violet emission from Zn interstitial related defects formed during growth. In dye-sensitized solar cells, ZnO nanosheets with a thickness of 30-40 nm exhibited superior performance in terms of J-V characteristics and transport dynamics.
CHEMICAL PHYSICS LETTERS
(2021)
Article
Chemistry, Physical
Satish A. Mahadik, Hemraj M. Yadav, Sarika S. Mahadik
Summary: By tuning surface polarity and sensitizing TiO2 nanorods with chlorophyll-a dye, improvements in DSSCs have been achieved. Various surface properties such as superhydrophobicity and reduction in oxygen defects were successfully explored. The sensitized system showed a 3.69 times improvement in PEC under 1000 W light illumination.
COLLOID AND INTERFACE SCIENCE COMMUNICATIONS
(2022)
Article
Engineering, Electrical & Electronic
Z. K. Yildiz, S. Erel
Summary: In this study, a hybrid photoanode-based dye-sensitized solar cell (DSSC) was designed, which showed improved performance due to the modified mesoporous layer of nanoparticles and nanorods.
JOURNAL OF ELECTRONIC MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
N. Mohsenzadegan, E. Nouri, M. R. Mohammadi
Summary: The improvement of photoconversion efficiency and operational stability of dye-sensitized solar cells (DSSCs) under environmental conditions is a major challenge for commercialization. Two approaches, namely increasing light scattering via embedding mesoporous TiO2 beads and delaying electrolyte leakage using gel polymer electrolyte, were employed to address this challenge. The highest photoconversion efficiency of 9.8% was achieved for the photoanode based on mesoporous TiO2 beads in the presence of gel polymer electrolyte, demonstrating longer operational stability under realistic ambient conditions.
Article
Engineering, Electrical & Electronic
Mehdi Ismail, Celine Olivier, Thierry Toupance
Summary: Anatase TiO2 photoanodes were modified with hydrothermally synthesized WO3 nanorods for DSSC applications. Two configurations were investigated, where the addition of WO3 nanorods in the TiO2 matrix showed better performance for front illumination, while the undercoat of WO3 nanorods on FTO substrate showed better performance for back illumination. The excellent electron mobility and specific nanorod shape of WO3 contributed to charge trapping and injection, reducing recombination and dark current, while the scattering nature of the WO3 nanorods undercoat was beneficial for light harvesting.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2023)
Article
Energy & Fuels
Yongjian Jiang, Fengyang Zhao
Summary: A novel bunchy TiO2 hierarchical microspheres composite nanostructure with strings of anatase TiO2 hierarchical micro-spheres and rutile nanobelts framework was synthesized, demonstrating great improvement in power conversion efficiency in dye sensitized solar cells due to efficient scattering centers.
FRONTIERS IN ENERGY RESEARCH
(2021)
Article
Materials Science, Multidisciplinary
Fengjuan Miao, Fuchen Chu, Bingcheng Sun, Bairui Tao, Peng Zhang, Yu Zang, Paul K. Chu
Summary: This study presents the design and fabrication of a photoanode composed of Au/SnS/TiO2 sensitized with natural dye for dye-sensitized solar cells (DSSCs). By calcination, a layer of spherical nano-TiO2 is prepared, and a layer of nano-SnS is deposited on the TiO2 photoanode using the continuous ion layer adsorption reaction (SILAR). The sensitized Au nanoparticles exhibit enhanced localized surface plasmon resonance (LSPR) effects and electron trapping ability, resulting in improved electron mobility and reduced electron recombination in the DSSC.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2022)
Article
Chemistry, Physical
N. Sriharan, T. S. Senthil, P. Soundarrajan, Misook Kang
Summary: TiO2 nanorods were synthesized from colloidal titanate using a hydrothermal method, and Mg metallic ions were doped to study their influence on the growth of TiO2 nanorods. The introduction of Mg dopant induced constraint stress in the nanorods, resulting in a shift in preferentially oriented crystallographic plane. The crystallographic structures of TiO2 nanorods remained unchanged, but the surface to volume ratio and absorption capacity shifted due to Mg doping. This physical property change was confirmed by EDS analysis. The doped TiO2 nanorods showed improved performance as photoelectrodes in dye-sensitized solar cells, with the 2 mol.% Mg doped TiO2 nanorods achieving a high power conversion efficiency of 6.36%.
APPLIED SURFACE SCIENCE
(2022)
Article
Chemistry, Analytical
Da Hoon Lee, Sun Kil Kang, Yusin Pak, Namsoo Lim, Ryeri Lee, Yogeenth Kumaresan, Sungeun Lee, Chaedeok Lee, Moon-Ho Ham, Gun Young Jung
SENSORS AND ACTUATORS B-CHEMICAL
(2018)
Article
Chemistry, Multidisciplinary
Namsoo Lim, Tae Jin Yoo, Jin Tae Kim, Yusin Pak, Yogeenth Kumaresan, Hyeonghun Kim, Woochul Kim, Byoung Hun Lee, Gun Young Jung
Article
Chemistry, Multidisciplinary
Yusin Pak, Yeonggyo Jeong, Naresh Alaal, Hyeonghun Kim, Jeonghoon Chae, Jung-Wook Min, Assa Aravindh Sasikala Devi, Somak Mitra, Da Hoon Lee, Yogeenth Kumaresan, Woojin Park, Tae-Wook Kim, Iman S. Roqan, Gun-Young Jung
ADVANCED MATERIALS INTERFACES
(2019)
Article
Chemistry, Multidisciplinary
Namsoo Lim, Yusin Pak, Jae-Keun Kim, Tae Jin Yoo, Hyeonghun Kim, Yogeenth Kumaresan, Woochul Kim, Seongjun Cho, Sooncheol Kwon, Byoung Hun Lee, Takhee Lee, Gun-Young Jung
Article
Chemistry, Physical
Huisu Jeong, Sung-Jin Lim, Srinath Chakravarthy, Kyoung Hwan Kim, Junhyeong Lee, Jin S. Heo, Hwiyeol Park
JOURNAL OF POWER SOURCES
(2020)
Article
Nanoscience & Nanotechnology
Yogeenth Kumaresan, Hyeonghun Kim, Yusin Pak, Praveen Kumar Poola, Ryeri Lee, Namsoo Lim, Heung Cho Ko, Gun Young Jung, Ravinder Dahiya
ADVANCED ELECTRONIC MATERIALS
(2020)
Review
Nanoscience & Nanotechnology
Abhishek Singh Dahiya, Dhayalan Shakthivel, Yogeenth Kumaresan, Ayoub Zumeit, Adamos Christou, Ravinder Dahiya
Article
Engineering, Electrical & Electronic
Yogeenth Kumaresan, Sihang Ma, Ravinder Dahiya
Summary: The study introduces a new method based on a PMMA sacrificial layer, which can reduce the stress on UTCs and reliably separate them from the substrate. Compared to traditional methods, this approach offers high reliability and lower cost.
MICROELECTRONIC ENGINEERING
(2021)
Article
Materials Science, Multidisciplinary
Yogeenth Kumaresan, Guanbo Min, Abhishek Singh Dahiya, Ammara Ejaz, Dhayalan Shakthivel, Ravinder Dahiya
Summary: A self-powered stretchable UV photodetector, developed with kirigami-inspired honeycomb-patterned zinc oxide nanowires and coupled with a triboelectric nanogenerator, demonstrates unprecedented stretchability and high performance. This innovative approach has great potential for real-time UV radiation monitoring using wearable healthcare technology.
ADVANCED MATERIALS TECHNOLOGIES
(2022)
Article
Engineering, Electrical & Electronic
Yogeenth Kumaresan, Sihang Ma, Oliver Ozioko, Ravinder Dahiya
Summary: In this study, an innovative approach was proposed to achieve a highly sensitive capacitive pressure sensor by introducing a zinc oxide nanowire interlayer in the conventional metal-insulator-metal architecture. The zinc oxide nanowire interlayer significantly enhanced the performance of the sensor, resulting in a 7-fold increase in sensitivity at a low-pressure range. The improvement in sensitivity was attributed to enhanced charge separation and electric dipole generation due to the displacement of zinc and oxygen atoms under applied pressure.
IEEE SENSORS JOURNAL
(2022)
Article
Engineering, Electrical & Electronic
Sihang Ma, Yogeenth Kumaresan, Abhishek Singh Dahiya, Leandro Lorenzelli, Ravinder S. Dahiya
Summary: This paper presents a flexible tactile sensing system based on ultrathin chips for dynamic contact pressure measurement. The system exhibits high sensitivity and has potential applications in minimal invasive surgical instruments.
IEEE SENSORS JOURNAL
(2023)
Article
Engineering, Electrical & Electronic
Yogeenth Kumaresan, Oliver Ozioko, Ravinder Dahiya
Summary: This paper introduces a multifunctional electronic skin with a stack of pressure and temperature sensors arrays, achieving high sensitivity sensors under different pressure and temperature conditions through the development of pressure and temperature sensors using different materials and combinations. The developed e-Skin shows great potential for use in robotics and touch-based interactive systems.
IEEE SENSORS JOURNAL
(2021)
Article
Nanoscience & Nanotechnology
Sihang Ma, Yogeenth Kumaresan, Abhishek Singh Dahiya, Ravinder Dahiya
Summary: Heterogeneous integration is a promising approach for combining printed electronics and silicon technology in high-performance hybrid flexible electronics. A non-contact printing method is demonstrated here as an easy and cost-effective way to access UTCs on flexible foils. The research shows that a small increase in electrical resistance from printed interconnects can lead to an acceptable level of variation in device mobility of MOSFETs. The bonded UTCs exhibit robust device performance under bending conditions, indicating high reliability in both chip thinning and bonding methods.
ADVANCED ELECTRONIC MATERIALS
(2022)
Article
Engineering, Electrical & Electronic
Yusin Pak, Woojin Park, Naresh Alaal, Yogeenth Kumaresan, S. Assa Aravindh, Somak Mitra, Bin Xin, Jung-Wook Min, Hyeonghun Kim, Namsoo Lim, Byungjin Cho, Gun-Young Jung, Muhammad M. Hussain, Iman S. Roqan
ACS APPLIED ELECTRONIC MATERIALS
(2020)
Article
Chemistry, Multidisciplinary
Hyeonghun Kim, Woochul Kim, Jiyoon Park, Namsoo Lim, Ryeri Lee, Sung Jun Cho, Yogeenth Kumaresan, Myoung-Kyu Oh, Gun Young Jung
