Article
Physics, Applied
Kohei Watanabe, Shigeo Asahi, Yaxing Zhu, Takashi Kita
Summary: The modulation doping technique allows for control of the efficiency of the photoabsorption process in TPU solar cells. The upconversion process induced by infrared light can significantly increase the external quantum efficiency and contribute to the boost in open-circuit voltage.
JOURNAL OF APPLIED PHYSICS
(2021)
Article
Energy & Fuels
Jakapan Chantana, Yu Kawano, Takahito Nishimura, Abdurashid Mavlonov, Takashi Minemoto
Summary: The study calculates the detailed balance limit for bifacial two-terminal tandem solar cells, revealing optimized bandgaps for matching photogenerated current densities of two subcells to maximize output power. Additionally, it is found that the current mismatching in monofacial solar cells can be solved by suitable (Front Irr + Back Irr)/Front Irr ratios.
Article
Physics, Applied
Maxime Giteau, Samy Almosni, Jean-Francois Guillemoles
Summary: Conventional single-junction solar cells have a limit of 33% in theoretical efficiency, and only multi-junction solar cells can overcome this limit. Hot-carrier solar cells, another high-efficiency approach, have been hindered by the difficulty of mitigating carriers' thermalization. This letter introduces the concept of hot-carrier multi-junction solar cells and compares the efficiency of different devices based on various parameters.
APPLIED PHYSICS LETTERS
(2022)
Article
Chemistry, Physical
Zhuang Qian, Jian Zhou, Hua Wang, Shi Liu
Summary: A bulk material without inversion symmetry can generate a direct current under illumination, known as the bulk photovoltaic effect (BPVE), which does not rely on p-n junctions. In this study, we investigate the shift current generation, a major mechanism responsible for BPVE, in single-element two-dimensional (2D) ferroelectrics such as As, Sb, and Bi. These elemental 2D materials exhibit strong covalency, small band gap, and large joint density of states, resulting in significant shift currents that outperform state-of-the-art materials. We find that the shift current is sensitive to the details of the Bloch wave functions due to its topological nature, and reliable frequency-dependent shift current responses require consideration of the electronic exchange-correlation potential beyond the generalized gradient approximation as well as the spin-orbit interaction in density functional theory calculations.
NPJ COMPUTATIONAL MATERIALS
(2023)
Article
Chemistry, Physical
Juan Bisquert
Summary: The photovoltage of high-performance solar cells like GaAs and metal halide perovskites is affected by the exponential Urbach tail in the absorption spectrum, with a parameter E-U. Increasing Urbach energy leads to a decrease in the maximum achievable photovoltage. A calculation based on the detailed balance and reciprocity of absorption and emission shows that the voltage loss due to the exponential tail in absorption follows a universal relation.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2021)
Article
Engineering, Electrical & Electronic
Jakapan Chantana, Kota Takeguchi, Abdurashid Mavlonov, Yu Kawano, Takashi Minemoto
Summary: This study estimates the detailed balance limits of perovskite/Si tandem solar cells based on various environmental factors. The contour maps of conversion efficiency as functions of top bandgap and environmental factors are revealed.
MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
(2022)
Article
Materials Science, Multidisciplinary
Durgesh Kumar, Dharmendra Kumar Dheer, Lawrence Kumar
Summary: This study conducted a theoretical analysis of series-connected triple-junction solar cells based on the detailed balance limit, evaluating the impact of different operating conditions on conversion efficiency through numerical modeling. It was found that the efficiency is highly sensitive to spectrum distribution and temperature, with appropriate bandgap combinations and solar concentration ratios significantly improving efficiency. The research suggests that the optimization of bandgap and solar concentration could be an effective approach to enhance conversion efficiency in solar cells.
MATERIALS RESEARCH EXPRESS
(2021)
Article
Optics
Lin Zhu, Yongtao Wang, Xu Pan, Hidefumi Akiyama
Summary: This study presents a formula for absorptance of all subcells in an N-junction solar cell with ideal front texture and perfect rear mirror, which is then applied to InGaP/GaAs/InGaAs triple-junction solar cells. The results show that front-textured triple-junction solar cells can significantly enhance light absorption, with the top subcell thickness reduced by over 28%. Additionally, front texturization has greater potential for material cut-down compared to rear texturization.
Article
Materials Science, Multidisciplinary
Verena Neder, Stefan W. Tabernig, Albert Polman
Summary: This study investigates the efficiency limit enhancement of perovskite/silicon tandem solar cells using a spectrum splitter. The results show that the spectrum splitter technique can significantly improve the efficiency, especially for large bandgap top cells. Lambertian spectral splitter exhibits better performance compared to planar splitter. With the consideration of experimental losses and nonunity reflection, the integration of a spectral splitter into the tandem cells can lead to a large increase in efficiency.
JOURNAL OF PHOTONICS FOR ENERGY
(2022)
Article
Multidisciplinary Sciences
Jaya Madan, Karanveer Singh, Rahul Pandey
Summary: Tandem solar cells, especially perovskite/silicon tandems, have significantly impacted the photovoltaic landscape by efficiently utilizing the solar spectrum, but challenges such as the low absorption coefficient and high cost of silicon remain. This study presents a 23.36% efficient two-terminal perovskite-PbS CQD monolithic tandem solar cell design, aiming to mitigate losses and reduce costs through comprehensive device simulations.
SCIENTIFIC REPORTS
(2021)
Article
Energy & Fuels
Zhenxiao Shang, Zhen Yang, Yanfei Ma
Summary: Using waste biomass to produce high-value activated carbon is crucial for biomass resource utilization. The energy and mass balance during carbonization and steam activation is important for the system operation. Control of activation temperature and steam/bio-char ratio is essential for the activation process.
BIOMASS CONVERSION AND BIOREFINERY
(2021)
Article
Engineering, Electrical & Electronic
Raghvendra, Rashmi Ranjan Kumar, Saurabh Kumar Pandey
Summary: This study discusses a simulation model for a tandem solar cell with perovskite material-based top and bottom subcells. The effects of defect density, thickness, and contact work function on the overall efficiency of the solar cell were analyzed. By matching the short-circuit currents of the subcells, the efficiency of the tandem solar cell was improved by 20%.
JOURNAL OF ELECTRONIC MATERIALS
(2022)
Article
Automation & Control Systems
Kaiyi Ji, Junjie Yang, Yingbin Liang
Summary: This paper introduces a new theoretical framework to provide convergence guarantees for two types of objective functions for the MAML algorithm, for both resampling and finite-sum cases. The results suggest that for N-step MAML, the inner-stage stepsize needs to be inversely proportional to the number of inner-stage steps chosen.
JOURNAL OF MACHINE LEARNING RESEARCH
(2022)
Article
Engineering, Electrical & Electronic
M. Eskandari, G. Rostami, M. Dolatyari, A. Rostami, H. Heidarzadeh
Summary: The paper provides theoretical evaluation and a framework for the maximum power conversion efficiency limit for multiband solar cells using genetic algorithm (GA) optimization techniques. The calculations show maximum efficiency of 62.9% and 70.3% for three and four band solar cells respectively. The algorithm development enables the design and proposal of novel and appropriate materials for photovoltaic structures to achieve maximum power conversion efficiency, paving the way for further research in the synthesis of new materials.
OPTICAL AND QUANTUM ELECTRONICS
(2021)
Article
Engineering, Multidisciplinary
Timothy C. A. Molteno
Summary: This paper describes a method to experimentally measure the power coefficient, C-p, of winged seeds, and applies this technique to seeds from the Norway maple. The results show that these seeds, operating in low-Reynolds number conditions, approach the Betz limit, which is the maximum possible efficiency for a wind turbine. However, this result contradicts with the recent theoretical work.
Article
Materials Science, Multidisciplinary
Ghada H. Dushaq, Mahmoud S. Rasras, Ammar M. Nayfeh
MATERIALS RESEARCH BULLETIN
(2017)
Correction
Energy & Fuels
Kazi Islam, Farsad Imtiaz Chowdhury, Ali Kemal Okyay, Ammar Nayfeh
Article
Physics, Condensed Matter
Ghada Dushaq, Ammar Nayfeh, Mahmoud Rasras
SUPERLATTICES AND MICROSTRUCTURES
(2017)
Article
Materials Science, Multidisciplinary
Ghada Dushaq, Mahmoud Rasras, Ammar Nayfeh
Article
Engineering, Electrical & Electronic
Bei Liu, Mengda Mao, Devrishi Khanna, Chirn-Chye Boon, Pilsoon Choi, Eugene A. Fitzgerald
IEEE MICROWAVE AND WIRELESS COMPONENTS LETTERS
(2018)
Article
Engineering, Electrical & Electronic
Bei Liu, Mengda Mao, Devrishi Khanna, Pilsoon Choi, Chirn Chye Boon, Eugene A. Fitzgerald
IEEE MICROWAVE AND WIRELESS COMPONENTS LETTERS
(2018)
Article
Engineering, Electrical & Electronic
Bei Liu, Mengda Mao, Chirn Chye Boon, Pilsoon Choi, Devrishi Khanna, Eugene A. Fitzgerald
IEEE MICROWAVE AND WIRELESS COMPONENTS LETTERS
(2018)
Article
Physics, Applied
Kwang Hong Lee, Shuyu Bao, Yue Wang, Eugene A. Fitzgerald, Chuan Seng Tan
JOURNAL OF APPLIED PHYSICS
(2018)
Article
Green & Sustainable Science & Technology
Sabina Abdul Hadi, Eugene A. Fitzgerald, Steven Griffiths, Ammar Nayfeh
JOURNAL OF RENEWABLE AND SUSTAINABLE ENERGY
(2018)
Article
Engineering, Electrical & Electronic
Kwang Hong Lee, Yue Wang, Bing Wang, Li Zhang, Wardhana Aji Sasangka, Shuh Chin Goh, Shuyu Bao, Kenneth E. Lee, Eugene A. Fitzgerald, Chuan Seng Tan
IEEE JOURNAL OF THE ELECTRON DEVICES SOCIETY
(2018)
Article
Multidisciplinary Sciences
Sabina Abdul Hadi, Khaled M. Humood, Maguy Abi Jaoude, Heba Abunahla, Hamda Faisal Al Shehhi, Baker Mohammad
SCIENTIFIC REPORTS
(2019)
Article
Multidisciplinary Sciences
Heba Abunahla, Baker Mohammad, Anas Alazzam, Maguyabi Jaoude, Mahmoud Al-Qutayri, Sabina Abdul Hadi, Said F. Al-Sarawi
SCIENTIFIC REPORTS
(2019)
Article
Engineering, Electrical & Electronic
Loke Wan Khai, Ng Geok Ing, Eugene A. Fitzgerald, Yoon Soon Fatt, Wang Yue, Lee Kwang Hong, Liu Zhihong, Xie Hanlin, Chiah Siau Ben, Kenneth Lee Eng Kian, Zhou Xing, Chuan Seng Tan
IEEE JOURNAL OF THE ELECTRON DEVICES SOCIETY
(2020)
Proceedings Paper
Engineering, Electrical & Electronic
Khaled Humood, Sabina Abdul Hadi, Baker Mohammad, Maguy Abi Jaoude, Anas Alazzam, Mohammad Alhawari
31ST INTERNATIONAL CONFERENCE ON MICROELECTRONICS (IEEE ICM 2019)
(2019)
