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351.
microcrystalline silicon films have been prepared through mercury photosensitized decomposition of monosilane at low gas pressures. The dark and light conductivities of the silicon films tend to increase at reactant pressures lower than 65 Pa and become 10?2Ω?1· cm?1 at 26 Pa. From the Raman scattering and x-ray diffraction, silicon films were found to consist of a mixed phase structure including both microcrystalline and amorphous regions. 相似文献
352.
Ikurou Umezu Muneyuki Naito Daisuke Kawabe Yusuke Koshiba Katsuki Nagao Akira Sugimura Tamao Aoki Mitsuru Inada Tadashi Saitoh Atsushi Kohno 《Applied Physics A: Materials Science & Processing》2014,117(1):155-159
Hyperdoping with deep-level impurity is a promising method to prepare intermediate band semiconductors. We prepared silicon hyperdoped with deep-level impurities, sulfur and titanium, by ion implantation followed by pulsed YAG laser melting. The processes of sulfur and titanium hyperdoping are comparatively studied. The amorphous sulfur and titanium ion-implanted layers changed to monocrystal by following pulsed laser melting. The depth profile of sulfur impurity after pulsed laser melting is similar to that of ion-implanted sample, while large segregation is observed for titanium hyperdoping. The crystallinity and degree of segregation depend on the laser shot number and initially implanted titanium dose. There is a trade-off between crystallinity and depth profile of impurity for titanium hyperdoping. From a viewpoint material processing, formation of high-quality silicon monocrystal hyperdoped with sulfur is easier than that with titanium. Correlation between the mid-infrared optical absorption and photoconductivity is also discussed for sulfur-hyperdoped sample. 相似文献
353.
Iwasawa H Douglas JF Sato K Masui T Yoshida Y Sun Z Eisaki H Bando H Ino A Arita M Shimada K Namatame H Taniguchi M Tajima S Uchida S Saitoh T Dessau DS Aiura Y 《Physical review letters》2008,101(15):157005
Angle-resolved photoemission spectroscopy with low-energy tunable photons along the nodal direction of oxygen isotope substituted Bi(2)Sr(2)CaCu(2)O(8+delta) reveals a distinct oxygen isotope shift near the electron-boson coupling "kink" in the electronic dispersion. The magnitude (a few meV) and direction of the kink shift are as expected due to the measured isotopic shift of phonon frequency, and are also in agreement with theoretical expectations. This demonstrates the participation of the phonons as dominant players, as well as pinpointing the most relevant of the phonon branches. 相似文献
354.
Naoya Ieda Masato Sawada Runa Oguchi Masato Itoh Seina Hirakata Daisuke Saitoh Akito Nakao Mitsuyasu Kawaguchi Prof. Kazunobu Sawamoto Prof. Toshitada Yoshihara Prof. Yasuo Mori Prof. Hidehiko Nakagawa 《Angewandte Chemie (International ed. in English)》2023,62(20):e202217585
We present an optochemical O2 scavenging system that enables precise spatiotemporal control of the level of hypoxia in living cells simply by adjusting the light intensity in the illuminated region. The system employs rhodamine containing a selenium or tellurium atom as an optochemical oxygen scavenger that rapidly consumes O2 by photochemical reaction with glutathione as a coreductant upon visible light irradiation (560–590 nm) and has a rapid response time, within a few minutes. The glutathione-consuming quantum yields of the system were calculated as about 5 %. The spatiotemporal O2 consuming in cultured cells was visualized with a hypoxia-responsive fluorescence probe, MAR. Phosphorescence lifetime imaging was applied to confirmed that different light intensities could generate different levels of hypoxia. To illustrate the potential utility of this system for hypoxia research, we show that it can spatiotemporally control calcium ion (Ca2+) influx into HEK293T cells expressing the hypoxia-responsive Ca2+ channel TRPA1. 相似文献
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