Searched for:
(1 - 11 of 11)
document
Santbergen, R. (author), Uzu, Hisashi (author), Yamamoto, Kenji (author), Zeman, M. (author)
We use simulations to optimize perovskite/silicon tandem solar cells in a novel three-terminal configuration, with one terminal at the front and two at the rear. We consider configurations in which the top cell has either the inverted or the same polarity as the bottom cell. Our goal is to minimize the optical losses, to compare the...
journal article 2019
document
Correa, Alexandre (author), Mompeán, Federico (author), Guillamón, Isabel (author), Herrera, Edwin (author), García-Hernández, Mar (author), Yamamoto, T. (author), Kashiwagi, Takanari (author), Kadowaki, Kazuo (author), Buzdin, Alexander I. (author)
Many practical applications of high T<sub>c</sub> superconductors involve layered materials and magnetic fields applied on an arbitrary direction with respect to the layers. When the anisotropy is very large, Cooper pair currents can circulate either within or perpendicular to the layers. Thus, tilted magnetic fields lead to intertwined...
journal article 2019
document
Delfanazari, Kaveh (author), Klemm, Richard A. (author), Tsujimoto, Manabu (author), Cerkoney, Daniel P. (author), Yamamoto, T. (author), Kashiwagi, Takanari (author), Kadowaki, Kazuo (author)
We discuss the cavity modes and radiation pattern in solid state terahertz (THz) sources based on layered high-temperature superconducting Bi <sub>2</sub> Sr <sub>2</sub> CaCu <sub>2</sub> O <sub>8+δ</sub> (Bi-2212). We experimentally measure the emission spectra using the Fourier transform infrared spectrometer in order to elucidate the...
journal article 2019
document
Shibano, Yuuki (author), Kashiwagi, Takanari (author), Komori, Yuki (author), Sakamoto, Kazuki (author), Tanabe, Yuki (author), Yamamoto, T. (author), Minami, Hidetoshi (author), Klemm, Richard A. (author), Kadowaki, Kazuo (author)
We studied the etching of small crystals of the high-T<sub>c</sub> superconductor Bi<sub>2</sub>Sr<sub>2</sub>CaCu<sub>2</sub>O<sub>8+δ</sub> (Bi2212) with various dilute compositions of hydrochloric and nitric acids. A particular mixture of those acids was chosen to simultaneously fabricate multiple rectangular stand-alone Bi2212 mesa...
journal article 2019
document
Kashiwagi, Takanari (author), Yuasa, Takumi (author), Tanabe, Yuki (author), Imai, Takayuki (author), Kuwano, Genki (author), Ota, Ryusei (author), Nakamura, Kento (author), Ono, Yukino (author), Kaneko, Youta (author), Tsujimoto, Manabu (author), Minami, Hidetoshi (author), Yamamoto, T. (author), Klemm, Richard A. (author), Kadowaki, Kazuo (author)
Using our recent design of thermally managed sandwich device structures, we studied the radiation frequency characteristics of three such devices of the same rectangular dimensions made from the same single crystal of the high-T<sub>c</sub> superconductor Bi<sub>2</sub>Sr<sub>2</sub>CaCu<sub>2</sub>O<sub>8+</sub> <sub>δ</sub>, and all three...
journal article 2018
document
Santbergen, R. (author), Meguro, Tomomi (author), Suezaki, Takashi (author), Koizumi, Gensuke (author), Yamamoto, Kenji (author), Zeman, M. (author)
We present a new version of our optical model for solar cell simulation: GenPro4. Its working principles are briefly explained. The model is suitable for quickly and accurately simulating a wide range of wafer-based and thin-film solar cells. Especially adjusting layer thicknesses to match the currents in multijunction devices can be done...
journal article 2017
document
Santbergen, R. (author), Mishima, Ryoto (author), Meguro, Tomomi (author), Hino, Masashi (author), Uzu, Hisashi (author), Blanker, A.J. (author), Yamamoto, Kenji (author), Zeman, M. (author)
In a monolithic perovskite/c-Si tandem device, the perovskite top cell has to be deposited onto a flat c-Si bottom cell without anti-reflective front side texture, to avoid fabrication issues. We use optical simulations to analyze the reflection losses that this induces. We then systematically minimize these losses by introducing surface...
journal article 2016
document
McCaskey, A. (author), Yamamoto, Y. (author), Warnock, M. (author), Burzuri, E. (author), Van der Zant, H.S.J. (author), Park, K. (author)
We investigate how the electron-vibron coupling influences electron transport via an anisotropic magnetic molecule, such as a single-molecule magnet (SMM) Fe4, by using a model Hamiltonian with parameter values obtained from density-functional theory (DFT). The magnetic anisotropy parameters, vibrational energies, and electron-vibron coupling...
journal article 2015
document
Liu, H. (author), Yamamoto, M. (author), Tulasi Ram, S. (author), Tsugawa, T. (author), Otsuka, Y. (author), Stolle, C. (author), Doornbos, E. (author), Yumoto, K. (author), Nagatsuma, T. (author)
Using ground observations of total electron content (TEC) and equatorial electrojet (EEJ) in the Asian sector, along with plasma and neutral densities obtained from the CHAMP satellite, we investigate the ionospheric electrodynamics and neutral background in this longitude sector during the major stratospheric sudden warming (SSW) in January...
journal article 2011
document
Liu, H. (author), Doornbos, E.N. (author), Yamamoto, M. (author), Ram, S.T. (author)
Thermospheric density simultaneously observed by the CHAMP and GRACE satellites in both the pre?dawn and afternoon local time sectors undergoes significant decrease across both hemispheres during the major stratospheric sudden warming (SSW) in January 2009. This decrease is largest in the equatorial region near the subsolar latitude, reaching ...
journal article 2011
document
Ishikawa, M. (author), Nakajima, K. (author), Yanagi, M. (author), Yamamoto, Y. (author), Yamasato, K. (author)
journal article 2003
Searched for:
(1 - 11 of 11)